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Tuesday, February 22, 2011

Classification of steels by application

Stainless steels:
AISI has established three-digit system for the stainless steels:
2XX series – chromium-nickel-manganese austenitic stainless steels;
3XX series – chromium-nickel austenitic stainless steels;
4XX series – chromium martensitic stainless steels or ferritic stainless steels;
5XX series – low chromium martensitic stainless steels;

Tool and die steels:
Designation system of one-letter in combination with a number is accepted for tool steels.
The letter means:
W - Water hardened plain carbon tool steels;
O - Oil hardening cold work alloy steels;
A - Air hardening cold work alloy steels;
D -Diffused hardening cold work alloy steels;
S – Shock resistant low carbon tool steels;
T – High speed tungsten tool steels;
M - High speed molybdenum tool steels;
H – Hot work tool steels;
P – Plastic mold tool steels.

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