The paper analyses and discusses the stamping cracking problem of SPHC product raised by the down-stream customer.The results show that the inclusions detected from the fracture of the failed specimen are the direct cause of the cracking.The inclusions contain elements such as K and Na specific in mould powder,which proves that the inclusions originate from the mould powder.The mould liquid level fluctuation exists during casting.After taking corrective measures and 6 months time verification,the re-judging rate due to inclusion is effectively reduced with im-proved product quality.
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