Today we are going to understand the function of heat resistant steel castings and analyze the elements and their functions.

Elements formed by ferrite such as chromium, aluminum and silicon can promote the formation of dense oxide film on the metal surface at high temperature to prevent further oxidation, and are the main elements for improving the oxidation resistance of steel and resisting high-temperature gas corrosion. However, the high content of aluminum and silicon will seriously deteriorate the room temperature plasticity and thermoplasticity. Chromium can significantly increase the recrystallization temperature of low alloy steel. When the content is 2%, the strengthening effect is the best.

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