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酸洗板SPHC在用户冲压时出现制耳缺陷的质量问题,严重影响用户的成材率。通过对产生制耳缺陷的影响因素进行研究分析,以及对实例样品进行金相检测、化学元素成分检测、力学性能检测以及厚度测量分析,确认SPHC酸洗板尤其是带钢边部存在混晶组织、厚度设计控制以及用户模具使用等问题是引起制耳的主要原因。实践生产也表明:制定合理的热轧工艺制度、优化成分设计、采取厚度负公差轧制设计,以及用户采用合理的模具参数均可有效降低制耳缺陷的发生率。

Causes and Improvement of Stamping Earing of SPHC Hot Rolling Pickling Sheet

Earing defect appeared when an SPHC pickling sheet was pressed, which influenced product yield. Through research and analysis of factors causing earing defect，and metallographic examination, chemical composition analysis, mechanical property test, thickness measurement， it was indicated that the main reasons causing earing defect are mischcrystal structure especially at strip edge, thickness design and control and the use of mould. Production practice showed that effective actions as making reasonable hot rolling process system ,promoting composition design ,taking thickness negative tolerance design and using reasonable parameter of the mould should be performed to reduce the rate of earing defect.