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700MPa以上级高强汽车大梁钢的冲压开裂现象一直是困扰该类钢种使用的主要问题。控制夹杂物、中心偏析及剪切面修磨等手段可以降低冲压开裂的概率。侧重从热轧工艺角度寻找导致带钢冲压开裂的原因及机制。通过分析对比正常带钢及冲压开裂带钢的组织、力学性能、加热及粗轧温度制度、精轧卷取温度制度、轧制速度的不同,同时考虑热装制度的影响,详细分析了热轧工艺各参数在750MPa级高强大梁钢冲压开裂缺陷中可能起到的作用,为该类钢种的生产提供了有益的经验。结果表明,保证精轧区轧制速度是降低冲压开裂发生率的重要热轧生产手段。
700MPa and above high-strength automobile girder stamping and cracking phenomenon has been troubled by the use of such steel main problem. Control of inclusions, center segregation and shear surface grinding and other means can reduce the probability of stamping cracking. Focus on the hot-rolled process from the point of view to find the cause and mechanism of the strip stamping cracking. By analyzing the microstructure and mechanical properties of normal strip and stamping and cracking strip, different heating and roughing temperature, coiling temperature and rolling speed, taking into account the influence of hot charging system, The parameters of the process may play a role in the stamping and cracking defects of 750MPa high-strength girder steel, which provides beneficial experience for the production of such steel. The results show that to ensure the finishing rolling speed is to reduce the incidence of stamping cracking an important means of hot-rolled production.