Smelting Practice on Enhancing the Inclusion Percentage of Pass of CrMn Series Spring Bar
The inclusion type B or DS of partial heat of CrMn series steel in the production didn't meet the requirements,the inspection percentage of pass was only 98.5%-98.7%.The reasons of the inclusion type B or DS exceeding the requirements of customer was found and the specific improvement measures were put forward after the inclusion was analysed by using the Aspex technique,extremum method for the specimen sampling from BOF→LF→RH→CC→billet→finished product.The production showed the inspection percentage of pass was enhanced to 99.8%above from the past 98.5%-98.7%after adopting the improvement measures.
CrMn series steelinclusionAspex techniqueextremum methodinspection percentage of pass
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