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-Ⅱ weather-resistant welding wire steel
孙浩源1
作者信息
- 1. 唐山钢铁集团有限责任公司,河北唐山 063000
- 折叠
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.
Abstract
Tangshan iron and steel co.,ltd.uses the existing technology and equipment to produce and trial-produce TH550-NQ-Ⅱ weather-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;Con-tinuous 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 of φ 6.5 mm T550-NQ-Ⅱ wire 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 fin-ished product size meets the C-level accuracy and the surface quality is good.The product quality fully meets the us-er'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Key words
TH550-NQ-Ⅱ weather-resistant welding wire steel/product development/metallographic structure/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据