药芯焊丝用冷轧钢带的开发与生产

Development and production of cold rolled steel strip for flux-cored wire

根据药芯焊丝用冷轧钢带的技术要求,对关键生产工艺进行了研究.炼钢时采用双渣法脱磷、"LF+RH"精炼工艺,可保证冶炼成分达到低C、低Si、低P的要求;热连轧时采用"三高一低"的温度制度,即高温加热、高温初轧、高温终轧和低温卷取;冷轧时采用恒延伸率平整模式,成功开发出药芯焊丝用冷轧钢带.产品的通卷性能稳定,屈服强度、抗拉强度的波动范围都稳定在±30 MPa,延伸率为39%～45%,达到了药芯焊丝生产所要求的高拉延性能.

Based on the requirements of cold roiled steel strip for flux-cored wire, the major processes and technology were investigated. Using double slag dephosphorization, ＂LF＋RH＂ process of refining in steel making can meet material requirements of low C, low Si and low P. A temperature system of ＂three high and a low＂in hot strip rolling,that is high heating, high blooming mill,high finishing and low coiling was used and a constant elongation flat in cold rolling was used to meet the requirements of volume stability, thus good formihg performance and the properties of yield strength and tensile strength fluctuated within ±30 MPa,the elongation was controlled within 39%-45%. All these can meet the requirements of high drawing of cold rolled steel strip for flux-cored wire.