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阐述了轧材超快速冷却机制,利用东北大学试验装置对H型钢进行了超快速冷却试验研究,重点分析了莱钢Q235B,Q345B钢种轧后不同冷却速度、不同冷却方式对轧材组织和性能影响规律。试验表明:使用单段式冷却,冷速达到444.4℃/s时,屈服强度可提高205MPa;使用两段式冷却,一次冷却和二次冷却的冷速分别为385和297℃/s时,屈服强度可提高230MPa。2种冷却方式均能大幅度提高轧材强度,两段式冷却效果明显高于单段式冷却,为实现低成本生产H型钢及生产更高级别高强钢提供了技术支持。
The ultra-rapid cooling mechanism of the rolled material was described. The ultra-rapid cooling test of the H-shaped steel was carried out by Northeastern University Test Equipment. The effects of different cooling rates and cooling methods on the microstructure and properties Affect the law. The results show that the yield strength can be increased by 205MPa when the cooling rate reaches 444.4 ℃ / s using single-stage cooling. When two-stage cooling is used, the cooling rates of primary cooling and secondary cooling are 385 and 297 ℃ / s, respectively. Strength can be increased 230MPa. The two kinds of cooling methods can greatly improve the strength of rolled products. The cooling effect of two-stage cooling is obviously higher than that of single-stage cooling, which provides technical support for low-cost production of H-section steel and production of higher-grade high-strength steel.