Defect Analysis and Improvement of Continuous Casting Slab for Limit Thickness Steel Plate
LI Hongwen
Abstract：Pointing at UT failure problem of ultra-thick steel plate rolling by continuous casting slab, the slab and the plate were sampled for macro-etch testing and the plate simples were made metallographic analysis. The results showed that the continuous casting billet itself had more severe central porosity and center segregation; The porosity was remained in the plate after rolling;Micro-crack was found around the position where severe segregation exists. Measurements were applied such as improvement of steel cleanness, application of S-EMS, optimization of soft reduction process, and increase of reduction amount of rolling pass, that guarantee the quality of ultra-thick plate. The UT pass rate reached 98.97% after improvement.
Keywords：continuous casting slabultra-thick plateporositysegregation
Publication Date：2014-11-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 41-43 )