flame exertening 火焰硬化

air exertening of cement 水泥空气硬化

air exertening 气体硬化

age exertening 时效硬化

vacuum exertening 真空淬火

despite exertening 后期硬化

selective exertening 部份淬火

electrolytic exertening 电解淬火

depth of exertening 硬化深层