Quenching St60-2 steel after tempering performance depends on its internal microstructure; St60-2 steel microstructure and its chemical composition, quenching process and tempering process. With the increase of tempering temperature,St60-2 steel tensile strength decreased; Yield strength was slightly increased first and then decreased; Reduction of area and elongation continue to improve.
In order to obtain good comprehensive mechanical properties, alloy structural steel is often in three different tempering temperature range: ultra high strength steel in 200 ~ 200 ℃; Near the spring steel at 460 ℃; Quenched and tempered steel in 550 ~ 650 ℃ tempering.
Carbon and alloy tool steel with high hardness and high strength, tempering temperature does not exceed 200 ℃. When tempering with secondary hardening alloy structural steel, high speed steel and die steel are within the range of 500 ~ 650 ℃ tempering.
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