用55%KCl+45%NaCl作为基础盐，以“603”无毒液体渗碳剂添加适量的NH4Cl和微量的镧系氯化稀土等均匀混合后制成“混合渗剂”，首先在实验室内对20钢纺织钢领进行了不同温度和时间的CNRE共渗试验。对试验结果进行了表面质量、变形、硬度、金相和剥层分析后，优化出工艺参数，即在860 ℃下共渗25 h后直接淬火，再于140~150 ℃下低温回火15 h。随后，在重庆润丰纺织机械公司热处理车间进行了中试，将中试产品用于上车试验，取得了成功。最后，在100 kW中温盐浴炉上对该产品投入了批量生产。从而，淘汰了原来的气体渗碳后缓冷，再用70%NaCN+30%NaCl盐浴重新加热淬火并进行140~150 ℃低温回火的较为繁琐、不经济和有剧毒的工艺制度。
Basic salt mixture is composed of 55%KCl and 45%NaCl, “mixing cementation agent” is prepared by mixing “603” nonpoisonous liquid cementation agent with some NH4Cl and a minute amount of lanthanide rareearth chloride, which are mixed uniformly. Firstly, the experiment of CNRE carbonitriding for 20 steel textile ring at different temperatures and times is conducted. After analyzing surface quality, deformation, hardness, metallic phase and breadcrust inspection, optimizing technological parameterquenching after carbonitriding at 860 ℃ for 25 hours and tempering at 140-150 ℃ for 15 hours can be found. Secondly, heat treatment department of Chongqing Runfeng textile Machine Corporation had produced some textile rings and succeeded in the trial running. Finally, a large amount of textile rings has been produced by 100 kW medium temperature saltbath furnaces, Consequently, numerous, uneconomical and virulent technological system including slow cooling after gas carbonitriding, reheating it with 70%NaCN saltbath and quenching, then tempering at 140-150 ℃ was washed out.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%