700 MPa级高强热轧双相钢DP700的开发

Research and Development of 700 MPa Grade High Strength Hot Rolled Dual Phase Steel DP700

阐述了在宝钢梅山基地1780热轧机生产线上开发的700MPa级热轧双相钢DP700(/%:C 0.08~0.12,Si 0.08~0.12,Mn 1.30~1.150,P≤0.015,S≤0.005,Cr0.50~0.70,Ca≥0.0015,Al≥0.015)工艺和性能,该钢板表面质量优良,屈服强度≥400 MPa,抗拉强度≥700 MPa,断后伸长率≥17%(b=20 mm,L_0=80 mm),扩孔率≥35%,50%存活率的疲劳极限达475 MPa。结果表明,DP700钢是一种具有良好应用前景的新型汽车零部件材料。

The process and properties of 700 MPa grade hot rolled dual phase steel DP700(/%:C 0.08~0.12,Si0.08~0.12,Mn 1.30~1.150,P≤0.015,S≤0.005,Cr 0.50~0.70,Ca≥0.0015,Al≥0.015)development at Baosteel Meishan 1780 hot rolling mill are summarized.The developed plate has superior surface quality,its properties are Yield strength≥400 MPa,Tensile strength≥700 MPa,Elongation after fracture≥17%(b=20 mm,L0=80 mm),Hole expansion rate≥35%,50%survival rate fatigue limit 475 MPa.Results show that the steel DP700 is one of new material for Auto industry with good application prospect.