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对于形状复杂,且要求具有较高硬度和强韧性的工、模具,可进行等温淬火,得到下贝氏体组织。其淬火工艺一般是将钢件淬火至稍高于M。点温度的硝盐浴或碱浴中,保温足够的时间,使其发生下贝氏体相变,而后在空气中冷却。对于碳素工具钢来说,这种方法用于尺寸较小的薄、细工件。例如,用T 7钢制造的螺丝刀,原用820℃淬火加210℃低温回火,其硬度高于HRC 55,但韧性不够,在使用中扭到9°～11°时就发生脆断。而
For the complex shape, and requires a higher hardness and toughness of the workers, molds, can be austempered to obtain lower bainite. The quenching process is generally quenched steel slightly higher than M. At a temperature of salt bath or in an alkaline bath, allow enough time for it to undergo a lower bainite transformation and then cool in air. For carbon tool steel, this method is used for smaller thin, thin workpieces. For example, a screwdriver made of T 7 steel, originally tempered at 820 ° C and tempered at 210 ° C, has a hardness higher than HRC 55 but not ductile enough to break brittle when twisted between 9 ° and 11 ° during use. and