The heating temperature for austenitization during the hardening treatment will be minimum for a plain carbon steel having
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Austenitization temperatures for both are same for hardening heat treatment. (a) being an eutectoidsteel will have homogeneous austenite before quenching. ... Forplain carbon steel it is around 720⁰C. To get martensite the steelshould be heated beyond thistemperature.
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