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  1. It can be hardened by heat treatment
  2. They contain a high quantity of chromium
  3. It is suitable for use in a corrosive, fairly high-temperature environment
  4. The austenitic phase is stabilized at room temperature by addition of nickel
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Option 1 : It can be hardened by heat treatment

Austenitic stainless steel is a specific type of stainless steel alloy. Stainless steels may be classified by their crystalline structure into three main types: austenitic, ferritic, and martensitic. Austenitic stainless steel contains a minimum of 16% chromium and 6% nickel.

Austenitic Stainless Steels — Conventional austenitic stainless steels will work harden with cold working, but cannot be hardened by heat treatment. Annealing is employed to optimize corrosion resistance, softness, and ductility.

Ferritic Stainless Steels — Ferritic stainless steels are not hardened by quenching. The only heat treatment applied to ferritic is annealing because they develop minimum hardness and maximum ductility, impact toughness, and corrosion resistance in the annealed and quenched condition.

Martensitic Stainless Steels — The maximum hardness achievable in martensitic stainless steels depend primarily on their carbon content.
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