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采用V-N微合金化工艺,开发出了屈服强度490 MPa以上的高强门架型钢。针对生产过程中出现的冲击性能不合,采用V-Ti微合金化工艺后,冲击性能明显提升,最高达到102 J,原因是Ti的细化晶粒作用,但屈服强度有所降低,是因为Ti N的生成减弱了V-N的强化作用。生产过程中在型钢翼缘尖部出现裂纹,在生产工艺基本不变的条件下,分析产生的原因是钢中N元素含量高,N与V和Ti等元素形成氮化物在晶界析出促进了方坯横裂纹的发生,采用V-Fe合金代替部分V-N合金后,有效消除了翼缘裂纹的产生。
V-N micro-alloying process has been used to develop high-strength gantry steels with yield strength of 490 MPa or more. Impact on the performance of the production process does not fit the use of V-Ti microalloying process, the impact performance improved significantly up to 102 J, because the grain refinement of Ti role, but the yield strength decreased, because the Ti The formation of N weakens the potentiation of VN. In the process of production, cracks appear on the tips of steel flanges. Under the condition of basically unchanged production process, the reason for the analysis is that the content of N in steel is high, and the formation of nitrides such as N and V and Ti precipitates at grain boundaries The occurrence of billet transverse cracks, the use of V-Fe alloy instead of part of the VN alloy, the effective elimination of the flange crack.