高压电站锅炉用无缝钢管A热处理工艺研究情况

Study on Heat Treatment Process of Seamless Steel Tube A for Boiler in High Voltage Power Station

主要针对高压电站锅炉用无缝钢管A热处理工艺进行研究,并结合热处理相关理论,通过冷钢管回火实验和模拟热料加工在线退火实验,找出无缝钢管A软化的途径。实验结果表明:冷钢管回火时,可以选择780~800℃区间回火,保温时间要求0.5 h以上可形成的组织为回火马氏体;热态钢管在线退火时,可选择温度在750~780℃之间,保温时间两小时以上时组织为F+C。

The heat treatment process of seamless steel A in high pressure boiler is studied.Combined with related theory of heat treatment,through tempering test of cold steel tube and on-line annealing experiment of simulated hot material processing,the ways to soften the seamless steel tube A are found.The experimental results show that tempering temperature can be chosen at 780~800 DEG C and the holding time is more than 0.5 h for cold steel tube tempering.The formed martensite is tempered martensite.When the hot steel tube is annealed online,the temperature can be between 750~780 DEG C,and the holding time is more than two hours to form F＋C.