A method for eliminating warping defects of boron-containing low carbon aluminum killed steel strip

Abstract

The invention discloses a method for eliminating warping defects of boron-containing low-carbon aluminum-killed steel strips. After the boron-containing low-carbon aluminum-killed steel is refined, if B is less than or equal to 0.0015%, cast molten steel to obtain slabs and then enter the The first heating process; if the boron-containing low-carbon aluminum killed steel is finished after refining, if 0.0015%<B≤0.0030%, cast molten steel to obtain slabs and enter the second heating process, the second heating process plate The temperature of the billet entering the furnace is controlled to be 300-600 °C, the furnace time is 130-180 minutes, and the temperature of the billet is controlled to be 1170-1220 °C. Based on the existing equipment for steel making and hot rolling, the invention eliminates the edge warping defect of the hot-rolled steel strip of boron-containing low-carbon aluminum killed steel through the control of composition and hot rolling process, and the method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of steel making and rolling, and particularly relates to a method for eliminating the warping defect of a boron-containing low carbon aluminum killed steel strip. Background technique [0002] As a widely used cold-rolled base material, low-carbon aluminum-killed steel can be used to produce color-coated sheets, tin-plated sheets, home appliance sheets, etc., and widely affects various fields of construction and life. In order to meet the requirements of export tax rebates, most domestic iron and steel enterprises add boron with a content of more than 0.0008% to the steel. As a trace element, adding a small amount of boron in steel can not only improve the formability of steel, but also reduce processing brittleness. [0003] However, the addition of boron element will also bring the problem of corner cracks to the low carbon aluminum killed steel. Surface quality, unable to deliver. SUMMARY OF THE INVEN...

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Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the present invention discloses a method for eliminating warped skin defects of boron-containing low-carbon aluminum-killed steel strips, so as to solve the problem of warped skin defects at the edge of the hot-rolled steel strip in the prior art

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