工厂中在消灭工具因裂纹而生的废品时,常常没有考虑到在淬火後立时回火的重要性。往往要积累了一批工具,才装入回火炉中。淬火和回火工序之间中断的时间有几小时甚至於几天的。工具停留在淬硬状态下是很危险的,在实际上有大部分碳素工具钢裂成的工具,并不是在硬化过程中(加热与 Frequently, the importance of tempering immediately after quenching has often not been taken into account at the factory to eliminate scrap resulting from tool cracks. Often have to accumulate a number of tools, before loading furnace. Quenching and tempering between the interruption of a few hours or even days. Tools stay in the hardened state is very dangerous, in fact, most of the carbon tool steel cracking tool, not in the hardening process (heating and