TH550-NQ-Ⅱ耐候焊丝钢热轧盘条的开发生产实践  

Development and production practice of hot-rolled wire rod of TH550-NQ-Ⅱweather-resistant welding wire steel

作　　者：孙浩源[1] SUN Haoyuani(Tangshan Iron and Steel Group Co.,Ltd.,Tang Shan 063000,Hebei,China)

机构地区：[1]唐山钢铁集团有限责任公司,河北唐山063000

出　　处：《四川冶金》2024年第6期31-35,共5页Sichuan Metallurgy

摘　　要：唐钢利用现有工艺装备,生产试制TH550-NQ-Ⅱ耐候焊丝钢盘条。转炉冶炼成分终点控制:C 0.03%~0.07%,P≤0.012%,S≤0.025%;LF精炼40~65 min,软吹氩时间≥10 min;连铸采用全流程保护浇注及结晶器电磁搅拌、末端电搅技术,铸坯恒拉速控制在2.1 m/min;加热炉均热段温度1000~1150℃,开轧温度1010~1050℃,精轧入口温度900~930℃,终轧温度930~960℃,吐丝温度870~890℃,终轧速度94~98 m/s。热轧状态φ6.5 mmTH550-NQ-Ⅱ盘条抗拉强度487~506 MPa,断后伸长率42.4%~50.2%,断面收缩率80.5%~85.2%;金相组织主要为铁素体(F)+珠光体(P),成品性能通条稳定性好,成品尺寸满足C级精度,表面质量好。产品质量完全满足用户使用要求。Tangshan iron and steel co.,ltd.uses the existing technology and equipment to produce and trial-produce TH550-NQ-Ⅱweather-resistant welding wire steel wire rod.Terminal control of converter smelting components:C 0.03%~0.07%,P≤0.012%,S≤0.025%;LF refining for 40~65 min,soft argon blowing time≥10 min;Continuous casting adopts the whole process of protective pouring,electromagnetic stirring of crystallizer and electric stirring at the end,and the casting speed is controlled at 2.1 m/min.The soaking section temperature of the heating furnace is 1000~1150℃,the initial rolling temperature is 1010~1050℃,the finishing rolling inlet temperature is 900~930℃,the finishing rolling temperature is 930~960℃,the spinning temperature is 870~890℃,and the finishing rolling speed is 94~98 m/s.The tensile strength ofφ6.5 mm T550-NQ-Ⅱwire rod in hot rolled state is 487~506 MPa,the elongation after breaking is 42.4%~50.2%,and the area shrinkage is 80.5%~85.2%.The metallographic structure is mainly ferrite(F)+pearlite(P),and the finished product has good stability,the finished product size meets the C-level accuracy and the surface quality is good.The product quality fully meets the user's requirements.

关 键 词：TH550-NQ-Ⅱ耐候焊丝钢 产品开发 金相组织 力学性能 

分 类 号：TF762[冶金工程—钢铁冶金] TG335.11[金属学及工艺—金属压力加工]