SWRH82B热轧线材生产实践

Production practice of SWRH82B hot rolling wire rod

介绍（O）12.5 mm SWRH82B热轧线材的质量要求,其化学成分w（C）为0.79％～0.83％,w（Si）为0.15％～0.35％,w（Mn）为0.60％～ 0.90％,w（P）≤0.020％,w（S）≤0.015％;线材金相组织应控制为索氏体;内控标准要求抗拉强度Rm≥1140 MPa,断面收缩率Z≥30％,不圆度≤0.30 mm.通过控轧控冷实践,得出合理的热轧工艺：开轧温度1020～1060℃,进精轧温度880～920℃;终轧温度930～ 970℃,吐丝温度820～860℃.

To introduce the quality requirement of diameter 12.5 mm SWRH82B hot rolling wire rod,its chemical component w（C） is 0.79％ ～0.83％,w（Si） is 0.15％ ～0.35％,w（Mn）is 0.60％ ～0.90％,w（P） ≤0.020％,w（S） ≤0.015％;microstructure of the wire rod should be sorbite;internal control standard require tensile strength Rm ≥1140MPa,reduction of cross section Z ≥ 30％,non-circularity ≤ 0.30 mm.Through the controlled rolling and cooling practice,get the reasonable hot rolling process：start rolling temperature is 1020 ～ 1060 ℃,the temperature when entering the finishing mill is 880 ～ 920 ℃;the finishing rolling temperature is 930 ～ 970 ℃,the laying temperature is 820 ～ 860 ℃.