Optimization of continuous casting soft reduction process for S650MC high strength steel

Abstract

Abstract: For resolved the problem of the S650MC steel hot rolled coil has a certain percentage of lamination,one of the main reasons of the tensile lamination is the slab center segregation,the process optimization experiment was carried out.The result showed that:the amount of reduction was increased from 3.6mm to 4.4mm in the fs =20%－75% reduction zone，the total amount of reduction was increased from 4.5 mm to 5.5mm，this optimal process project could significantly improve the quality of center segregation.The average center segregation etching grade of S650MC steel was improved from B1.0 to C1.0.The rate of the tensile lamination was decreased from 4.20 % to0.78 %.Meanwhile,showed that the effect of improving S650MC steel center segregation quality by S-EMS was not obvious,but the equiaxed grain ratio of slab can increase about 2 %－3 %.

Key words: S650MCsteel, tensile lamination, soft reduction, center segregation

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Optimization of continuous casting soft reduction process for S650MC high strength steel

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