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我厂常用细长杆类零件,如顶件杆。这种零件以前热处理最大缺陷是变形量大,硬度低,有时变形达0.3～0.4毫米。而45＃钢的淬火硬度,据兄弟单位的调查,只能达Rc47度左右。我们认为这种细长零件热处理淬火的关键在于冷却剂和冷却温度。我们遵照毛主席“差异就是矛盾”的教导,大胆对冷却剂进行分析比较,采用了“硝盐粥样固熔体冷却法”进行细长零件的淬火处理,很快得到了较好的效果。硝盐成份为硝酸钾55％,亚硝酸钠45％,再
I plant commonly used slender rod parts, such as the top rod. The biggest drawback of this part of the heat treatment before the deformation is large, low hardness, and sometimes deformation of 0.3 to 0.4 mm. The 45 # steel quenching hardness, according to the investigation of the brothers unit, only about Rc47 degrees. We think the key to the heat treatment of this slender part is the coolant and the cooling temperature. In accordance with the teaching of Chairman Mao, “Differences are contradictions”, we boldly analyzed and compared the coolant. The quenching treatment of slender parts was carried out using the “salt-porridge-like solid solution cooling method”, and a good effect was quickly obtained. Nitrate salt composition of 55% potassium nitrate, 45% sodium nitrite, and then