冷轧退火板DP钢成材率低原因分析

摘要：以冷轧退火板DP980为研究对象，结合生产过程中的工艺过程参数，利用金相显微镜、电子显微镜、显微硬度计、室温拉伸试验机对热轧卷、冷硬卷、退火卷试样的显微组织、硬度、强度、伸长率等进行了分析。结果表明，热轧卷生产过程中，为了控制带尾抛钢稳定性而降低卷取速度，导致带尾卷取温度较低，力学性能不均，遗传到冷轧工序转变为厚度波动。目前，冷轧各工序通过切头尾的方法，对于此问题进行控制，也就导致了DP钢成材率较低。

Analysis of low yield of cold rolled annealed DP steel

Taking cold-rolled annealed sheet DP980 as the research object and combining with the process parameters in the production process, the microstructure, hardness, strength and elongation of hot rolled coil, cold rolled coil and annealed coil samples were analyzed by means of optical microscope, scanning electron microscope, microhardness tester and room temperature tensile testing machine. The results show that the coiling speed is reduced to control the stability of strip coiling during the hot rolling process, which results in lower strip coiling temperature and uneven mechanical properties, and thus produces thickness fluctuation in cold rolling process. At present, to solve this problem, cutting the head and tail ends was carried out in each procedure of cold rolling, which also led to the low yield of DP steel.