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对高强度低屈强比建筑用钢进行了实验室生产研究。通过适当的成分设计,利用两阶段的控制轧制及超快冷技术对试验钢的组织进行控制以达到提高强度、降低屈强比的目的。结果表明:终轧后立即冷却到690℃左右后空冷至室温,可以得到具有贝氏体铁素体软相基体、体积分数为9.2%的M/A组元作硬质第二相的复相组织,其屈服强度与抗拉强度均满足780 MPa级相关要求,同时屈强比在0.7左右。
Laboratory research on high strength and low yield ratio steel for construction was conducted. Through the appropriate composition design, the use of two-stage control rolling and ultra-fast cooling technology to control the organization of the test steel in order to achieve the purpose of increasing strength and yield ratio. The results show that the M / A component with bainitic ferrite soft phase matrix and the volume fraction of 9.2% M / A can be obtained as the second phase of hard second phase after cooling to about 690 ℃ and cooling to room temperature immediately after finishing rolling. Organization, the yield strength and tensile strength meet the requirements of 780 MPa class, while the yield ratio at about 0.7.