Stainless steel chemical compositions.


The chemical compositions for some commonly used austenitic, ferritic, martensitic, precipitation hardening and duplex stainless steels are provided in the following tables. When specifying stainless steel chemistry, it is important to reference the appropriate ASTM standard and the UNS (Unified Numbering System) number associated with the specific alloy or grade. UNS numbers are internationally recognized specific chemistry requirements. If common names such as AISI numbers are referenced, the UNS number should also be used to avoid confusion.

These compositions exclude phosphorus (P), sulfur (S), and silicon (Si). Chemical composition requirements may vary with the specific product requirements so please refer to the appropriate specification.

Austenitic Stainless Steels %
AISI DIN C Cr Ni Mo N Mn Cu Other
201 1.4372 0.15 16.0-18.0 1.25-5.5 - 0.25 5.50-7.50 0.80 -
301 1.4310 0.15 16.0-18.0 6.0-8.0 - 0.10 2.00 - -
304L 1.4307 0.030 17.5-19.5 8.0-12.0 - 0.10 2.00 - -
321 1.4541 0.08 17.0-19.0 9.0-12.0 - 0.10 2.00 - Ti 5x(C+N)
309 1.4828 0.08 22.0-24.0 12.0-15.0 - - 2.00 - -
310S 1.4845 0.08 24.0-26.0 19.0-22.0 - - 2.00 - -
316L 1.4404 0.030 16.0-18.0 10.0-14.0 2.00-3.00 0.10 2.00 - -
Ferritic Stainless Steels %
AISI DIN C Cr Ni Mo N Mn Cu Other
409 1.4512 0.030 10.5-11.7 0.50 - 0.030 1.00 -

Ti 6x(C+N) to .50

Cb 0.17

430 1.4016 0.12 16.0-18.0 0.75 - - 1.00 - -
434 1.4113 0.12 16.0-18.0 - 0.75-1.25 - 1.00 - -
444 1.4521 0.025 17.5-19.5 1.00 1.75-2.50 0.035 1.00 - (Ti+Cb) [0.20+4(C+N)] to 0.80 max.
Martensitic Stainless Steels %
AISI UNS C Cr Ni Mo N Mn Cu Other
410 S41000 0.08-0.15 11.5-13.5 0.75 - - 1.00 - -
420 S42000 0.15 min. 12.0-14.0 0.75 0.50 - 1.00 - -
440A S44002 0.60-0.75 16.0-18.0 - 0.75 - 1.00 - -
440C S44004 0.95-1.20 16.0-18.0 - 0.75 - 1.00 - -

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