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1推广应用新型淬火介质的意义新型淬火介质通常指各种专用淬火油和优质水溶性淬火剂。和普通机油相比，专用淬火油具有更强的冷却能力、更合理的冷却速度分布、更长的使用寿命，或者更能保持工件的光亮性。优质水性淬火剂能不同程度地降低钢件在水中淬火时的低温冷却速度，因而
1 promote the use of a new type of quenching medium significance New quenching medium usually refers to a variety of special quenching oil and high quality water-soluble quenching agent. Compared with ordinary oil, special quenching oil has more cooling capacity, more reasonable cooling rate distribution, longer service life, or more to maintain the brightness of the workpiece. High-quality water quenching agent to different degrees to reduce the quenching of steel in the low-temperature cooling rate, and therefore