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钒氮微合金化是高强耐候钢YQ450NQR1强化屈服强度的重要途径。钒氮微合金化对高强耐候钢YQ450NQR1性能的影响主要由钒和氮两部分构成,其中钒产生晶粒细化、析出强化的主要作用,氮强化钒的作用。通过高强耐候钢YQ450NQR1的钒氮积w(V)·w(N)研究,发现钒和氮质量分数的增加均可提高钢的屈服强度,同时钒和氮也呈乘积的方式对屈服强度产生影响。为保证高强耐候钢YQ450NQR1的屈服强度达到465 MPa,要求钒氮积w(V)·w(N)达到0.001 44以上。为提高连铸坯的高温塑性,降低铸坯裂纹发生的敏感性,氮质量分数需控制为0.012%~0.014%。
Micro-alloying of vanadium and nitrogen is an important way to strengthen the yield strength of high-strength weathering steel YQ450NQR1. The effect of vanadium-nitrogen micro-alloying on the properties of high-strength weathering steel YQ450NQR1 is mainly composed of two parts, vanadium and nitrogen. Vanadium produces the main role of grain refinement and precipitation strengthening, and the effect of nitrogen strengthening vanadium. Through the study of the vanadium nitrogen product w (V) · w (N) of the high-strength weathering steel YQ450NQR1, it was found that the increase of the mass fraction of vanadium and nitrogen can increase the yield strength of steel and the yield strength of vanadium and nitrogen also multiplied . In order to ensure that the yield strength of high-strength weathering steel YQ450NQR1 reaches 465 MPa, the vanadium-nitrogen product w (V) · w (N) needs to reach over 0.001 44. In order to improve the high temperature plasticity of slab and reduce the susceptibility of slab cracks, the nitrogen content should be controlled from 0.012% to 0.014%.