What's secondary quenching of steel shot china products

- Apr 04, 2018 -

Secondary queching of steel shot china products is in in carbon and alloy elements (with the exception of Co and Al) more residual austenite after quenching in steel, high alloy steel, for example, high speed steel after quenching residual austenite is as high as 25% ~ 30%.Residual austenite in alloy steel in 200 ~ 300 ℃ tempering to F) (ferrite and carbide).


But in the high alloy steel quenching at 500 ~ 600 ℃ in precipitation in the austenite, carbide alloy elements in the austenite content is reduced, and the transformation of austenite to martensite temperature mentioned above room temperature, so the austenite into martensite after cooling, so as to improve the hardness of steel shot china products.The phenomenon of residual austenite transition to martensite in high alloy steel is called secondary quenching.Secondary quenching occurs in high speed steel and high chromium steel.


For steel with more alloy elements, there is an intermediate stabilizer between the pearlite and the C curves of the transformation of the bainite body.Similarly, the residual austenite of this type of steel also appears in the intermediate stabilization zone between the two transitions at the corresponding temperature tempering.Will, however, this kind of hardened steel tempering heat to the area between the upper limit of temperature, the retained austenite transformed into pearlite, neither nor turn bainite, but continues to transform into martensite when cooled to room temperature.This effect is called secondary quenching of steel shot china products.

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