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 Φ36 ~40 mm HRB500 E rebar is designed as(%)0.22~0.25 C,0.60~0.70 Si,1.50~1.60 Mn,0.11~0.13 V,P≤0.045,S≤0.045 in shuigang.The productive process such as steelmaking in 100 t 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 Φ36 mm HRB500 E rebar are as follows :yield strength R_(eL)~0 540 ~580 MPa,tensile strength R_m~0 705 ~735 MPa,percentage elongation after fracture A 15.5% ~20.5%,total elongation at maximum force A_(gt)11.5%~14.0%,the ratio of actual measured tensile strength to actual measured yield strength R_m~0/R_(eL)~0 is 1.25 ~ 1. 32,the ration of actual measured yield to yield strength stipulated in GB/T 1499. 2-2018 R_(eL)~0/R_(eL)is 1.08 ~ 1.16,therefore,mechanical properties of the bebar meet requirements of GB/T 1499.2-2018 standard. The microstructure of Φ40 mm HRB500 E rebar produced is ferrite and pearite.its grain size is 9.5 ~10 grade.
引文
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