Production method of hot-rolled strip steel for low-cost and low-yield-strength DC01 cold-rolled sheet

Abstract

Production method of hot-rolled strip steel for low-cost and low-yield-strength DC01 cold-rolled sheet The invention discloses a production method of hot-rolled strip steel for a low-cost and low-yield-strength DC01 cold-rolled sheet, and relates to the technical field of ferrous metallurgy. The production method specifically comprises the following procedures of being subjected to a 150t converter, a 210mm / 230mm slab continuous casting machine, hot-state slab heating, two roughing mills and seven 1780mm hot continuous rolling units, coiling and warehousing after steel coil cooling, and cold rolling. Under the condition that the product quality is guaranteed, the smelting process is simplified, and the smelting efficiency is improved; the mode of heating a plate blank in a heating furnace is improved, the heating time is shortened, the heating temperature is reduced, the gas consumption is reduced, and the production cost is reduced; and the rolling temperature after rolling is optimized, ferrite grains of hot-rolled raw materials are properly increased, the distribution state of cementite is improved, under the condition that the cold-rolling production process is not changed, the yield strength of the DC01 cold-rolled sheet is reduced, and the deep processing requirement of a user is met. The production method is clear, simple to operate, obvious in effect and wide in popularization and application.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for producing hot-rolled steel strips for low-cost low-yield strength DC01 cold-rolled plates. Background technique [0002] In GB / T 5213-2019 "Cold-rolled low-carbon steel plates and steel strips", DC01 is classified as general-purpose cold-rolled plates according to their uses. The product performance requirements are: yield strength ≤ 280MPa, tensile strength 270MPa~410MPa, elongation Rates are graded according to specification requirements. Although the standard has a wide range of requirements for yield strength, users often have problems with poor formability or cracking during processing due to the high yield strength during processing, and have repeatedly proposed to manufacturers to reduce the yield strength of DC01 cold-rolled sheets. Require. [0003] The DC01 cold-rolled plate produced by the process of "steelmaking→LF refining→slab contin...

AI Technical Summary

Problems solved by technology

[0005] The invention mainly relates to the field of continuous hot rolling production of hot rolling raw materials for the production of high-quality and efficient DC01 cold-rolled sheets, solves the problems of high production cost and high strength performance of commonly used cold-rolled sheets DC01, and invents a low-cost and low-yield Production method of hot-rolled steel strip of strength DC01 cold-rolled plate