Abstract: Test     air-cooled     low     carbon     Bainitic     steel     DB590(0.06C,0.92Mn,0.49Mo,0.65Cr,0.02Nb,0.08V, 0.0010B)was  melted  by  a  50  kg  vacuum  induction  fumace,cast  to  22  kg  ingot,forged  to  100  mm×100  mm×150  mm billet then control-rolled to  16 mm plate,air-cooled. The CCT curves of the  steel have been got by Gleeble  1500 thermal simulation  machine.  The  microstructure  of  steel  DB590  air-cooled(3  ℃/s)after  rolling  was  bainite  +  ferrite  matrix,the mechanical properties  of plate  were  tensile  strength  645  MPa,yield  strength  471  MPa,elongation  32%,impact  energy  at  0 ℃ 94 J with excellent cold-bending property.

Key words: Air-cooled Low Carbon Bainitic Steel,Microstructure,Properties

摘要： 试验用空冷低碳贝氏体钢DB590(%:0.06C、0.92Mn、0.49Mo、0.65Cr、0.02Nb、0.08V、0.001 0B)由50 kg真空感应炉熔炼、铸成22 kg锭、锻成(mm)100×100×150钢坯,并控制轧成16 mm板,空冷。通过Gleeble 1500热模拟机得出该钢的CCT曲线。DB590钢轧后空冷(3℃/s)的组织为贝氏体+铁素体基体,钢板的抗拉强度645 MPa,屈服强度471 MPa,伸长率32%,0℃冲击功94 J以及优良的冷弯性能。

关键词: 空冷低碳贝氏体钢, 组织, 性能