{"id":3637,"date":"2026-09-16T11:11:25","date_gmt":"2026-09-16T08:11:25","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-405\/"},"modified":"2026-09-25T21:15:12","modified_gmt":"2026-09-25T18:15:12","slug":"aisi-405","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-405\/","title":{"rendered":"AISI 405 \/ (1.4002)"},"content":{"rendered":"

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AISI 405 \/ (1.4002) \/ UNS S40500<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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AISI 405<\/div>\n
UNS S40500 \u00b7 W.Nr. 1.4002 \u00b7 X6CrAl13 \u00b7 ~13% Cr – 0.10-0.30% Al. 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. ASTM S40500 (SSINA, BSSA, Penn Stainless): C 0.08% max – Mn 1.00% max – Si 1.00% max – P 0.040% max – S 0.030% max – Cr 11.5-14.5% – Ni 0.50% max (Penn Stainless; SSINA gives 0.6%) – Al 0.10-0.30% – balance Fe. EN 10088 for 1.4002 (worldstainless): C 0.08% max – Si 1.00% max – Mn 1.00% max – P 0.040% max – S 0.015% max – Cr 12.0-14.0% – Al 0.10-0.30% – balance Fe. THE TWO STANDARDS ARE NOT THE SAME: the chromium band is 11.5-14.5% in ASTM and 12.0-14.0% in EN, and the sulfur ceiling is lower in EN. The aluminium band of 0.10-0.30% is the same in four independent sources (SSINA, worldstainless, BSSA, Penn Stainless).<\/p>\n
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Not to be confused with<\/div>\n

AISI 410<\/a><\/div>\n<\/div>\n<\/div>\n

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For what<\/div>\n
Bought for 12-13% chromium fabrications that are welded and then cannot be annealed. Penn Stainless describes the grade as ‘designed to be used in the as-welded condition’ and lists steam nozzles, partitions, annealing boxes and ‘fabrications that cannot be annealed after welding’.<\/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: NONE. The AMS column of the Type 405 (S40500) row in the SSINA type\/specification table is EMPTY. ASTM (the full list from the SSINA Type 405 row): A240 \/ A240M (plate, sheet, strip) \u00b7 A268 (seamless and welded ferritic tubing) \u00b7 A276 (bars and shapes) \u00b7 A473 (forgings) \u00b7 A479 \/ A479M (bars for boilers and pressure vessels) \u00b7 A511 (seamless mechanical tubing) \u00b7 A580 (wire) \u00b7 A1012 (condenser tubes). ASME: SA-240 \u00b7 SA-268 \u00b7 SA-479. EN: 1.4002 \u00b7 EN 10088-2 (flat products) \u00b7 EN 10088-3 (long products). SAE type number: 51405. Military: QQ-S-763.
THE AMS 5504 TRAP: AMS 5504 DOES NOT BELONG TO THIS ALLOY. In the SSINA specification table AMS 5504 appears on the Type 410 row; the AMS list for Type 410 is 5350, 5504, 5505, 5591, 5613, 5776, 5777 and 5876.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
It can be used on parts that are welded and then cannot be annealed. The aluminium band of 0.10-0.30% is the same in four independent sources (SSINA, worldstainless, BSSA, Penn Stainless).<\/div>\n<\/div>\n
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Welding<\/div>\n
Welding is the reason this grade exists. The SSINA welding handbook gives a columbium (niobium) stabilised filler metal for Type 405 and states that columbium additions reduce intergranular precipitation. Preheat: 150-230 \u00b0C (300-450 \u00b0F) for sections of roughly 6 mm (1\/4 inch) and heavier;<\/div>\n<\/div>\n
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Limits<\/div>\n
1) IT DOES NOT HARDEN BY HEAT TREATMENT and its strength is the lowest in the family: ASTM minima of 170 MPa yield \/ 415 MPa tensile (SSINA, Penn Stainless). If strength is wanted, this is the wrong grade. 2) THE CHROMIUM IS LOW: 11.5-14.5% (ASTM) or 12.0-14.0% (EN).<\/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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