Quenching is a common heat treatment process. It is the metal heat treatment process in which the ASTM A709 high strength steel metal workpiece is heated to a proper temperature and kept for a period of time, then immersed in the quenching medium for rapid cooling. Quenching can improve the strength and hardness of steel in a large range, and adjust the coordination between ASTM A709 high strength steel strength and hardness, plasticity and toughness. Quenching is generally used as the final heat treatment.
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Chromium element (Cr element) can improve the strength and hardness of ASTM A709 high strength steel, carbon steel in rolling state, reduce elongation and area reduction. When the chromium content is more than 15%, the strength and hardness will decrease, while the elongation and reduction of area will increase correspondingly. It is easy to obtain high surface processing quality for steel parts containing chromium after grinding. The main function of chromium element (Cr element) in quenched and tempered steel structure is to improve hardenability, so that the steel has better comprehensive mechanical properties after quenching and tempering.
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