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Production method for reducing surface corner transverse cracks of boron-containing steel billets produced in short process

A production method and a short-process technology, applied in the field of iron and steel metallurgy, can solve the problems of reducing horizontal cracks on the surface of boron-containing billets, and achieve the effect of solving surface cracks and reducing the precipitation of BN

Inactive Publication Date: 2022-08-05
CHANGSHU LONGTENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the horizontal cracks on the surface of the boron-containing billet of the invention still need to be further reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This example provides a production method for reducing transverse cracks on the surface of boron-containing steel billets produced in a short process, including the following steps:

[0043] Step S1, ingredients: ingredients according to the following mass percentages, C 0.23%, Si 0.15%, Mn 1.00%, P≤0.025%, S≤0.010%, Al 0.015%, Ti 0.020%, Cr 0.10% , B 0.0015%, the balance is iron and a small amount of unavoidable impurities;

[0044]Step S2, smelting: use a high-power electric arc furnace for smelting, control the ratio of molten iron to 40wt% during the smelting process, and use clean scrap steel to reduce the residual element content;

[0045] Step S3, control of the end point of the electric arc furnace: the mass percentage content of carbon in the molten steel during tapping is 0.06wt%, the tapping temperature is 1600°C, and the steel remains in the furnace and slag is retained;

[0046] Step S4, deoxidation and alloying: during the tapping process, the molten stee...

Embodiment 2

[0053] This example provides a production method for reducing transverse cracks on the surface of boron-containing steel billets produced in a short process, which is basically the same as Example 1, except that according to the following ingredients by mass percentage, C 0.24%, Si 0.20% , Mn1.10%, P≤0.025%, S≤0.010%, Al 0.025%, Ti 0.035%, Cr 0.15%, B 0.0017%, the balance is iron and a small amount of inevitable impurities; the ratio of molten iron is 45wt%; The mass percentage content of carbon in the molten steel during tapping is 0.08wt%, and the tapping temperature is 1620°C; the total amount of retained steel in step S3 is 6wt%; in step S4, the aluminum block, silicon manganese, and high manganese are The dosage is 1.0kg / t, 7.2kg / t, 6.3kg / t in turn; the white residue described in step S5 includes the following chemical components by weight percentage: CaO 57%, SiO2 6%, Al2O3 27%, MgO 6%; the drawing speed in step S6 is 2.25m / min.

Embodiment 3

[0055] This example provides a production method for reducing transverse cracks on the surface of boron-containing steel billets produced in a short process. , Mn1.15%, P≤0.025%, S≤0.010%, Al 0.045%, Ti 0.040%, Cr 0.20%, B 0.0020%, the balance is iron and a small amount of inevitable impurities; the ratio of molten iron is 50wt%; The mass percentage content of carbon in the molten steel during tapping is 0.11wt%, and the tapping temperature is 1630°C; the total amount of retained steel in step S3 is 7wt%; in step S4, the aluminum block, silicon manganese, high manganese The dosage is 1.0kg / t, 7.5kg / t, 6.5kg / t in turn; the white residue described in step S5 includes the following chemical components by weight percentage: CaO 60%, SiO2 7.5%, Al2O3 28%, MgO 6.5%; the drawing speed in step S6 is 2.30m / min.

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PUM

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Abstract

The invention provides a production method for reducing surface corner transverse cracks of a boron-containing steel billet produced in a short process. The production method comprises the following steps: step S1, burdening; step S2, smelting; s3, electric arc furnace end point control; step S4, deoxidizing and alloying; step S5, LF refining; s6, VD smelting and calcium treatment; and S7, continuous casting is conducted. By controlling the production process of the boron-containing steel, the occurrence rate of the surface corner transverse crack defect of the boron-containing steel billet can be remarkably reduced, the product quality is improved, and meanwhile, the operation rate of a casting machine is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a method for reducing the generation of surface angle transverse cracks in the production process of boron-containing steel billets, in particular to a production method for reducing the surface angle transverse cracks of boron-containing steel billets produced in a short process. Background technique [0002] Boron-containing steel is an important part of microalloyed steel. Adding boron to steel can be adsorbed on austenite grain boundaries, reduce grain boundary energy, inhibit the formation of ferrite nuclei, thereby multiplying the hardenability and work hardenability of steel. In addition, it can also improve the high temperature strength and creep strength of heat-resistant steel, and is widely used in modern steel production. However, since boron is one of the most active elements, it can form stable inclusions with residual oxygen and nitrogen in the ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C21C7/06C21C7/00C21C5/52C21C7/10C21C7/076B22D11/00B22D11/18B22D11/22B22D11/16
CPCC22C33/06C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C21C7/06C21C7/0006C21C5/52C21C7/10C21C7/076C21C7/0056C21C7/0075B22D11/001B22D11/18B22D11/225B22D11/166Y02P10/20
Inventor 张龙龙刘荣泉张志平朱勇郑晓峰赵雷华
Owner CHANGSHU LONGTENG SPECIAL STEEL
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