Preparation method of boron-containing steel preventing casting blank corner cracking

A boron steel and corner cracking technology is applied in the field of preparing boron-containing steel for preventing corner cracking of casting billets, and can solve the problems such as easy cracks in the corners of boron-containing steel billets.

Active Publication Date: 2016-02-10
BENGANG STEEL PLATES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing boron-containing steel that prevents billet corner cracks, aiming to solve the problem that cracks are prone to appear at the corners of boron-containing steel billets

Method used

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  • Preparation method of boron-containing steel preventing casting blank corner cracking
  • Preparation method of boron-containing steel preventing casting blank corner cracking
  • Preparation method of boron-containing steel preventing casting blank corner cracking

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Embodiment

[0028] Example: SS400 steel

[0029] 1 According to the mass percentage of the chemical composition of boron steel, it contains: C0.17, Si0.12, Mn0.36, P0.009, S0.014, N0.0041, B0.0008; the balance is Fe.

[0030] 2 The process route is:

[0031] Hot metal pretreatment-converter smelting-external refining-ti addition-continuous casting-reheating-hot continuous rolling-inspection and storage.

[0032] 3 The main process measures of the preparation method

[0033] Steelmaking process: Traditional converter steelmaking is used for production. After tapping, argon gas is blown behind the furnace for 5 minutes, and the flow rate of argon gas is 0.4m 3 / min, argon blowing pressure 0.5MPa; starting from 1 / 4 of the tapping weight, start to add 350kg / 180 tons of aluminum and iron to the ladle for pre-deoxidation, add ferromanganese and ferrosilicon according to the content of Mn and Si in the final boron steel for alloying, and at the same time Add 500-600kg / 180 tons of active lime ...

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Abstract

The invention belongs to the field of metallurgy casting and especially relates to a preparation method of boron-containing steel preventing casting blank corner cracking. The method successively includes the steps of pretreatment to molten iron, converter smelting, external-furnace refining, continuous casting of steel blank, re-heating of a plate blank, and hot continuous rolling. The boron-containing steel includes the following components, by mass: 0.17-0.18% of C, 0.02-0.20% of Si, 0.23-1.26% of Mn, less than 0.017% of P, less than 0.014% of S, less than 0.0052% of N, 0.0005-0.0010% of B, 0.015-0.034% of Al and the balanced being Fe. During the external-furnace refining process, titanium is added according to the mass percentage ratio of 0.01-0.035%. The titanium is added to the hot-rolled boron-containing steel, so that the quality of the casting blank is significantly improved and the offline cleaning rate is reduced to 15.06%. A statistical result proves that defect rate is reduced to 1.39%. In addition, a detection and analysis result on mechanical performance of the boron-containing steel proves that the mechanical performance of the boron-containing steel is improved after the titanium is added.

Description

technical field [0001] The invention belongs to the field of metallurgical casting, and in particular relates to a method for preparing boron-containing steel for preventing billet corner cracking. Background technique [0002] Boron-containing steel is mainly medium-carbon steel, and the carbon content is mainly concentrated in 0.10% to 0.16%. The carbon content of this type of steel is in the crack sensitive area of ​​peritectic reaction. The stress concentration at the corner of the billet is prone to cracks at the corner of the billet. Most of the corner cracks appear in the upper corner (inner arc) and in the shock marks, and they are found in slabs of different widths. The general length is 3mm-12mm, and the width is 0.12mm-0.16mm. [0003] Adopting traditional control methods, including mold liquid level control, improving mold cooling conditions, changing caster casting speed, changing mold slag, etc., still cannot effectively control the occurrence of corner cracks...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/14C21C7/06C21C7/072C21C7/064
Inventor 黄健刘军王旭生王会忠李铁
Owner BENGANG STEEL PLATES
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