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研究了控轧控冷对锚链用钢25MnV盘条组织和力学性能的影响。结果表明:降低终轧温度和提高冷却速率有助于25MnV钢的屈服强度、抗拉强度和屈强比的提高。冷却速率为2.5℃/s时,随着终轧温度降低,试验钢强度上升,其主要原因是细晶强化和析出强化的共同作用;强韧性上升的原因为晶粒细化和V(C,N)相间析出粒子变细。终轧温度为820℃时,随着冷却速率提高,试验钢强度上升和强韧性下降,其主要原因是显微组织中出现异常组织马氏体岛。
The effect of controlled rolling and controlled cooling on the microstructure and mechanical properties of 25MnV steel wire rod for anchor chain was studied. The results show that reducing the finish rolling temperature and increasing the cooling rate contribute to the increase of yield strength, tensile strength and yield ratio of 25MnV steel. When the cooling rate is 2.5 ℃ / s, the strength of the test steel increases with the decrease of the finish rolling temperature, which is mainly due to the combination of fine grain strengthening and precipitation strengthening. The reason for the increase of toughness is the grain refinement and V (C, N) phase precipitated particles become thinner. When the finish rolling temperature is 820 ℃, the strength and toughness of the test steel increase with the increase of the cooling rate. The main reason is the presence of abnormal martensite islands in the microstructure.