Cause Analysis on Poor Uniformity of the Properties in Same Plate of High-strength Steel Plate and Improvement Measures
WANG Yong
Abstract：Pointing to poor uniformity problem in the microstructure and properties for same TMCP high strength plate, taking Q550D plate as an example, analysis considered that the main cause for poor cooling uniformity of plate is caused by oxide scale, wave plate shape and setting of Mulpic system, etc. Through transforming the high pressure water descaling system, optimizing draught distribution system, transforming Mulip cooling process parameters and reforming water cooling equipment, etc, the surface fineness and flatness of plate were improved , and the cooling uniformity of steel plate was risen. After improvement, the yield strength difference of head, medium and tail in same plate was decreased from 55-139 MPa to 20-41 MPa and tensile strength difference was decreased from 53-186 MPa to 18-26 MPa.
Keywords：high-strength steel plateproperty in same plateuniformitywater-coolingflatnessfineness
Publication Date：2013-09-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 4-5,8 )