Austenitizing

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Definition - What does Austenitizing mean?

Austenitizing is one of the heat treatment processes of steel and other ferrous alloys where these materials are heated above their critical temperatures long enough for transformations to take place. If an austenitized material is followed by a quenching process, then this material becomes hardened. Quenching is performed at a rate that is fast enough to transform the austenite into martensite.

Corrosionpedia explains Austenitizing

The purpose of austenitizing steel and other ferrous alloys is to transform them into the required shape and to provide strength and resistance to the material. The temperature at which the steel and ferrous alloys are heated above their critical temperatures is called the austenitizing temperature. Generally the austenitizing temperature ranges from 400 °C (752 °F) to 800 °C (1472 °F) for different grades of carbon, alloys and tool steels. Once the austenitizing temperature is attained, proper microstructure and full hardness of steel in further heat treatment processes can be attained.

Steel and ferrous alloys can be set into either:

  • A partial austenitizing state when they have attained partial transformation at an initial austenite temperature close to 300 °C (572 °F).
  • A complete austenitizing state when they have attained partial transformation at necessary austenite temperature within 400 °C (752 °F) to 800 °C (1472 °F) depending on the grade of the steel.

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