Quenched and tempered steel carbon content ranging from 0.27 to 0.50%. Carbon quenched and tempered steel, the carbon content close to the upper limit, such as 40,45,50 steel; alloy quenched and tempered steel is relatively close to the lower, 40Cr, 30CrMnTi, steel and so on.

Containing alloying elements Cr, Ni, Mn, Ti alloy quenched and tempered steel, its main role is to improve the steel hardenability the sorbite organization and quenched and tempered after strengthened. The content of alloying elements in the quenched and tempered steel ferrite can be strengthened without significantly reducing its toughness, even some can improve its toughness. Alloying elements such as Mo, V, Al, B in the quenched and tempered steel, and its content is generally less, especially in the content of B is very slightly. Mo played the main role is to prevent the alloy quenched and tempered steel in high temperature tempering the second class Xianghuo brittle; role of V is a to hinder high temperature austenite grain growth; Al's main role is to accelerate the alloy quenched and tempered steel nitriding process; trace amounts of B strongly isothermal transformation curve to the right, significantly improve the alloy quenched and tempered steel hardenability.



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