Stainless Steel — Austenitic, Martensitic, Ferritic, Duplex, PH

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33 alloys

AISI 303UNS S30300 · W.Nr. 1.4305 · X8CrNiS18-9 · BS 303S31 / EN 58M AISI 304UNS S30400 · W.Nr. 1.4301 · X5CrNi18-10 AISI 304LUNS S30403 · W.Nr. 1.4307 · X2CrNi18-9 AISI 310UNS S31000 (310) and UNS S31008 (310S) · W.Nr. 1.4845 · X8CrNi25-21 AISI 314UNS S31400 · W.Nr. 1.4841 · X15CrNiSi25-21 AISI 316UNS S31600 · W.Nr. 1.4401 · X5CrNiMo17-12-2 AISI 316LUNS S31603 · W.Nr. 1.4404 · X2CrNiMo17-12-2 AISI 316TiUNS S31635 · W.Nr. 1.4571 · X6CrNiMoTi17-12-2 AISI 321UNS S32100 · W.Nr. 1.4541 · X6CrNiTi18-10 AISI 904LUNS N08904 · W.Nr. 1.4539 · X1NiCrMoCu25-20-5 Nitronic 50UNS S20910 · ASTM XM-19 · W.Nr. 1.3964 (SEW 390)AISI 410UNS S41000 · W.Nr. 1.4006 · X12Cr13 AISI 415UNS S41500 · W.Nr. 1.4313 · X3CrNiMo13-4 · ASTM F6NM AISI 416UNS S41600 · W.Nr. 1.4005 AISI 420UNS S42000 · W.Nr. 1.4021 · X20Cr13 AISI 420BUNS S42000 · W.Nr. 1.4028 · X30Cr13 · designated 420B in ASTM F899 AISI 420CUNS S42000 · W.Nr. 1.4034 · X46Cr13 · designated 420C in ASTM F899 AISI 430FUNS S43020 AISI 431UNS S43100 · W.Nr. 1.4057 · X17CrNi16-2 AISI 440CUNS S44004 · W.Nr. 1.4125 AISI 405UNS S40500 · W.Nr. 1.4002 · X6CrAl13 AISI 430UNS S43000 · W.Nr. 1.4016 · X6Cr17 AISI 434UNS S43400 · W.Nr. 1.4113 · X6CrMo17-1 AISI 318UNS S32205 · W.Nr. 1.4462 · X2CrNiMoN22-5-3 AISI 329UNS S32900 · W.Nr. 1.4460 AISI F53UNS S32750 · W.Nr. 1.4410 · X2CrNiMoN25-7-4 AISI F55UNS S32760 · W.Nr. 1.4501 · X2CrNiMoCuWN25-7-4 AISI F255UNS S32550 · W.Nr. 1.4507 13-8 PHUNS S13800 · W.Nr. 1.4534 · X3CrNiMoAl13-8-2 · ASTM Grade XM-13 15-5 PHUNS S15500 · W.Nr. 1.4545 · ASTM XM-12 · X5CrNiCu15-5 (X5CrNiCuNb15-5 in some sources)17-4 PHUNS S17400 · W.Nr. 1.4542 · X5CrNiCuNb16-4 · AISI/Type 630 17-7 PHUNS S17700 · W.Nr. 1.4568 · X7CrNiAl17-7 · AISI/SAE 631 Custom 455UNS S45500 · W.Nr. 1.4543 · X3CrNiCuTiNb12-9 · ASTM Type XM-16

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STAINLESS STEELS

Stainless steels are the family of steels containing at least 10.5% chromium, which resist corrosion thanks to the thin chromium oxide layer that forms spontaneously on their surface. When this passive layer is scratched or machined it re-forms by itself in the presence of oxygen; that is the fundamental property separating stainless steel from ordinary steel.‌‌

Stainless steels are divided into groups according to their crystal structure, and each group strikes a different balance between strength, toughness, formability and corrosion resistance. The chromium, nickel, molybdenum, nitrogen and carbon contents determine that balance, and choosing the right group is often more important than choosing the right grade.

Defence Metal supplies stainless steel to the aerospace, defence, energy, chemical and general manufacturing sectors. Material is supplied with certification, to the standards and sizes requested.‌‌

WHICH GROUP SHOULD YOU CHOOSE

If corrosion resistance and formability are your priority, austenitic steels are the answer; if you need a material that can be hardened by heat treatment and resists wear, martensitic steels are suitable. For an economical nickel-free solution there are ferritic steels; for applications needing high strength together with chloride resistance, duplex steels; and in more aggressive seawater environments, super duplex steels. If high strength is required through ageing after machining, precipitation hardening steels should be considered.‌‌

STAINLESS STEEL GROUPS

If you are not sure which group suits your application, or would like to share your size, standard and certification requirements, contact us.‌‌

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