热轧Φ36～40 mm HRB500E螺纹钢筋的生产实践  

Productive Practice of Hot-Rolled Φ36～40 mm HRB500E Reinforcing Steel

作　　者：王琳松[1] 张新建[1] 常进[1] 龙雨[1] 陈黔湘 高长益 Wang Linsong;Zhang Xinjian;Chang Jin;Long Yu;Chen Qianxiang;Gao Changyi(Shuicheng Iron and Steel Group Corp,Liupanshui 553028;Manufaeture Management Department, Shuicheng Iron and Steel Group Corp ,Liupanshui 553028)

机构地区：[1]水城钢铁集团公司,六盘水553028 [2]水城钢铁集团公司制造管理部,六盘水553028

出　　处：《特殊钢》2019年第1期34-38,共5页Special Steel

摘　　要：根据GB/T 1499.2-2018标准,水钢设计了Φ36～40 mm HRB500E螺纹钢筋的内控成分为(%)0.22～0.25C、0.60～0.70Si、1. 50～1.60Mn、0.11～0.13V、P≤0. 045、S≤0. 045。采用"100 t顶底复吹转炉冶炼-挡渣出钢-脱氧合金化-LF炉精炼-160方坯连铸-方坯加热-棒材轧制-空冷"的工艺流程,生产出的Φ36 mm HRB500E螺纹钢筋的屈服强度R_(eL)~0 540～580 MPa,抗拉强度R_m^0 705～735 MPa,断后伸长率A 15. 5%～20. 5%,最大力总延伸率A_(gt)11.5%～14.0%,实测抗拉强度与实测屈服强度之比R_m^0/R_(eL)~0为1.25～1.32,实测屈服强度与GB/T 1499.2-2018标准要求的最低屈服强度之比R_(eL)~0/R_(eL)为1.08～1.16,因此,钢筋的力学性能满足GB/T 1499.2-2018标准要求。生产出的Φ40 mm HRB500E钢筋的微观组织为铁素体+珠光体,晶粒度为9.5～10级。According to GB/T 1499.2-2018 standard,the internal controlled composition of Ф36-40mm HRB500E rebar is designed as (%)0.22-0.25C,0.60-0.70Si,1.50-1.60Mn,0.11-0.13V,P ≤0.045,S ≤0.045in shuigang. The productive process such as steelmaking in 100t top and bottom combined blown converter-tapping with slag stopping-deoxidization and alloying-LF refining-continuous casting of 160 billet-reheating of billet -rolling of rebar-air cooling is used.The mechanical properties of Ф36mm HRB500E rebar are as follows:yield strength ReL^0540-580MPa,tensile strength Rm^0705-735MPa,percentage elongation after fracture A 15.5%-20.5%,total elongation at maximum force Agt11.5%-14.0%,the Rm^0/ReL^0 as 1.25-1.32,the ration of actual measratio of actual measured tensile strength to actual measured yield strength Rm^0/ReL^0 is 1.25-1.32,the ration of actual meas ured yield to yield strength stipulated in GB/T 1499.2-2018ReL^0/ReL is 1.08-1.16,therefore,mechanical properties of the bebar meet requirements of GB/T 1499.2-2018 standard.The microstructure of Ф40mm HRB500E rebar produced is ferrite and pearite,its grain size is 9.5-10 grade.

关 键 词：HRB500E 高强度钢筋 大规格 钒微合金化 

分 类 号：TG335.64[金属学及工艺—金属压力加工]