淬火与回火 meaning in English

hardened and tempered

Quenching and tempering of steel parts
钢件的淬火与回火
Standard specification for high - yield - strength , quenched and tempered alloy steel plate , suitable for welding
焊接用经淬火与回火的高屈服强度合金钢板的标准规范
Standard specification for quenched and tempered alloy steel bolts , studs , and other externally threaded fasteners
淬火与回火合金钢螺栓螺柱及其他外螺纹紧固件标准规范