热轧Φ36～40 mm HRB500E螺纹钢筋的生产实践
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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.
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
[1]范银平,李璟,杨陈莉.HRB500E抗震钢筋生产工艺及性能优化[J].河南冶金,2017,25(1):32-34.
[2]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 1499.2-2018,钢筋混凝土用钢第2部分:热轧带肋钢筋[S].北京:中国标准出版社,2018.
[3]郭湛,于同仁,陈开智,等.高效节约型HRB500E高强抗震钢筋的研制[J].轧钢,2013,30(增刊1):1-4.
[4]郑雅文,白天平.宣钢大规格高强度螺纹钢的开发与生产[J].河北冶金,2015,(8):21-23.
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[7]陈伟,赵宇,张卫强,等.采用富氮钒微合金化生产大规格HRB500钢筋[J].钢铁研究,2011,39(1):23-27.
[8]马文,朱宝晶,陈文达,等. HRB400E、HRB500E大规格抗震钢筋的研发[J].莱钢科技,2011(4):55-58.
[9]王绍荣.Φ50mm大规格HRB500E抗震钢筋的试制[J].轧钢,2011,28(2):67-70.
[2]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 1499.2-2018,钢筋混凝土用钢第2部分:热轧带肋钢筋[S].北京:中国标准出版社,2018.
[3]郭湛,于同仁,陈开智,等.高效节约型HRB500E高强抗震钢筋的研制[J].轧钢,2013,30(增刊1):1-4.
[4]郑雅文,白天平.宣钢大规格高强度螺纹钢的开发与生产[J].河北冶金,2015,(8):21-23.
[5]孔维斌,黄贞益.BS G460大规格微合金化钢筋的开发[J].安徽工业大学学报,2001,18(4):319-322.
[6]王洪锋,王耀山.钒氮微合金技术在HRB500E开发中的应用[J].甘肃冶金,2014,36(2):32-35.
[7]陈伟,赵宇,张卫强,等.采用富氮钒微合金化生产大规格HRB500钢筋[J].钢铁研究,2011,39(1):23-27.
[8]马文,朱宝晶,陈文达,等. HRB400E、HRB500E大规格抗震钢筋的研发[J].莱钢科技,2011(4):55-58.
[9]王绍荣.Φ50mm大规格HRB500E抗震钢筋的试制[J].轧钢,2011,28(2):67-70.