对35■■钢来说,普通的调质处理不能使它获得很高的韧性。最近我们用正火后调质,进一步细化钢中的微粒纯铁体,显著地提高了35钢的韧性,从而使它可以完全代替40ヵセ钢。试验的情况是这样的: 把厚度是11～12公厘的试样在1030～1050℃下保温5分钟,取出后在空气里冷却;正火后的试样在830～850℃淬火(淬火剂是油),然后分别以不同的温度进行回火,所获得的机械性能如下表。 For 35 ■■ steel, ordinary quenching does not give it high toughness. Recently, we use the normalizing and tempering, to further refine the fine iron in the steel, significantly improving the toughness of 35 steel, so that it can completely replace the 40 ヵ セ steel. The test is carried out as follows: a sample having a thickness of 11 to 12 mm is held at a temperature of 1030 to 1050 ° C for 5 minutes and taken out and air-cooled; a sample after normalizing is quenched at 830 to 850 ° C Is oil), and then were tempered at different temperatures, the mechanical properties obtained are as follows.