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对高性能桥梁钢的成分进行了设计,并通过不同的控轧控冷工艺轧制成不同板厚的钢板。钢板经过回火后,进行了力学性能的测试及组织分析。结果表明,高性能桥梁钢回火后的强度较高,屈服强度达到600 MPa以上,伸长率达到20%以上。由于轧制工艺的不同,不同板厚的钢板冲击性能有较大的差距;显微组织主要由粒状贝氏体和板条贝氏体组成。测定了高性能桥梁钢的连续冷却转变曲线,结果表明:实际生产中,应将冷速控制在10～30℃/s,开始冷却温度约780℃,此时的相变组织为较均匀的贝氏体组织。
The composition of high-performance bridge steel was designed and rolled into different thickness steel plates through different controlled rolling and controlled cooling processes. After tempering the steel, the mechanical properties of the test and organizational analysis. The results show that high strength steel after tempering the higher strength, yield strength of 600 MPa or more, the elongation rate of 20% or more. Due to the different rolling process, different plate thickness of the impact properties of steel have a larger gap; microstructure mainly composed of granular bainite and lath bainite. The continuous cooling transformation curves of high performance bridge steel were measured. The results show that in practical production, the cooling rate should be controlled at 10-30 ℃ / s and the cooling temperature should be about 780 ℃. The phase transformation microstructure is more uniform Tissue.