1981年7月2～4日湖南省科委在长沙主持召开了激光硬化活塞环的技术鉴定会。来自全国33个单位的54名代表一致认为:“激光硬化新技术首次成功地应用于零件表面处理,填补了國内空白,具有先进水平;激光硬化活塞环使用寿命比普通环提高一倍,与喷钼环相当;激光硬化活塞环与镀铬环、喷钼环相比较具有成本低、节约能 July 2, 1981 Hunan Science and Technology Commission held in Changsha, presided over the laser-hardened piston ring technology appraisal. 54 representatives from 33 units all over the country agreed that: "The first laser hardening technology successfully applied to parts surface treatment for the first time, which has filled the domestic gap with the advanced level; the life of laser hardened piston rings is doubled that of ordinary rings, and Spray molybdenum ring quite; laser hardened piston ring and chrome ring, molybdenum ring spray ring compared with low cost, energy saving