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-fast cooling mechanism of rolled stock was investigated. The experiment was carried out on Hbeam by using ultra-fast cooling device of Northeastern University. The effects of different cooling rates and cooling methods on structure and properties of Q235B and Q345B rolled stocks after rolling were analyzed. The results show that the strength is improved by 205 MPa at 444.4 ℃/s of cooling rate by using single-stage cooling. The strength is improved by 230MPa by using two-stage cooling, when the cooling rate reaches to 385 and 297 ℃/s. Two types of cooling methods can both dramatically improve the strength of rolled stocks. Where as the cooling effect of two-stage cooling is apparently higher than single-stage cooling. It will provide technical supports for realizing low cost industrial production of H-beam and production of higher level steel.
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