{"id":3669,"date":"2026-09-16T11:16:24","date_gmt":"2026-09-16T08:16:24","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-304\/"},"modified":"2026-09-25T21:15:35","modified_gmt":"2026-09-25T18:15:35","slug":"aisi-304","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-304\/","title":{"rendered":"AISI 304 \/ (1.4301)"},"content":{"rendered":"

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AISI 304 \/ (1.4301) \/ UNS S30400 \/ AMS 5511 \/ AMS 5513<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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AISI 304<\/div>\n
UNS S30400 \u00b7 W.Nr. 1.4301 \u00b7 X5CrNi18-10 \u00b7 17.5-20.0% Cr \u2013 8.0-10.5% Ni \u2013 C \u2264 0.07% (ASTM A240, EN 1.4301) or \u2264 0.08% (ASTM A276, A312, A213, A182) \u2013 balance Fe. It is an austenitic stainless steel: NOT PRECIPITATION HARDENABLE, it cannot be hardened by heat treatment; strength is raised only by cold work.<\/div>\n
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Not to be confused with<\/div>\n

AISI 316<\/a>AISI 304L<\/a>AISI 430<\/a>AISI 303<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
Bought for general-purpose parts that need corrosion resistance in atmospheric and mildly chemical environments together with formability: tank and vessel bodies, piping, structural and decorative members, food and beverage equipment.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 flat bar \u00b7 plate \u00b7 sheet \u00b7 pipe and tube \u00b7 forging. All forms supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 5513<\/b> (sheet, strip, plate) \u00b7 AMS 5639<\/b> (bar, wire, forgings, mechanical tubing, rings) \u00b7 AMS 5560<\/b> (seamless tubing) \u00b7 AMS 5565<\/b> (welded tubing). ASTM: A240 \/ SA-240 (plate, sheet, strip) \u00b7 A276 \/ SA-276 and A479 \/ SA-479 (bar and shapes) \u00b7 A312 \/ SA-312 (pipe, TP304) \u00b7 A213 \/ SA-213 and A249 (tube, TP304) \u00b7 A182 \/ SA-182 (forged flanges and fittings, F304) \u00b7 A403 (fittings, WP304) \u00b7 A580 (wire) \u00b7 A484 (general requirements). EN: 10088-2, 10088-3, 10028-7, 10216-5, 10217-7, 10222-5, 10272.
The AMS numbers are SEPARATE for 304 and 304L. AMS 5513 belongs to 304 and AMS 5511 to 304L; AMS 5639 belongs to 304 and AMS 5647 to 304L. Mixing these four numbers up is the most common specification error in the field.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
A yield minimum 35 MPa higher than 304L: 205 MPa against 170 MPa in ASTM A240, and 515 MPa against 485 MPa in tensile. In the same specification the elongation minimum (40%) and the hardness ceiling (201 HBW \/ 92 HRB) are identical for both grades, so this gain is not paid for in ductility or\u2026<\/div>\n<\/div>\n
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Welding<\/div>\n
Filler metal: AWS E308 \/ ER308, E308L \/ ER308L; AK Steel also lists 347. NO PREHEAT IS REQUIRED \u2014 the austenitic structure shows no transformation hardening. ASME Section IX P-No 8 (austenitic stainless).<\/div>\n<\/div>\n
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Limits<\/div>\n
CHLORIDE STRESS CORROSION CRACKING: under tensile stress in a chloride-bearing environment it cracks above roughly 60 \u00b0C. Atlas Steels, thyssenkrupp, Aalco, Alleima and the buymetal grade sheet give this threshold as about 60 \u00b0C; Outokumpu says about 50 \u00b0C and ATI about 49 \u00b0C (120 \u00b0F) \u2014 NO SINGLE NUMBER IS GIVEN;<\/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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