How is austenitic steel obtained at room temperature since in the Iron Carbon diagram we see it above the critical temperature ?

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M. Balakrishnan

Dear Karthik Gopal,

Its very simple to understand from, Fe-Ni phase diagram, where you can not have the chances of multiple phase transformation. From liquidus temperature to room temperature austenite is possible. Please refer about manufacturing of stainless steel related books too. This will help you to understand further.

Santanu Kr Ray

It is not possible to stabilise austenite at room temperature in plain Fe-C system .

Austenite can be stable at room temperature only in presence of austenite-stabilising elements , e.g. Ni and / or Mn in adequate quantity .