What are the classifications of stainless steel materials?

Stainless steel is the abbreviation of stainless acid-resistant steel, so what are the material classifications of stainless steel? Let me introduce it to you, I hope it can be helpful to everyone.
Stainless steel materials are classified as follows:
1. Classification of chemical components:
Basically, it can be divided into two systems: chromium stainless steel (such as ferrite series, martensitic series) and chromium-nickel stainless steel (such as austenitic series, abnormal series, precipitation hardening series).
2. Metallographic structure classification:
Can be divided into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, duplex stainless steel, precipitation hardening stainless steel.
3. Classification according to corrosion resistance type:
It can be divided into stress corrosion resistant stainless steel, pitting corrosion resistant stainless steel, intergranular corrosion resistant stainless steel, etc.
4. Classification according to functional characteristics:
It can be divided into free-cutting stainless steel, non-magnetic stainless steel, low-temperature stainless steel, and high-strength stainless steel.