通过加入微合金元素并与控轧控冷工艺相结合,开发出590 MPa建筑用低屈强比耐火钢。结果表明,该钢种屈服强度大于460 MPa,抗拉强度大于590 MPa,屈强比小于0.8,600℃的屈服强度大于室温的2/3,能满足590 MPa级建筑用低屈强比耐火钢的力学性能要求。 By adding microalloying elements and combined with the controlled rolling and controlled cooling process, a 590 MPa low yield ratio refractory steel for construction was developed. The results show that the yield strength of the steel is more than 460 MPa, the tensile strength is more than 590 MPa and the yield ratio is less than 0.8. The yield strength at 600 ℃ is more than 2/3 of the room temperature, which can meet the requirements of 590 MPa low- The mechanical performance requirements.