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一、前言过去的试验研究已表明,无论在低炭、中炭含硼的还是不含硼的合金结构钢轧材及其锻件正火后,均会发生和存在程度不同的贝氏体类组织,常被称为“非正常组织”。由于它的存在与分布,给切削加工造成困难。同时提出了20MnVB钢齿轮,可降低正火温度到870℃,能获得要求的硬度范围,较为正常和均匀的组织,从而改善切削加工性能,有利于齿轮生产顺利进行。由于降低了正火温度,可大大节省正火时电能消耗,延长加热炉的电阻带和工装
I. PREFACE Past experimental studies have shown that both in the low-carbon, carbon-containing boron or non-boron alloy steel and its forgings after normalizing will occur and there are different degrees of bainite type organization , Often referred to as “abnormal organization.” Because of its existence and distribution, to the cutting processing difficulties. At the same time, 20MnVB steel gear was proposed to reduce the normalizing temperature to 870 ℃, to obtain the required hardness range, more normal and uniform structure, so as to improve the machining performance and facilitate the smooth gear production. As a result of lower normalizing temperature, the energy consumption during normalizing can be greatly saved, and the resistance zone and tooling of the heating furnace can be prolonged