高碳钢50-2冲压鞋包头开裂原因分析与控制

Analysis and control of high carbon steel 50-2 stamping toe cap cracking

高碳钢50-2热轧板经罩式退火炉退火后,在冲压鞋包头过程中出现了严重开裂的现象。利用光电直读光谱仪、NeophotⅢ型光学显微镜、TCH600氧氮分析仪、洛氏硬度测量法(HR)中的B级标尺对缺陷样品化学成分、组织性能进行了深入的研究。结果表明,冷轧退火板氮含量高、退火均热保温时间短是产生冲压鞋包头开裂的主要原因。通过优化炼钢生产工艺、退火工艺,使冲压开裂缺陷率大幅下降,产品质量最终满足生产要求。

The high carbon steel 50-2 was cracked seriously during the stamping process after annealing in a bell-type annealing furnace. Using photoelectric direct reading spectrometer, Neophot Ⅲ type optical microscope, TCH600 nitrogen oxygen analyzer, rockwell hardness measurement method(HR) of class B scale on the defect sample chemical composition, organization performance carried on the thorough research. The results show that high nitrogen content and short soaking time of anneal are the main causes of stamping toe cap cracking. By optimizing steelmaking process and annealing process, the cracking defect rate of stamping has been greatly reduced, and the product quality has finally met the production requirements.