EN AW-5754 · AlMg3 · W.Nr. 3.3535 · UNS A95754 · Per EN 573-3: Mg 2.6-3.6 % – Mn max 0.50 % – Cr max 0.30 % – Si max 0.40 % – Fe max 0.40 % – Cu max 0.10 % – Zn max 0.20 % – Ti max 0.15 % – Mn+Cr 0.10-0.60 % – balance Al. This is a 5xxx series Al-Mg alloy and it is NOT HEAT-TREATABLE. Its strength comes from magnesium in solid solution and from COLD WORK (H tempers). There is NO solution treatment, quench and ageing cycle; tempers such as T4 / T5 / T6 / T651 are NOT DEFINED for this alloy. The tempers are O, H111, H112, H114 and the H12/H22/H32 · H14/H24/H34 · H16/H26/H36 families.
Bought for welded, formed sheet and plate work that must survive seawater and industrially polluted atmospheres and that will not be heat treated: ship and boat structures, vehicle bodies, tanks and vessels, treadplate flooring, food processing equipment, welded chemical and nuclear plant…
Forms
Round bar · flat bar · plate · sheet · tube · forgings. All forms are supplied to order.
Standards
EN 573-3 (chemical composition) · EN 573-1 and EN 573-2 (designation) · EN 515 (temper designations) · EN 485-1 (inspection) · EN 485-2 (mechanical properties of flat products) · EN 485-3 and EN 485-4 (tolerances) · EN 755-1/-2 (extruded rod, bar, tube and profiles) · EN 754-1/-2 (cold drawn rod, bar and tube) · EN 586-1/-2/-3 (forgings) · EN 1386 (tread plate) · EN 13195 (marine applications) · DIN EN 602 (food contact) NO VERIFIED AMS NUMBER WAS FOUND for this alloy. 5754 is a European alloy and does not appear in the aerospace specification systems. In North America its functional counterpart is 5052 and the ASTM specifications largely run through 5052;
Advantage
This alloy has the best weldability and the best cold formability of the five, and it gets them without giving up seawater resistance. The Aalco, thyssenkrupp and Smith Metal data sheets rate gas, arc and resistance welding as very good; Gleich gives TIG/MIG/EB its top mark (1).
Welding
Filler metal SG-AlMg3 and SG-AlMg5 (BIKAR); 5356 and 5183 are also used in general practice. Gas, arc (TIG/MIG), resistance and electron beam welding are suitable; BRAZING IS POOR (Aalco: brazability poor). PREHEAT in the sense used for steel is not applied to aluminium;
Limits
The first limit is STRENGTH: the EN 485-2 minima are clearly below 5083 (130 MPa in H22 against 215 MPa for 5083 H116/H321). It does not replace 5083 or 6082 in a highly stressed load-bearing structure; if T6 strength is wanted this alloy is simply not a candidate, because it CANNOT BE HARDENED BY HEAT TREATMENT.
Compiled from manufacturer data sheets · confirm against the current specification before ordering
On this page · click to jump
What EN AW-5754 IsStandards by Product FormThe 3 % Magnesium ThresholdProduct Forms With NO Standard, or UnverifiedChemical CompositionMechanical PropertiesPhysical PropertiesHeat Treatment and Thermal StabilityWeldingMachiningCorrosionFrequently Asked QuestionsCommon Datasheet Errors and Traps
CR 1.1.0.18 / AlMg3 / 5754 / O / H111
EN AW 5754 is a type of aluminium-magnesium alloy notable in particular for its high corrosion resistance, good machinability and high formability. The alloy is suited to use in demanding environmental conditions such as the marine, automotive and chemical industries, and is also chosen in applications with a lightweight structural requirement. Belonging to the aluminium-magnesium (Al-Mg) group, EN AW 5754 generally offers moderate strength together with high corrosion resistance.
5754 has a low strength level, but its welding characteristics are good.
Machinability: EN AW 5754 shows good properties in terms of machinability. Some machining difficulties can arise because of its magnesium content, however.
Turning and milling: Cutting speed — medium cutting speeds are recommended, which gives a cleaner cut. Cutting tools — carbide inserts and hardened steel tooling should be preferred. Cooling — sufficient cutting fluid should be used during machining, because high temperatures can adversely affect machinability.
Weldability: It can readily be welded by the TIG and MIG processes.
Points to observe during welding: Care should be taken so that thermal stress does not arise during welding, and the cooling rate in the welded areas should be controlled.
Heat treatment: EN AW 5754 is generally used without heat treatment, because the required properties can be obtained by cold and hot forming. When heat treatment is applied the material can gain a certain hardness, but high temperatures and long heat treatment times can weaken its corrosion resistance.
Chemical Composition
DEFENCE METAL
Silicon (Si)
0.00 – 0.40
Chromium (Cr)
0.00 – 0.30
Manganese (Mn)
0.00 – 0.50
Magnesium (Mg)
2.60 – 3.60
Copper (Cu)
0.00 – 0.10
Titanium (Ti)
0.00 – 0.15
Iron (Fe)
0.00 – 0.40
Zinc (Zn)
0.00 – 0.20
Aluminium (Al)
Balance
Physical Properties
DEFENCE METAL
Density
2.66 g/cm³
Melting Temperature
568 °C
Coefficient of Thermal Expansion
23.9 x 10^-6 /K
Modulus of Elasticity
69 GPa
Heat Capacity
120 W/m.K
Electrical Conductivity
29% IACS
Mechanical Properties
DEFENCE METAL
Yield Strength
min 80 MPa (O / H111)
Tensile Strength
190 – 240 MPa (O / H111)
Elongation
14 – 18%
Elastisite
69 GPa
Standards and Equivalents · EN AW 5754
DEFENCE METAL
Trade name
EN AW 5754
UNS
A95754
ASTM
B209
Available forms
Round bar · Flat bar · Plate · Sheet · Tube · Forgings All forms are supplied to order.
What EN AW-5754 Is — the Alloy That Sits Right on the Threshold
EN AW-5754 (chemical symbol Al Mg3 / material number 3.3535 / US equivalent A95754 / AFNOR A-G3M / Spain L-3390 / Sweden 144133) is a non-heat-treatable aluminium-magnesium alloy. Its nominal magnesium band is 2.6 – 3.6 %. It is the mid-range workhorse of the 5xxx family: not as strong as 5083, but it forms better, anodises better and carries a lower sensitisation risk.
The key to understanding 5754 is where its magnesium band sits. In the 5xxx series, 3 % nominal magnesium is a threshold: above it, long warm exposure precipitates β phase (Al₃Mg₂) at the grain boundaries and the material opens to intergranular corrosion. ASTM B928 and the marine specifications place that threshold exactly at 3 %. 5083 (4.0–4.9 %) is far above it; 5052 (2.2–2.8 %) is below it. 5754 sits right on top of it, with one end of its band below the threshold and the other end above. That is the property of 5754 that most deserves an honest explanation, and we have given it a section of its own below.
The second key is the semi-hard tempers. 5754 is sold in practice in “half-hard” conditions such as O, H111, H22, H24 and H32. There is a reason for that: Al-Mg alloys soften spontaneously after cold work — in one source’s words, the material “spontaneously softens after rolling until reaching stable condition”. That is why the 5xxx series uses H2x (strain hardened and partially annealed) and H3x (strain hardened and stabilized) rather than plain H1x. The second digit in H22, H24 and H32 is not decoration — it is the answer to the alloy’s own instability.
Identity and International Equivalents · EN AW-5754
DEFENCE METAL
EN numerical designation
EN AW-5754
EN chemical symbol
Al Mg3
German material number
3.3535
US / AA equivalent
A95754 · AA 5754
France (AFNOR)
A-G3M
Spain · Sweden
L-3390 · 144133
A designation seen in one source
Al 3.1Mg Mn Cr — a commercial description, not a standard designation
Heat treatment class
Non-heat-treatable. Strength comes from solid solution hardening (magnesium) and cold work. There is NO solution treatment, quenching or ageing
Food contact
SUITABLE per DIN EN 602
Honest Positioning · 5754 Against Its Siblings
DEFENCE METAL
EN AW-5754 (this page)
2.6–3.6 % Mg. In O/H111 plate: Rm 190–240 MPa · Rp0.2 ≥80 MPa · A 12–18 %. Strengths: excellent formability (deep drawing rating 2), the best anodising behaviour (protective and EQ anodising rating 1), excellent weldability (TIG and MIG rating 1), excellent corrosion resistance, food compliance. Weakness: strength — about half the yield of 5083
EN AW-5083
4.0–4.9 % Mg. In H321 plate: Rm ≥305 MPa · Rp0.2 ≥215 MPa — more than twice 5754’s yield strength. The price: lower formability, a poor decorative anodising rating (4), and a marked sensitisation risk because it is far above the 3 % threshold. The right address for structural and marine work: EN AW-5083
AA 5052
2.2–2.8 % Mg — entirely below the 3 % threshold. Typical values: in O condition about 195 MPa tensile / 90 MPa yield; in H32 about 228 MPa / 193 MPa (typical values, not EN minima). Its closest rival: 5052 is the North American market’s alloy, 5754 is Europe’s. Chromium in 5052 is defined with a lower limit (0.15–0.35 %), whereas 5754 has only an upper limit (≤0.30 %). In practice they substitute for each other in most applications; the difference is in supply and specification language, not in performance
EN AW-6082
A different family: heat-treatable Al-Mg-Si. In T6/T651 plate: Rm 295–310 MPa · Rp0.2 240–260 MPa — far above 5754. But: welding costs 6082 strength in the HAZ and recovering it requires re-heat-treatment; welding returns 5754 to the O level, and 5754 is already sold largely in that condition. 5754 for sheet that will be formed, 6082 for profiles that will carry load (EN AW-6082)
EN AW-2017A · 7075
Copper- and zinc-bearing high strength alloys. They do not do 5754’s job: they are not fusion weldable, not used in seawater and not suitable for food contact (EN AW-2017A · EN AW-7075)
Standards by Product Form
STANDARDS BY PRODUCT FORM
DEFENCE METAL
Product form
Standards
Plate · sheet · strip (flat rolled)
EN 485-1 (inspection) · EN 485-2 (mechanical properties) · EN 485-3 and EN 485-4 (tolerances). No verified AMS or ASTM number was found for this form.
Tread plate / chequer plate
EN 1386 (tread plate) · EN 485-2 (mechanical properties of the base material)
Marine plate
EN 13195 (marine applications) · EN 485-2. Classification society approvals are requested per order.
Extruded rod · bar · profiles · tube
EN 755-1 (technical conditions of delivery) · EN 755-2 (mechanical properties) · EN 755-3 to -9 (tolerances)
Cold drawn rod, bar and tube
EN 754-1 · EN 754-2 (mechanical properties) · EN 754-3 to -8 (tolerances)
Forgings
EN 586-1 · EN 586-2 · EN 586-3. No numerical mechanical property table for 5754 forgings could be verified against four independent sources.
Food contact products
DIN EN 602 (suitability for the food industry)
Composition and temper (independent of form)
EN 573-3 (chemical composition) · EN 573-1 and EN 573-2 (designation system) · EN 515 (temper designations)
THERE IS NO AMS NUMBER: 5754 is a European alloy that does not appear in the aerospace specification systems, so this map is built directly on EN numbers. On the ASTM side the functional counterpart is 5052; because the presence of 5754 in the ASTM B209 / B221 alloy lists could not be verified, no ASTM number is given. EN 485-2 applies to plate and sheet, EN 755-2 to extrusions and EN 754-2 to cold drawn products; these three standards do NOT give the same values, so an order must be tied to the right one.
Standards by Product Form · EN AW-5754 (3.3535)
DEFENCE METAL
Chemical composition
EN 573-3
Plate · sheet · strip
EN 485-2 (mechanical properties) · EN 485-1 (inspection and delivery) · EN 485-3 / EN 485-4 (tolerances). Tabulated for O/H111 from 0.2 mm to 100 mm; the semi-hard and hard tempers H22, H24 and H26/H28 are covered as well
Drawn bar · tube · profile
EN 754-2 — the groups O/H111, H14/H24/H34 and H18/H28/H38 are tabulated
Extruded bar · tube · profile
EN 755-2 — F/H112 and O/H111 are tabulated. Caution: 5754’s hot extrusion rating is 4 (poor) — profiles can be made, but this is not where the alloy is strong
Marine (Europe)
EN 13195 — the product specification for shipbuilding, marine and offshore. 5754 is cited within its scope, but the default alloys for marine structural plate are 5083 and 5059
Marine (USA)
ASTM B928 / B928M — covers 5xxx products with nominal magnesium of 3 % and above. Because 5754’s band sits right on that threshold, whether a given cast falls inside the scope DEPENDS ON THE CAST CHEMISTRY — read the threshold section below
ASTM (plate/sheet)
ASTM B209 / B209M — inclusion of 5754 in the grade list could not be independently verified in this study. 5754 is a European alloy; the US market’s counterpart is in practice 5052. Confirm the scope before offering 5754 to a buyer who requires an ASTM certificate
ASTM (extrusions)
ASTM B221 / B221M — grade list not verified
Welding wire (bare)
AWS A5.10 / EN ISO 18273. Manufacturer datasheets list the fillers SG-AlMg3 and SG-AlMg5; another source recommends 5356 directly. So in practice: ER5754 / ER5654 and ER5356
Drawn wire
Covered by EN 1301-2; no value table for 5754 could be verified in this study
Pressure equipment
EN 12392 — additional requirements for pressure equipment
Forgings
The EN 586 family exists; the EN 586-2 value table for 5754 could not be verified. Hammer forging rates 2 (good), die forging 3 (moderate)
ASME Section II / VIII
Not verified in this study — we publish no code temperature
Food contact
SUITABLE per DIN EN 602 — one of 5754’s strongest commercial arguments
The 3 % Magnesium Threshold — the Topic That Most Deserves Honesty
This is the most misunderstood subject on 5754 and it deserves to be stated directly.
The Threshold Question · Why 5754 Is a Special Case
DEFENCE METAL
Mechanism
Magnesium is supersaturated in aluminium at room temperature. Given enough temperature and enough time it precipitates at the grain boundaries as β phase (Al₃Mg₂ / Mg₂Al₃). That phase is anodic to the matrix; once it forms a continuous network the material opens to intergranular corrosion and stress corrosion cracking. This is sensitisation
Why the threshold is 3 %
Sensitisation risk becomes serious once nominal magnesium exceeds 3 %. ASTM B928 and the marine specifications place it exactly there: 5xxx alloys “with nominal magnesium content equal to or higher than 3 %”, in the H116 and H321 tempers, must pass the ASTM G66 exfoliation and/or ASTM G67 intergranular corrosion tests
Where 5754 sits
Nominal band 2.6 – 3.6 %. So the lower end of the band is below the threshold and the upper end is above it. A cast delivered at 2.8 % Mg is practically below the threshold; one at 3.4 % is above it. One source gives 5754 a narrower magnesium band (2.6 – 3.2 %) — [CONTRADICTION], we have seen both
Practical consequence
5754 is markedly less exposed than 5083, but it is not immune. In a heat-exposed, long-life, chloride-bearing application, ask for the cast analysis for 5754 too, and specify an ASTM G67 test if needed. The statement “5754 does not sensitise” is not true
Does the 65 °C rule apply to 5754
Not with the same force. The 65 °C limit is explicitly stated in verified sources for 5083 (including the Australian standard AS 1734). No equivalent prohibition for 5754 was found in verified sources. But because the mechanism is the same, warm continuous service must still be handled carefully on 5754 — especially for casts whose magnesium lies at the top of the band. We do not invent a number; we state the mechanism
What lowers the risk
Lower magnesium (the bottom of the band) · less cold work (O and H111 are the most stable conditions) · lower service temperature · low welding heat input
Do H116 / H321 exist for 5754
Not as a usual product form. Those tempers are seen in practice on high-magnesium marine alloys such as 5083 and 5456. No EN 485-2 data tabulated for 5754 in H116/H321 could be verified in this study
Product Forms With NO Standard, or Unverified
EN AW-5754 · The Gaps
DEFENCE METAL
ASTM scope
This is the most important gap. 5754 is a European alloy, and its inclusion in the ASTM B209 / B221 grade lists could not be verified in this study. On US projects the counterpart requested in practice is 5052. Confirm the scope before offering 5754 on a project that mandates an ASTM certificate
H116 / H321 temper
Not verified. The marine corrosion tempers live on the 5083 side in practice
T tempers (T4, T6 etc.)
DO NOT EXIST and cannot. 5754 is not heat-treatable. There is no such material as “5754-T6”
Castings
Not applicable. 5754 is a wrought alloy; Al-Mg castings are a separate family (EN AC- series)
Covered electrodes
Not used in practice for aluminium. 5754 is welded by MIG and TIG
Bolts and nuts
5754 is not a fastener alloy; no mechanical class specification was verified
Extruded profiles (complex sections)
Covered by EN 755-2, but the hot extrusion rating is 4 (poor). For complex, thin-walled profiles 5754 is not economic; the 6xxx family (EN AW-6060 · EN AW-6082) is the natural extrusion family
A high-temperature service certificate
Does not exist. No document guarantees that a 5xxx plate will not sensitise years later
Chemical Composition
The band below follows EN 573-3. One row carries a serious contradiction between sources and we are not hiding it.
Chemical Composition · EN AW-5754 (EN 573-3, weight %)
DEFENCE METAL
Silicon (Si)
max 0.40
Iron (Fe)
max 0.40
Copper (Cu)
max 0.10 — kept deliberately low. Copper is the single element that ruins corrosion resistance in the 5xxx series
Manganese (Mn)
max 0.50
Magnesium (Mg)
2.6 – 3.6 — this row is the whole alloy.[CONTRADICTION] Another source gives the band as 2.6 – 3.2. That difference is not trivial: the 3 % threshold runs right through this band. On a critical application, ask for the cast analysis
Chromium (Cr)
max 0.30 — no lower limit. For comparison, chromium in 5052 is bounded below at 0.15–0.35 %
Zinc (Zn)
max 0.20
Titanium (Ti)
max 0.15 — grain refiner
The combined Mn + Cr row
[CONTRADICTION WARNING] One manufacturer datasheet shows a band of 0.10 – 0.60 and attributes it to titanium. That directly contradicts the Ti ≤0.15 % given by another source and is not physically plausible; it is most likely a misread combined Mn+Cr row. But we could not verify that — so we do not publish this band as an element row. If you are writing a specification, confirm against the current edition of EN 573-3
Other elements
each max 0.05 · total max 0.15
Aluminium (Al)
remainder
Mechanical Properties
STRENGTH BY AGEING CONDITION
DEFENCE METAL
Condition
Hardness
Yield MPa
Tensile MPa
Elongation
EN 485-2 · O / H111 · sheet 0.5-1.5 mm
—
80
190-240
14 % min (A50)
EN 485-2 · O / H111 · sheet 1.5-3.0 mm
—
80
190-240
16 % min (A50)
EN 485-2 · O / H111 · sheet 3.0-6.0 mm
—
80
190-240
18 % min (A50)
EN 485-2 · H22 / H32 · sheet 0.5-1.5 mm
—
130
220-270
8 % min (A50)
EN 485-2 · H22 / H32 · sheet 1.5-3.0 mm
—
130
220-270
10 % min (A50)
EN 485-2 · H22 · sheet and plate 0.2-40 mm (Aalco thickness band)
—
130
220-270
7 % min (A50)
EN 485-2 · H24 / H34 · sheet and plate 0.2-25 mm
—
160
240-280
6 % min (A50)
H112 · hot worked product
—
80
180
12-14 % min
H22 / H24 / H26 band — PRODUCER TYPICAL value (not a minimum)
—
185-245
245-290
10-15 %
Every row is an EN 485-2 SPECIFICATION MINIMUM; the last row alone is a producer typical value and must not be mixed in. Because this alloy does not precipitation harden, the rows are ordered by TEMPER and not by an ageing condition. Rockwell C is not measured on aluminium. In the chart, a value given as a range is drawn at its lower bound; the full range is in the table. No HRC is given: Rockwell C is not measured on aluminium; hardness is reported as Brinell (HBW/HB) or Vickers. H22 shares a strength row with H32 and H24 with H34; the difference between them is the production route (partial annealing versus stabilising), not the strength. The last row is a producer typical value covering the whole H22-H26 band together and does not belong to the same thickness band as the specification minima.
There is a genuine contradiction between sources in this section and we give both sets. The values for the semi-hard tempers (H22 / H24) came out differently in two separate manufacturer documents. If you are writing a specification, confirm against the current edition of EN 485-2.
Plate · Sheet — O / H111 (EN 485-2, by thickness)
DEFENCE METAL
0.2 – 0.5 mm
Rm 190 – 240 MPa · Rp0.2 min 80 MPa · A min 12 % · ~52 HBW
0.5 – 1.5 mm
Rm 190 – 240 MPa · Rp0.2 min 80 MPa · A min 14 % · ~52 HBW
1.5 – 3.0 mm
Rm 190 – 240 MPa · Rp0.2 min 80 MPa · A min 16 % · ~52 HBW
3.0 – 6.0 mm
Rm 190 – 240 MPa · Rp0.2 min 80 MPa · A min 18 % · ~52 HBW
6.0 – 12.5 mm
Rm 190 – 240 MPa · Rp0.2 min 80 MPa · A min 18 % · ~52 HBW
12.5 – 100 mm
Rm 190 – 240 MPa · Rp0.2 min 80 MPa · A min 17 % · ~52 HBW
The row to read
Rm has an UPPER limit (240 MPa). It exists to guarantee formability: an over-hardened “annealed” plate cracks on the brake. Elongation reaches 18 % — that is 5754’s commercial reason to exist
Plate · Sheet — Semi-Hard and Hard Tempers [TWO SOURCES, CONTRADICTORY]
[CONTRADICTION] Another document from the same manufacturer group gives all three tempers in a single band: Rp0.2 185 – 245 MPa · Rm 245 – 290 MPa · A 10 – 15 %. That band is clearly higher than source A’s H22 and H24 values. We have seen both; we are not choosing between them
H111 treadplate
One source gives Rm 160 – 200 MPa · Rp0.2 ~60 MPa — LOWER than the O/H111 values for flat sheet, which follows from the product logic of treadplate. Do not use treadplate values for flat sheet
What to do
If you work in a semi-hard temper, fix the acceptance values in writing at the order stage, referenced to EN 485-2. Do not design on the strength of two conflicting commercial documents
Drawn and Extruded Products (EN 754-2 · EN 755-2)
DEFENCE METAL
Drawn round bar ≤80 mm · O/H111
Rm 180 – 250 MPa · Rp0.2 min 80 MPa · A min 14 – 16 % · ~45 HBW
Drawn product ≤25 mm · H14 / H24 / H34
Rm 240 – 290 MPa · Rp0.2 min 180 MPa · A min 3 – 4 % · ~75 HBW
Drawn product ≤10 mm · H18 / H28 / H38
Rm min 280 MPa · Rp0.2 min 240 MPa · A min 2 – 3 % · ~88 HBW
Extruded product ≤150 mm · F / H112
Rm min 180 MPa · Rp0.2 min 80 MPa · A min 12 – 14 % · ~47 HBW
Extruded product ≤150 mm · O/H111
Rm 180 – 250 MPa · Rp0.2 min 80 MPa · A min 15 – 17 % · ~45 HBW
An important observation
The EN tables merge H14, H24 and H34 into THE SAME ROW (and likewise H18/H28/H38 and H12/H22/H32). So in terms of mechanical acceptance criteria those three tempers are equivalent; the difference lies in the production route: H1x = strain hardened only, H2x = strain hardened and partially annealed, H3x = strain hardened and stabilized
Hard temper warning
In H18/H28/H38 the elongation falls to 2 %. That material does not bend. Anywhere forming is involved, use O/H111 or at most H22
Physical Properties
Physical Properties · EN AW-5754
DEFENCE METAL
Density
2.67 g/cm³ [one manufacturer] · 2.66 g/cm³ [two sources] — the difference is negligible
One source gives about 600 °C. That is a single-point simplification — alloys freeze over a range; no verified solidification range for 5754 was obtained in this study
Erosion resistance
Manufacturer rating 1 (very good) — a notable advantage in abrasive flow and particle-carrying lines
Dimensional stability
Manufacturer rating 3 (moderate)
Heat Treatment and Thermal Stability
HEAT TREATMENT — SCHEMATIC
DEFENCE METAL
1 · ANNEALING — O temper
Step
1 · ANNEALING — O temper
Summary
Removes all the strain hardening gained by cold work; recrystallisation gives the softest and most ductile condition. IT SOFTENS, IT DOES NOT HARDEN.
Temperature
360-380 °C (BIKAR). The Alumeco profile data sheet gives 300 °C as the annealing temperature for 5xxx. The sources do not agree on one figure, so no single value is given.
Time
BIKAR: 1-2 hours heating. No common soak time could be verified across four independent sources.
Cooling
BIKAR: in the furnace, uncontrolled. Since the alloy does not harden by heat treatment, the cooling rate does not set the strength.
Resulting hardness
EN 485-2 O/H111: Rp0.2 min 80 MPa, Rm 190-240 MPa, about 45-52 HBW.
DEFENCE METAL
2 · COLD WORK — H1x family (strain hardened only)
Step
2 · COLD WORK — H1x family (strain hardened only)
Summary
Cold rolling or cold drawing. THERE IS NO HEAT TREATMENT. The second digit gives the amount of deformation: H12 < H14 < H16 < H18 (H18 is full hard).
Temperature
Room temperature. No heat treatment is applied.
Time
Depends on the production route; the specification gives no time.
Cooling
None.
Resulting hardness
No common EN 485-2 value for the H1x rows could be verified across four independent sources, so they are not carried in the strength table.
More cold work than the target is applied, then a PARTIAL ANNEAL brings the strength back down in a controlled way and restores ductility. This is the main commercial temper family for 5754.
Temperature
The partial annealing temperature depends on the producer’s process; no figure could be found across four independent sources.
Time
Not verified.
Cooling
Not verified.
Resulting hardness
EN 485-2 H22: Rp0.2 min 130 MPa, Rm 220-270 MPa, about 63 HB · H24: Rp0.2 min 160 MPa, Rm 240-280 MPa, about 70 HB.
After cold work the 5xxx alloys soften by themselves at room temperature. A low temperature heat treatment completes that softening in advance and makes the properties STABLE. THIS IS NOT AN AGEING TREATMENT: no precipitation hardening occurs; on the contrary, strength drops slightly and ductility rises.
Temperature
Stabilising is a low temperature heat treatment; no numerical temperature for 5754 could be verified across four independent sources.
Time
Not verified.
Cooling
Not verified.
Resulting hardness
In the logic of EN 485-2, H22 shares a strength row with H32 and H24 with H34.
DEFENCE METAL
5 · H111 — light work after annealing
Step
5 · H111 — light work after annealing
Summary
Material that has had a small amount of cold work such as levelling or stretching after the O temper, without reaching the H11 level. In EN 485-2 it shares the strength row with O.
Temperature
No additional heat treatment.
Time
—
Cooling
—
Resulting hardness
Same as O/H111: Rp0.2 min 80 MPa, Rm 190-240 MPa, A50 min 14-18 % depending on thickness.
DEFENCE METAL
6 · H112 — as hot worked, no further processing
Step
6 · H112 — as hot worked, no further processing
Summary
Product that has had no further cold work or heat treatment after hot forming (rolling, extrusion) but that still meets the mechanical property limits.
Temperature
No further heat treatment is applied.
Time
—
Cooling
—
Resulting hardness
BIKAR: Rm about 180 MPa, Rp0.2 80 MPa, elongation min 12-14 %, about 47 HBW.
DEFENCE METAL
7 · AFTER WELDING — nothing is done
Step
7 · AFTER WELDING — nothing is done
Summary
No post-weld heat treatment is applied. The welding heat removes the strain hardening in the HAZ and the zone falls back towards O (annealed) strength; there is NO heat treatment that could undo that, because the alloy does not precipitation harden.
Temperature
Not applicable.
Time
—
Cooling
—
Resulting hardness
The weld zone is designed with the O/H111 minima.
THIS ALLOY DOES NOT PRECIPITATION HARDEN. There is NO solution-treat, quench and age cycle and no ageing step of any kind. Strength comes from magnesium in solid solution plus COLD WORK (strain hardening); the job of heat treatment here is not to add strength but to remove the strain hardening (annealing) or to make the properties stable (stabilising). The steps below are TEMPER PRODUCTION ROUTES, not a heat treatment cycle. The diagram is schematic, the time axis is NOT to scale, and no curve is drawn because no published TTT/CCT curve was used. There is NO ageing step in this alloy. STABILISING in the H3x family is not an ageing treatment; it does not raise strength, it lowers it slightly and makes it stable. Reading the H temper code: the first digit gives the processing route (1 = strain hardened only, 2 = strain hardened and partially annealed, 3 = strain hardened and stabilised) and the second digit the degree of deformation. The diagram is schematic; the time axis is not to scale.
There is NO strengthening heat treatment for 5754. Heat treatment exists only to soften or to stabilize.
Heat Treatment · EN AW-5754
DEFENCE METAL
Solution treatment + ageing
DOES NOT EXIST. 5754 is not heat-treatable
Soft annealing (O)
360 – 380 °C, hold 1 – 2 hours, then furnace cooling (uncontrolled). For comparison, the same manufacturer gives 380–420 °C for 5083 — higher magnesium, higher annealing temperature
Partial annealing (the “2” in H2x)
A partial anneal applied after cold work that brings the material back to the target strength level. H22 and H24 are produced this way
Stabilization (the “3” in H3x)
A low-temperature treatment that brings the material to a stable condition. It is necessary on Al-Mg alloys, because they soften spontaneously after cold work. H32 is produced this way
Why plain H1x is not used
In one source’s words the material “spontaneously softens after rolling until reaching stable condition”. The strength of a merely strain-hardened 5xxx sheet drifts over time; H2x and H3x stop that drift. That is the answer to why 5754’s temper system is so crowded
Post-weld heat treatment
Not done and not needed. Welded 5754 is left as welded
Hot forming
Hammer forging rates 2 (good), die forging 3 (moderate), hot extrusion 4 (poor)
The harmful window
Long warm service carries a β phase precipitation risk if the magnesium sits at the top of the band. No verified numerical temperature limit for 5754 was obtained; see the threshold section above for the mechanism
Welding
5754 is among the best welding alloys in the aluminium family. Manufacturer rating tables give TIG 1, MIG 1 (on a scale where 1 = very good), gas welding 2 and resistance welding 3. Another source calls gas, arc and resistance welding all “excellent”.
Welding Parameters · EN AW-5754
DEFENCE METAL
Primary processes
MIG and TIG — both rated 1. TIG on thin sheet, MIG in volume production
Filler metal
Manufacturer datasheets list SG-AlMg3 (matching base metal chemistry) and SG-AlMg5; another source recommends 5356 directly. In practice: ER5754 / ER5654 (matching chemistry) or ER5356 (more common, higher strength)
The filler you must not use
Do not use 4043 (Al-Si). Combined with a magnesium-bearing base metal it forms Mg₂Si in the weld metal; the result is a brittle weld that is open to corrosion. 5xxx base metal takes 5xxx filler.
Preheat
Not required. Warming to drive off condensation is the only acceptable use
Interpass temperature
Keep it low. High heat input both widens the HAZ and encourages β phase precipitation. No verified numerical upper limit was obtained in this study
Brazing
Poor. Brazing with flux rates 4–5, without flux 4. Soft soldering is also 4–5. 5754 is welded, not brazed
Cleanliness
Remove the oxide layer with a stainless steel wire brush, and remove oil and moisture. Hydrogen porosity is the number one defect in aluminium welding
Post-weld strength
In the HAZ the strain hardening from cold work is lost and the material locally returns to the O level. But 5754 is already largely sold in the O/H111 condition: the loss in a welded 5754 structure is far smaller than in alloys that start from a hard temper. Design rule: calculate the welded structure with O/H111 values
Machining
5754 is not “hard”, it is “sticky” — the common problem of the 5xxx family. The manufacturer machinability rating is 2 (good) in the cold-worked condition and 3 (moderate) when soft annealed; another source simply calls it “average”. The problem is not cutting speed but the chip refusing to break. Where possible, machine the strain-hardened temper rather than the soft one.
Machining Parameters · 5754, carbide tooling
DEFENCE METAL
Turning
380 – 620 m/min (1,250–2,030 SFM)
Milling
470 – 780 m/min (1,540–2,560 SFM)
Drilling
155 – 260 m/min (510–850 SFM)
Machinability index
170 – 280 % against the reference base
Carbide grade
Uncoated fine-grain carbide or PVD-coated N-group. A sharp edge and polished flutes are mandatory
Tool geometry
High positive rake, wide helix, few flutes (2–3). Chip clearance is critical
Coolant
Flood emulsion. Dry cutting produces built-up edge (BUE); the finish degrades and dimensions drift
Chip form
Long, ductile, stringy chips. The common weakness of the 5xxx series. Use chip-breaking geometry and higher feed. For bar-fed automatic turning, 5754 is the wrong alloy
Forming ratings
Cold bending 2 (good) · deep drawing 2 (good) · pressure forming 3 (moderate). 5754’s real job is forming, not machining
Corrosion — Where It Excels, and WHERE IT FAILS
COMPARISON
CRITERION: (1) STRENGTH, compared only through SPECIFICATION MINIMA of the same standard family — EN 485-2 for flat products, EN 755-2 for extrusions; typical values are not mixed in. (2) STRENGTHENING MECHANISM: heat-treatable (2017A, 6060, 6082, 7075) versus non-heat-treatable (5754). (3) WELDABILITY, expressed through filler metal and post-weld behaviour as well as the producers’ 1-5 / 1-6 ratings. (4) CORROSION RESISTANCE, as normal atmosphere plus seawater plus stress corrosion cracking. (5) MACHINABILITY, from producer ratings per temper. The rows are ordered by strength class, not by preference.
DEFENCE METAL
Grade
Mechanism
Strength
Weldability
Corrosion
Limit
EN AW-2017A (AlCu4MgSi(A) · 3.1325)
HEAT-TREATABLE. Solution treatment 495-505 °C + quench + NATURAL ageing (T4/T451). Hardening comes from Al2Cu / Al2CuMg precipitation. Artificial ageing (T6) is not used commercially.
EN 755-2 minima: T4 extruded rod up to 25 mm diameter, Rp0.2 min 260 MPa, Rm min 380 MPa. EN 485-2 sheet T4/T451: Rp0.2 240-260 MPa, Rm 350-390 MPa.
NOT SUITABLE FOR FUSION WELDING. Producer data sheets rate gas, TIG and MIG as unsuitable; only resistance (spot) welding is usable. Structural joints are riveted or bolted.
Poor. With copper at 3.5-4.5 % the cathodic Al2Cu particles drive galvanic attack; poor in normal atmosphere and unsuitable for seawater. Plating, anodising or paint is mandatory.
Not used in welded structures or in seawater. Decorative anodising is unsuitable. Even in T451, asymmetric machining of heavy sections is reported to cause distortion.
EN AW-5754 (AlMg3 · 3.3535)
NOT HEAT-TREATABLE. Strength comes from magnesium in solid solution plus COLD WORK (H tempers). There is NO solution treatment or ageing step; tempers such as T4 or T6 are not defined for this alloy.
EN 485-2 minima: O/H111 Rp0.2 min 80 MPa, Rm 190-240 MPa · H22 Rp0.2 min 130 MPa, Rm 220-270 MPa · H24 Rp0.2 min 160 MPa, Rm 240-280 MPa. The lowest strength class of the five.
THE BEST OF THE FIVE. Gas, arc and resistance welding all rated very good; filler SG-AlMg3 and SG-AlMg5. No post-weld heat treatment is needed or possible; the HAZ returns to annealed (O) strength and the design uses that value.
Very good. Resists seawater and industrially polluted atmospheres; covered by DIN EN 602 for food contact.
Does not replace the others in highly stressed load-bearing structures. Machinability is moderate to poor (soft, gummy chips). Because the magnesium band is 2.6-3.6 %, beta phase (Mg2Al3) sensitisation becomes relevant at the top of the band, so prolonged warm service needs the same care as 5083.
EN AW-6060 (AlMgSi · 3.3206)
HEAT-TREATABLE, by Mg2Si precipitation. Cooling at the exit of the extrusion press (press quench) takes the place of a separate solution treatment; artificial ageing then gives T5. For T6 a separate furnace solution treatment, quench and ageing are applied.
EN 755-2 minima (rod up to 150 mm): T4 60/120 MPa · T5 120/160 MPa · T6 150/190 MPa · T66 160/215 MPa. The second lowest of the five and clearly below 6082.
Good. TIG and MIG rated 2 (good). Filler SG-AlMg5, AlSi5, or AlMg3 where the part will be anodised. Welding heat reduces HAZ strength by roughly 50 %.
Very good (normal atmosphere rated 1), good in marine atmosphere. IT IS THE BEST OF THE FIVE FOR DECORATIVE ANODISING, because low iron and manganese give consistent colour and gloss.
Strength is low; a load-bearing structure needs 6082. There is no EN mechanical property table for this alloy in sheet, plate or forging form — in practice 6060 is an EXTRUSION alloy.
EN AW-6082 (AlSi1MgMn · 3.2315)
HEAT-TREATABLE. Solution treatment 525-540 °C + quench + ARTIFICIAL AGEING 155-190 °C. Hardening comes from Mg2Si (beta”) precipitation.
EN 755-2 minima: T6 rod 20-150 mm Rp0.2 min 260 MPa, Rm min 310 MPa · T4 Rp0.2 min 110 MPa, Rm min 205 MPa. EN 485-2 T6/T651 plate 6-12.5 mm: 255/300 MPa. The highest class among the weldable alloys here.
Good. MIG rated 1 (very good), TIG 2. Filler 4043/AlSi5 for self-welding or 5356/AlMg5. HOWEVER the HAZ overages and softens: in a peer-reviewed measurement the proof strength falls from about 260 MPa to below 130 MPa, roughly a 50 % loss.
Very good (normal atmosphere 1, marine atmosphere 2). Can be certified for marine use under EN 13195.
In a welded structure it does not match the corrosion behaviour of 5083/5754. It is quench sensitive: in heavy sections a slower cooling rate misses the T6 values. For decorative anodising it is behind 6060 because of the manganese.
EN AW-7075 (AlZn5.5MgCu · 3.4365)
HEAT-TREATABLE. Solution treatment 470-480 °C + quench + ARTIFICIAL AGEING. Hardening comes from MgZn2 (eta’) precipitation. T73/T7351 is a TWO-STAGE OVERAGEING treatment that trades strength away to buy resistance to stress corrosion cracking (SCC).
EN 485-2 minima: T651 plate 6-12.5 mm Rp0.2 min 460 MPa, Rm min 540 MPa. EN 755-2 T6 extruded rod up to 25 mm: 505/570 MPa. By far the highest of the five.
NOT SUITABLE FOR FUSION WELDING. Producer data sheets rate gas, TIG and MIG as unsuitable and the Alcoa weldability table simply states NO. Only resistance welding is usable; joints are riveted or bolted.
Poor. Producer data sheets rate normal atmosphere and seawater 4-5 (poor to unsuitable). THE GOVERNING LIMIT IS STRESS CORROSION CRACKING: Kaiser rates T6/T651 as ‘C’ — service failures with sustained tension stress acting in the short transverse direction.
T6/T651 in heavy section is open to SCC in the short transverse direction, which is why critical parts are ordered in T73/T7351. It cannot be welded. Continuous service temperature is about 90 °C (BIKAR). Decorative anodising is unsuitable.
DEFENCE METAL
Additional information
Vurgu
en-aw-5754
Every strength row is a SPECIFICATION MINIMUM; producer typical values are not mixed into this table. 5754 is the only non-heat-treatable alloy here; the other four are solution treated, quenched and aged. The two mechanisms are not interchangeable. 2017A and 7075 are not suitable for fusion welding; 5754, 6060 and 6082 are weldable. Even in the weldable three the weld zone loses strength. In 7075, T73/T7351 is an overageing treatment: strength is deliberately lowered in exchange for resistance to stress corrosion cracking.
Where it excels
In the manufacturer rating tables 5754 scores 1 (very good) in normal atmosphere and weather and 1–2 (very good to good) in a seawater atmosphere. Another source uses the phrase “excellent corrosion resistance especially to seawater and industrially polluted atmospheres”. The reason: magnesium stabilises the oxide film in chloride environments, and copper is held below 0.10 %.
5754’s real advantage over 5083 is on the surface side. The anodising ratings: protective anodising 1 (very good), EQ (special quality) anodising 1 (very good), decorative anodising 2 (good), polishing 1–2. For comparison, 5083’s decorative anodising rating is 4 (poor). For visible architectural surfaces, decorative panels and anodised body parts, the right 5xxx alloy is 5754, not 5083. Note: EQ quality must be ordered and confirmed separately; standard delivery does not cover it.
WHERE IT FAILS
EN AW-5754 · Failure Points
DEFENCE METAL
Sensitisation (at the top of the band)
5754’s magnesium band crosses the 3 % threshold. A cast whose magnesium lies at the top of the band can precipitate β phase (Al₃Mg₂) and open to intergranular corrosion in long, warm, chloride-bearing service. The statement “5754 does not sensitise” is not true — what is true is that it is markedly less exposed than 5083
Galvanic corrosion
5754 is active relative to steel, stainless steel, copper and bronze; in contact, the aluminium is the sacrificial side. If stainless fasteners are used, insulating bushes and washers are mandatory
Strong alkalis
Above pH 9 the oxide film dissolves. Alkaline cleaners and contact with concrete or mortar require attention
Mercury and its compounds
Absolutely forbidden — as with all aluminium alloys
Waters containing copper ions
Copper plates out on the aluminium surface and forms micro cathodes
Paint and coating
Manufacturer rating 3 (moderate) — unlike the anodising ratings, the paint side is average. A suitable conversion coating primer is needed
Anywhere high strength is needed
This is an engineering failure, not a corrosion one. In O/H111 the yield strength is only 80 MPa. Choosing 5754 for a load-bearing structure thickens the section and cancels the weight advantage. In that case 5083 or 6082 is the right answer
Complex extruded profiles
Hot extrusion rating 4 (poor). For thin-walled, complex sections the 6xxx family (6060 · 6082) is the right address
Frequently Asked Questions
5754 or 5052? The specification says 5052 but my supplier is offering 5754.
This is the most common 5754 question in daily practice, and the answer is “usually fine, but do not substitute automatically”. The two alloys do the same job: both are non-heat-treatable Al-Mg, both weld, both resist seawater, both serve food and forming applications. The difference is chemistry: 5754 carries 2.6–3.6 % Mg, 5052 carries 2.2–2.8 % Mg — so 5754 has more magnesium and is slightly stronger. Chromium in 5052 is also defined with a lower limit (0.15–0.35 %), while 5754 has only an upper limit (≤0.30 %). Three questions decide the substitution: (1) Is the specification ASTM or EN? 5052 is an ASTM/AA alloy and one of the ASTM B209 grades; inclusion of 5754 in the ASTM B209 grade list could not be verified in this study. If an ASTM certificate is required, the substitution creates a certification problem. (2) Does the 3 % threshold matter? In a heat-exposed, long-life, chloride-bearing application, 5754’s higher magnesium means theoretically more sensitisation risk. (3) Do the mechanical values line up? Compare the specific temper band you are working in. Conclusion: technically it is usually acceptable, but make the substitution with the customer’s written approval.
What is the difference between H22, H24 and H32? Which hardness should I ask for?
The digits mean this: the second digit states the process route, the third states the hardness grade. H1x = strain hardened only. H2x = strain hardened and partially annealed. H3x = strain hardened and stabilized. Third digit: 2 = quarter hard, 4 = half hard, 6 = three-quarter hard, 8 = full hard. So H22 = quarter hard (partially annealed), H24 = half hard (partially annealed), H32 = quarter hard (stabilized). Why is H1x almost never seen in the 5xxx series? Because Al-Mg alloys soften spontaneously after cold work; a merely strain-hardened sheet loses strength over time. H2x and H3x stop that drift.Practical selection:if it will be bent, deep drawn or formed, take O or H111 (elongation up to 18 %); if you want some strength together with light forming, take H22; for flat panels where strength matters and forming is minimal, take H24. Go to H26/H28 only if there is no forming at all — in drawn product the elongation in H18/H28/H38 falls to 2 %. Warning: the two commercial documents we have for H22 and H24 gave conflicting values; fix the acceptance criteria in writing at the order stage with a reference to EN 485-2.
Can 5754 be used in food equipment? Will it be cheaper than stainless?
Yes it can — and this is one of 5754’s strongest commercial arguments. Manufacturer datasheets state explicitly that 5754 is suitable for food contact per DIN EN 602. On the same criterion 5083 is suitable too; copper-bearing 2017A, by contrast, is not. 5754’s advantages on the food side: excellent corrosion resistance, excellent weldability (TIG and MIG rating 1), excellent formability (deep drawing rating 2) and very good anodising behaviour (rating 1) — that is, a hygienic, cleanable surface. But let us be honest: it does not replace stainless everywhere: (1) the yield strength in the O condition is only 80 MPa — insufficient for load-bearing frames and legs; (2) strong alkaline cleaners attack aluminium (above pH 9), so CIP chemistry must be checked; (3) wear resistance is below stainless. Correct use: tank shells, hoppers, silos, chutes, covers, panels, handling equipment, and anywhere heat transfer helps (thermal conductivity 140–160 W/(m·K), roughly ten times stainless). Wrong use: highly loaded structural members and surfaces exposed to aggressive alkaline washdown.
Would 5083 be better than 5754? They are both Al-Mg.
It depends on the job, and the two alloys really are built for different jobs.Strength: 5083-H321 plate gives Rp0.2 ≥215 MPa; 5754-O/H111 plate gives Rp0.2 ≥80 MPa. So 5083 is more than twice as strong — if the work is structural, the discussion ends there. Formability: in 5754-O the elongation reaches 18 % and the deep drawing rating is 2; 5083’s values are lower. If there is deep drawing or complex bending, 5754 wins.Surface: 5754’s decorative anodising rating is 2 (good), 5083’s is 4 (poor). If there is a visible surface, 5754 wins.Sensitisation: 5083 at 4.0–4.9 % Mg is far above the threshold and does not go into continuous service above 65 °C; 5754 (2.6–3.6 %) sits on the threshold and is less exposed. Summary:structures, boats, tanks, armour → 5083 (EN AW-5083); formed sheet, body panels, food equipment, anodised visible surfaces → 5754.
Common Datasheet Errors and Traps
1. Taking semi-hard temper values from a single source. Two different documents from the same manufacturer group gave conflicting values for H22/H24: one gave H22 Rm 220–270 / Rp0.2 130 and H24 Rm 240–280 / Rp0.2 160; the other gave all three tempers in one band as Rp0.2 185–245 / Rm 245–290. For a design, confirm against the current edition of EN 485-2. 2. Treating the magnesium band as a single number. Sources contradict between 2.6–3.6 % and 2.6–3.2 %. Because the 3 % threshold runs right through that band, the difference is not trivial. On a critical application, ask for the cast analysis. 3. The titanium row. One manufacturer datasheet attributes a band of 0.10–0.60 to titanium; that directly contradicts the Ti ≤0.15 % given by another source and is most likely a misread combined Mn+Cr row. We could not verify it, so we do not publish it as an element row. 4. “5754 does not sensitise”.Wrong. The correct statement: its magnesium band crosses the 3 % threshold, so it is markedly less exposed than 5083 but not immune. Check the cast analysis for heat-exposed, long-life, chloride-bearing applications. 5. Either blindly carrying 5083’s 65 °C rule over to 5754 — or ignoring it entirely. Both are mistakes. The 65 °C limit is stated in verified sources for 5083 (including AS 1734); no equivalent prohibition for 5754 was found in verified sources. But the mechanism is the same and warm continuous service demands care. Do not invent a number; explain the mechanism. 6. “5754-T6” or any T temper.No such material exists. 5754 is not heat-treatable. 7. Using treadplate values for flat sheet. One source gives H111 treadplate as Rm 160–200 MPa · Rp0.2 ~60 MPa — below the O/H111 values for flat sheet. 8. “Density 2.66 kg/m³”. We saw this in one source; it is a unit error. The correct figure is 2.66 g/cm³, i.e. 2660 kg/m³. 9. “Melting point 600 °C”. Alloys do not melt at a single point. No verified solidification range for 5754 was obtained in this study; a single figure is a simplification. 10. The modulus contradiction. Sources give 70.5 GPa and 68 GPa. If you are calculating deflection that is a 3.5 % difference; state which one you used. 11. Treating H2x and H3x as different strength classes.The EN tables merge H14/H24/H34 into the same row (and likewise H12/H22/H32 and H18/H28/H38). The mechanical acceptance criteria are equivalent; the difference is the production route. 12. Using 4043 filler. It produces brittle Mg₂Si. 5xxx base metal takes 5xxx filler. 13. Ordering 5754 while expecting an ASTM certificate. 5754 is a European alloy; its inclusion in the ASTM B209 / B221 grade lists could not be verified in this study. If the specification is American, 5052 is what is asked for. 14. Assuming EQ anodising quality is standard delivery.EQ must be ordered and confirmed separately; producers exclude liability for decorative anodising results. 15. Asking for 5754 extrusions for a complex profile.Hot extrusion rating 4 (poor). Thin-walled, complex sections are the 6xxx family’s work (6060 · 6082). 16. Planning bends in a hard temper. In drawn product the elongation in H18/H28/H38 falls to 2 %. If there is forming, use O/H111 or at most H22. 17. Using stainless fasteners without insulation. 5754 is active relative to stainless; in a salt environment the aluminium is the sacrificial side. 18. Ignoring the upper limit on Rm. For O/H111, Rm is capped at 240 MPa. That is not a defect but a guarantee of formability; an “annealed” plate above the cap cracks on the brake.
