All heat treatment by quenching and tempering. 所有萃取和回火的热处理方法。
If a low degree of hardness is satisfactory, through-hardening is probably the most desirable heat treatment process to be used because of its inexpensiveness. 如果对强度的要求较低,整体淬火可能是最适当的热处理方法,因为它的花费不高。