可焊接高强钢筋500B的开发生产实践

Development and Production of Weldable High Strength Steel Bar 500B

宣钢采用铁水扒渣—转炉—LF精炼炉—12机12流连铸机(165方电磁搅拌)—棒材轧制的生产工艺,制定炼钢、精炼、连铸、轧制工艺控制要点,开发生产了可焊接高强钢筋500B。产品整体性能较好,生产稳定,焊接后屈服强度(549MPa)下降2 MPa,抗拉强度(697 MPa)升高1 MPa,拉伸断口为延性,断裂过程发生在母材,产品具有较好的焊接性能。

The production technology of weldable high strength steel bar 500B is slag-converter-LF refining furnace-12 machine 12 stream continuous casting machine （165 square electromagnetic stirring） - bar rolling in Xuan steel. The detailed key points of process control in the steelmaking, refining, continuous casting, rolling process were made. The actual production situation showed that the overall performance is better and stable. After welding, the product has good weldability. Such as the yield strength （549 MPa） is decreased by 2 MPa, the tensile strength （697 MPa） is increased by 1 MPa, the tensile fracture is ductile, and the fracture process occurs in the base metal.