{"id":3635,"date":"2026-09-16T11:11:19","date_gmt":"2026-09-16T08:11:19","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-430\/"},"modified":"2026-09-25T21:15:09","modified_gmt":"2026-09-25T18:15:09","slug":"aisi-430","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-430\/","title":{"rendered":"AISI 430 \/ (1.4016)"},"content":{"rendered":"

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AISI 430 \/ (1.4016) \/ UNS S43000 \/ AMS 5503 \/ AMS 5627<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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AISI 430<\/div>\n
UNS S43000 \u00b7 W.Nr. 1.4016 \u00b7 X6Cr17 \u00b7 ~17% Cr. This is a FERRITIC stainless steel: it does NOT harden by heat treatment, it gains no strength from quenching and it does NOT precipitation harden – there is NO H900 \/ H1025 type ageing step. Three independent sources state this plainly: Ulbrich ‘Heat Treatable: No’, Penn Stainless ‘a ferritic, straight chromium, non-hardenable grade’, worldstainless ‘not thermally hardenable’. ASTM S43000 (SSINA, BSSA, Aircraft Materials): C 0.12% max – Mn 1.00% max – Si 1.00% max – P 0.040% max – S 0.030% max – Cr 16.0-18.0% – Ni 0.75% max – balance Fe. EN 10088 for 1.4016 (Aalco, Rodacciai, Lucefin, DEW, thyssenkrupp): C 0.08% max – Si 1.00% max – Mn 1.00% max – P 0.040% max – S 0.030% max (EN 10088-3 long products) or 0.015% max (EN 10088-2 flat products; thyssenkrupp and worldstainless) – Cr 16.0-18.0% – balance Fe. THE CARBON CEILING DIFFERS BETWEEN THE TWO STANDARDS: 0.12% in ASTM, 0.08% in EN. Lucefin recommends holding sulfur at 0.015% max for polishability.<\/div>\n
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Not to be confused with<\/div>\n

AISI 304<\/a>AISI 430F<\/a>AISI 434<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
Bought where an indoor, chloride-free or mildly chloride environment needs a nickel-free, low-cost stainless surface. worldstainless lists dishwasher linings, refrigerator cabinet panels, automotive trim, lashing wire, element supports, stove trim rings, fasteners and chimney liners;<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar, flat bar, plate, sheet, pipe, forging. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS: 5503 (sheet, strip and plate) \u00b7 5627 (bars, wire and forgings). ASTM (the full list from the SSINA type\/specification table): A182 (forged flanges, fittings and valves) \u00b7 A240 \/ A240M (plate, sheet, strip) \u00b7 A268 (seamless and welded ferritic tubing) \u00b7 A276 (bars and shapes) \u00b7 A314 (billets and bars for forging) \u00b7 A473 (forgings) \u00b7 A479 \/ A479M (bars and shapes for boilers and pressure vessels) \u00b7 A493 (cold heading and cold forging bar and wire) \u00b7 A511 (seamless mechanical tubing) \u00b7 A554 (welded mechanical tubing) \u00b7 A580 (wire) \u00b7 A815 (ferritic pipe fittings) \u00b7 A1012 (condenser tubes) \u00b7 F593 \/ F594 \/ F738 \/ F836 (fasteners) \u00b7 F2215 (bearing balls) \u00b7 F2281 (bolts for heat resistance). ASME: SA-182 \u00b7 SA-240 \u00b7 SA-268 \u00b7 SA-479. EN: 1.4016 \u00b7 EN 10088-2 (flat products) \u00b7 EN 10088-3 (long products). SAE type number: 51430.
AMS 5503 and AMS 5627 are tied directly to Type 430 by THREE INDEPENDENT SOURCES: the AMS column of the Type 430 row in the SSINA specification table reads ‘5503 5627’;<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
It carries no nickel at its corrosion class, and the 17% chromium surface comes with very high resistance to stress corrosion cracking. Aalco states that 430 shows ‘very high resistance to stress corrosion cracking’;<\/div>\n<\/div>\n
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Welding<\/div>\n
It is welded under conditions. Aalco and worldstainless recommend a PREHEAT of 150-200 \u00b0C. Aalco lists 430, 308L, 309, 310 or 312 as filler materials; worldstainless lists 430, 308L, 309 and 310 and adds that AS 1554.6 pre-qualifies welding 430 with grade 309 filler rods and electrodes;<\/div>\n<\/div>\n
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Limits<\/div>\n
1) IT DOES NOT HARDEN BY HEAT TREATMENT. If strength is wanted, this is the wrong grade: it gains no hardness from quenching and tempering and it does not precipitation harden. 2) FORBIDDEN BAND – 475 \u00b0C EMBRITTLEMENT, roughly 400-550 \u00b0C.<\/div>\n<\/div>\n
REQUEST A QUOTE<\/a>All stainless steels →<\/a>TECHNICAL DETAILS ↓<\/span><\/div>\n
Compiled from manufacturer data sheets \u00b7 confirm against the current specification before ordering<\/div>\n<\/div>\n<\/div>\n

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