正确选择和使用淬火介质是提高热处理零件质量的重要手段。随着对三硝水溶液的推广应用,我们在这方面做了一些尝试。积累一些经验,取得了较好的经济效果。一、尝试我厂热处理的主要产品是汽车零件。按传统习惯,对40Cr、20Cr、18CrMnTi等合金结构钢,以20号机油为淬火介质;对45钢、35钢等碳素结构钢,则以10％NaCl水溶液作为淬火介质。如汽缸盖螺栓(见图1)、前制动器制动蹄支撑销(见图2),材料均为 Correct choice and use of quenching media is an important means to improve the quality of heat-treated parts. With the popularization and application of TNN solution, we have made some attempts in this respect. Accumulate some experience and achieved good economic results. First, try my factory heat treatment is the main product of auto parts. According to the traditional custom, the 40Cr, 20Cr, 18CrMnTi and other alloy steel, 20 oil as the quenching medium; 45 steel, 35 steel and other carbon structural steel, the 10% NaCl aqueous solution as a quenching medium. Such as the cylinder head bolts (see Figure 1), the front brake shoe support pin (see Figure 2), the material is