热轧带肋钢筋控轧工艺生产实践

Practice of Controlled Rolling Process for Ribbed Bar

为了在中、精轧之间没有足够的轧件均热距离的生产线上也能实现钢筋的控轧控冷,并降低HRB400钢筋中的微合金元素含量,莱芜钢铁股份有限公司棒材厂在其中小型车间进行了生产试验,通过将开轧温度由1030～1060℃降低到1000～1030℃,在中、精轧之间增设长6m的轻穿水装置,在微合金元素V含量减半的情况下,Φ28、Φ32mm钢筋的平均屈服强度达459.85MPa,平均抗拉强度达605.83 MPa,平均伸长率达20.87%。

To realize controlled rolling and controlled cooling in production line without enough distance be- tween medium mill and finishing mill for soaking of piece, and reduce micro-alloy contents, the test was carried out in medium and small section steel production line of Laiwu Iron and Steel Co. , Ltd. Based on it, the average yield strength reached 459.85MPa, the average tensile strength reached 605.83 MPa, the average elongation reached 20.87% of a928mm and 6932mm ribbed bar by decreasing start rolling temperature from 1030- 1060℃ to 1000--1030℃ ,adding 6m length cooling equipment in finishing mills and decreasing vanadium content to half of original.