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A method for producing low-alloy peritectic steel by conventional slab continuous casting machine

A slab continuous casting machine and slab continuous casting technology, which are applied in the field of iron and steel smelting, can solve problems such as the easy occurrence of shock marks on cast slabs and the technical problems of mass production of low-alloy peritectic steel, so as to reduce the depth of shock marks and eliminate cracks and depression, eliminating the effect of large fluctuations in liquid level

Active Publication Date: 2018-01-16
TANGSHAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fluctuation of the liquid level caused by the phase transformation, the slab is prone to shock marks, so there are technical difficulties in the mass production of low-alloy peritectic steel under the conventional slab continuous casting machine

Method used

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with embodiment;

[0019] In the embodiment, 100t of converter, 110t of LF refining, conventional slab continuous casting (200mm), continuous casting slab width 1270mm, thickness 200mm, production of low alloy peritectic steel, a total of 3 examples.

[0020] Concrete operation steps and each process technological parameter control are as follows:

[0021] (1) Decarburization converter smelting

[0022] a. The blowing process is mainly based on decarburization and dephosphorization, which requires the whole process of slag removal, and the furnace temperature rises steadily;

[0023] b. Final slag basicity R is 3.6, mass percentage of molten steel: C=0.03%, S=0.020%, P=0.011%, temperature 1670°C;

[0024] c. Adopt self-control sliding plate to block slag, and the slag lowering is ≤5kg / t;

[0025] d. Tapping time ≥ 4min, the steel flow is round;

[0026] e. Add deoxidizer and manganese-ferroalloy to...

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Abstract

The invention discloses a method for producing low-alloy peritectic steel by a conventional slab continuous casting machine. The method comprises the technological processes of decarburization converter smelting, LF refining and slab continuous casting. Through the adjustment on the continuous casting procedures of the conventional slab continuous casting machine, the phenomenon of large liquid level fluctuation during peritectic steel pouring is eliminated, the shock mark depth of a casting blank is obviously reduced, cracks and concave parts in the surface of the casting blank are eliminated, the conventional slab continuous casting machine can produce flawless low-alloy peritectic steel in batches, and high-quality raw materials are provided for low-alloy high-strength steel stable in production performance.

Description

technical field [0001] The invention relates to a method for producing low-alloy peritectic steel by a conventional slab continuous casting machine, belonging to the technical field of iron and steel smelting. Background technique [0002] In the 1980s and 1990s, continuous casting experienced a period of great development, and traditional continuous casting of peritectic steel has also accumulated a certain amount of experience. In recent years, low-alloy peritectic steel has been used in medium slab (80-150mm) continuous casting machines, but for conventional slab continuous casting machines with a thickness of 200 mm, the liquid level of the ladle fluctuates greatly, and the cast slab is more prone to cracks. If the low-alloy peritectic steel is produced by the medium slab continuous casting machine, the production and quality requirements of the conventional slab continuous casting machine cannot be met. When the δFe+L (liquid)→γFe peritectic reaction occurs, the molten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C21C5/30C21C7/076B22D11/18
CPCB22D11/18C21C5/30C21C7/076C22C38/04Y02P10/20
Inventor 王建兴马德刚李梦英张洪波田欣刘海春李毅挺李经哲王健李波冯慧霄吕浩李梦龙路博勋王耐李建设段云祥尹宽吴艳青刘占礼
Owner TANGSHAN IRON & STEEL GROUP
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