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
[ "王琳松(1959-),男,硕士(2009年武汉科技大学),工程技术应用研究员,1982年江西冶金学院(本科)毕业,钢铁冶金工艺研究。" ]
收稿:2018-07-19,
网络首发:2022-05-24,
纸质出版:2019-05-24
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王琳松, 张新建, 常进, 等. 热轧Φ6 ~40 mm HRB500E螺纹钢筋的生产实践[J]. 特殊钢, 2019,40(1):34-38.
王琳松, 张新建, 常进, et al. Productive Practice of Hot-Rolled Φ6 ~ 40 mm HRB500E Reinforcing Steel[J]. Special Steel, 2019, 40(1): 34-38.
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Re
L
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 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≤ 0.045 in shuigang. The productive process such as steelmaking in l00t 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 Φ 36 mm HRB500E 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
0
is 1.08 〜1.16
therefore
mechanical properties of the rebar meet requirements of GB/T 1499.2-2018 standard. The microstructure of Φ40 mm HRB500E rebar produced is ferrite and pearite
its grain size is 9.5 ~ 10 grade.
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