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对Q690qENH桥梁钢进行了减量化合金成分设计,降低了Ni、Cu元素的质量分数,克服了对Mo元素的依赖;基于新一代TMCP技术进行短流程工艺设计,生产出屈服强度为745MPa、抗拉强度为961MPa、伸长率为16.8%、-40℃夏比冲击功约为166J的低成本减量化Q690qENH桥梁钢。与传统桥梁钢TMCP+淬火+回火工艺相比,新一代TMCP工艺取消了淬火+回火过程,生产的Q690qENH桥梁钢吨钢可节约合金成本约1 521.08元,节水约2 180m3/h,节约用电275.37kW·h;相当于吨钢节约原煤消耗154.20kg,减少污染物排放量约361.83kg。对于新一代桥梁钢的生产,在降低物耗能耗、保护环境方面有重要的理论指导意义。
The Q690qENH bridge steel is designed with reduced alloying components, which reduces the mass fraction of Ni and Cu elements and overcomes the dependence on Mo. Based on the new-generation TMCP technology, short-run process design is performed to produce a yield strength of 745 MPa, Tensile strength of 961MPa, elongation of 16.8%, -40 ℃ Charpy impact energy of about 166J low-cost reduction Q690qENH bridge steel. Compared with the traditional bridge steel TMCP + quenching + tempering process, a new generation of TMCP technology canceled quenching + tempering process, the production of Q690qENH steel bridge steel can save alloy costs about 1 521.08 yuan, saving about 2 180m3 / h, saving Electricity 275.37kW · h; the equivalent of tons of steel to save coal consumption 154.20kg, reduce emissions of pollutants about 361.83kg. For the new generation of bridge steel production, there is an important theoretical guiding significance in reducing the consumption of material and energy and protecting the environment.