Method for producing cold-rolling low-carbon aluminum killed steel with uniform through plate mechanical property

Abstract

The invention discloses a method for producing cold-rolling low-carbon aluminum killed steel with a uniform through plate mechanical property, which belongs to the technical field of steel rolling. The method comprises the following process flows of: performing krypton (KR) desulfuration treatment, performing steelmaking by using the conventional converter, performing composition adjustment system (CAS) / relative humidity (RH) refining treatment, continuously casting, and performing hot loading and hot feeding; performing rough rolling, performing precision rolling, performing laminar cooling, and reeling; unreeling, performing acid washing, performing continuous cold rolling, and reeling; and unreeling, washing, continuously annealing, smoothing, and reeling. The method is characterized in that: the cold-rolling low-carbon aluminum killed steel which has the width of 750 to 1,580 mm, the thickness of 0.25 to 2.5 mm and the uniform through plate property is produced by a 2,250 mm or 1,580 mm continuous hot rolling machine set, a 1,700 mm acid rolling machine set and a 1,700 mm continuous annealing machine set. A trace amount of B is added into the low-carbon aluminum killed steel to appropriately improve finish rolling temperatures and appropriately reduce rolling process parameters such as reeling temperatures, annealing temperatures and the like, so that thick boron nitride (BN) is fully separated out; and thin dispersed aluminum nitride (AlN) is effectively prevented from being separated out, so that the uniformity of the through plate mechanical property of the cold-rolling low-carbon aluminum killed steel is improved.

Description

technical field

[0001] The invention belongs to the technical field of steel rolling, and in particular provides a production method of low-carbon aluminum-killed steel with uniform mechanical properties through the plate, which is a low-cost, high-efficiency production technology for improving the uniform mechanical properties of cold-rolled strip steel. technical background

[0002] Cold-rolled steel strip is mainly used in industries such as automobiles and home appliances. In recent years, the output of home appliances and automobiles in my country has increased by leaps and bounds, greatly expanding the market capacity of cold-rolled sheets. Therefore, many iron and steel enterprises position cold-rolled sheets as high-quality, high-value-added products Fist product. However, with the rapid development of industries such as automobiles and home appliances, the requirements for cold-rolled sheets are getting higher and higher, sometimes even harsh, and the uniformity of m...