Stable production method for hot rolling of thin-gauge ultrahigh-strength quenching-partitioning steel

Abstract

The invention discloses a stable production method for hot rolling of thin-gauge ultrahigh-strength quenching-partitioning steel. The stable production method comprises the following steps of rollinglength transition, heating, rough rolling, finish rolling and coiling. The stable production method for hot rolling of the thin-gauge ultrahigh-strength quenching-partitioning steel effectively improves the production stability of a hot rolling production line of the thin-gauge ultrahigh-strength quenching-partitioning steel; optimization is conducted on the multiple aspects of the rolling gauge,the steel charging sequence, the heating process system, the rough rolling and finish rolling technology, coiling tension and the like, and the stable production method is used for guiding on-site production operation, improving the shape quality of the rolled piece, and effectively improving the rolling stability; finish rolling adopts the concepts of conducting acceleration and water reduction,lowering temperature drop of the process, reducing vibration of a rolling machine, preventing strip steel from tail whipping and the like to conduct stable rolling control; the stable production method achieves stable mass production in the hot rolling procedure of the thin-gauge quenching-partitioning steel which is quite high in production difficulty and achieves the purposes of lowing cost andincreasing benefits.

Description

technical field [0001] The invention relates to the technical field of strip steel production, in particular to a stable production method for hot-rolled thin-gauge ultra-high-strength quenched ductile steel. Background technique [0002] The third-generation ultra-high-strength steel, that is, quenched ductile steel (QP steel), not only has high strength, but also has high elongation, and is suitable for the production of stamping parts with relatively complex shapes and high strength requirements, making full use of the plastic properties of ultra-high-strength steel plates , Work hardening properties, can better achieve weight reduction and optimization of vehicle performance. The application of ultra-high-strength steel on the car body can alleviate the problems of energy saving, emission reduction, low-carbon environmental protection, and is conducive to the sustainable development of the automobile industry. QP steel (quenched ductile steel) has become a hot spot in th...

AI Technical Summary

Problems solved by technology

In this application, the tensile strength of the cold-rolled quenched ductile steel prepared by slab preparation, heating, hot-rolling, cooling, coiling, cold-rolling and continuous annealing reaches 980-1200MPa, and the strong-plastic product reaches more than 25GPa·%. The invention mainly explains the production process of cold-rolled and quenched ductile steel, and gives the process control objectives of each process, but does not propose specific control measures for specific specifications. The production difficulty of thin-scale products is doubled compared with that of thick-scale products. This invention only Some basic processes of hot rolling are given, such as the production of thin-gauge products. To meet the target requirements, the hot rolling process is very difficult. The invention does not propose a solution for how to achieve stable production

Images