Low boron alloyed steel by hot rolling

Abstract

The invention was about one kind of low Boracium alloyed steel that use for hot rolling (low yield strength <=280 Mpa / cmm2). It has a special use for cold roll steel material and hot roll punching steel material. The hot roll steel that has a low B has the mass ratio of ingredient: C<=0.01%, Si 0.01-0.10%, Mn 0.10-1.0%, S 0.001-0.020%, P<=0.020%, B 0.0003-0.015%, Al 0.03-0.06%, N 0.003-0.009%, the residue is impurity Fe. Its advantages include good ingredient in design; lower cost; good property for cold roll; good punching.

Description

[0001] Field [0002] The invention belongs to low boron alloy steel for hot rolling (low yield strength≤280Mpa / cmm 2 ) field of preparation. It is especially suitable for preparing cold-rolled steel sheets with good properties and hot-rolled mild steel materials for hot-rolled stamping parts. Background technique [0003] With the rapid development of all walks of life in my country (such as: automobiles, machinery, construction, light industry, etc.), in addition to the construction of hot rolling production lines in recent years, my country has successively introduced a number of thin slab continuous casting and rolling production lines. At present, some enterprises with this production capacity have combined the TSCR line or conventional hot rolling line and cold rolling line into a complete large-scale industrial production process. However, due to the characteristics of the TSCR production line, there are still hot spots in industrial production practice. The yield str...

AI Technical Summary

Problems solved by technology

But when adopting above-mentioned preparation method also can bring correspondingly following many negative influences, its performance has: (1) owing to needing to improve the rolling temperature of slab, so the phenomenon that the coil surface easily produces serious oxidation, in high temperature hot rolling The thickening of the oxide scale will lead to the deterioration of the surface quality of the slab

(2) During the processing of high-temperature hot rolling, there is a phenomenon of collapse from time to time.

(3) When the heating temperature, rolling speed and reduction rate of the slab are increased, the service life of the coiler will be significantly reduced

(4) Defects of horizontal folds on the surface of the sheet are prone to occur when uncoiling

So far, due to these negative effects caused by the above factors, effective solutions and good control methods have not been found so far.