20钢平垫圈的热处理  

Heat Treatment of 20 Steel Flat Washer

作　　者：刘春燕[1] 李敬民[1] 

机构地区：[1]中国工程物理研究院机械制造工艺研究所,四川绵阳621900

出　　处：《热处理》2016年第6期38-40,共3页Heat Treatment

摘　　要：20钢平垫圈要求达到≥200 HV10的硬度,正火不可能达到这一硬度,必须进行淬火、回火处理。为了优化平垫圈的热处理工艺,对20钢进行了淬火、回火工艺试验。结果表明,适合平垫圈的处理工艺为920℃×35 min,盐水冷却,随后300℃×2 h空冷回火。此外,还改进了平垫圈的淬火方法,即将平垫圈悬挂在盐水槽中冷却,结果,平垫圈的硬度达到了要求,最高提高了1倍。A type of flat washer,made of 20 steel,was required to have as hardness as 200 HV10 or more.The flat washer must be hardened and tempered because of the desirable hardness being impossible to be reached by normalizing.The 20 steel was subjected to trial hardening and tempering to obtain a heat treatment process applicable to the flat washer.The results indicate that the heat treatment practice suitable to the flat washer is austenitizing at 920 ℃for 35 min,and quenching in brine followed by tempering at 300 ℃for 2 h and air-cooling. Apart from this,the operation in quenching of the flat washer was improved,that is,the flat washers were suspended in brine bath during the quenching.As a result,the hardness of the flat washer not only conformed with the requirement but also increased by twice at most.

关 键 词：20钢 平垫圈 淬火 硬度 

分 类 号：TG627.9[金属学及工艺—金属切削加工及机床]