Method for producing wear-resistant steel by employing plate blank secondary-cooling area electromagnet to stir

An electromagnetic stirring, wear-resistant steel technology, applied in the production field of wear-resistant steel, can solve the problems of reducing the degree of carbon segregation, difficult to control production conditions, etc., and achieve the effect of improving quality and quality

Active Publication Date: 2018-12-25
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The Chinese patent with the publication number CN106552910A is titled "A Continuous Casting Method for Reducing Carbon Segregation of Carbon Steel Continuous Casting Round Billets in Wind Power", which effectively reduces the degree of carbon segregation and meets the strict carbon segregation requirements of carbon steel in wind power. requirements, but due to the production under the condition of the terminal electromagnetic stirring parameter of 200A / 3.0Hz, the production conditions are harsh and difficult to control, so that the carbon steel continuous casting round billets obtained in wind power still have a large degree of frame segregation, White bright belt negative segregation, carbon segregation and other quality problems

Method used

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  • Method for producing wear-resistant steel by employing plate blank secondary-cooling area electromagnet to stir
  • Method for producing wear-resistant steel by employing plate blank secondary-cooling area electromagnet to stir
  • Method for producing wear-resistant steel by employing plate blank secondary-cooling area electromagnet to stir

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Effect test

Embodiment 1

[0022] Such as figure 1 As shown, the present embodiment is a production method of common wear-resistant steel, comprising the following steps:

[0023] (1) Pretreatment: the molten iron that the S content is 0.09%, the Si content is 1.35%, and the P content is 0.27% is pretreated, and the S content in the molten iron is controlled to be 0.005% after the pretreatment;

[0024] (2) Converter smelting: send the molten iron into the converter for smelting, keep the P content in the molten iron at 0.19%, the temperature T at 1000°C before entering the furnace, control the molten steel temperature at 1400°C during tapping, and control the tapping time at 2min. During the tapping process, deoxidizer, refining slag and lime are added according to the oxygen content in the molten steel and the control target requirements for one-time deoxidation, and the slag blocking plug and slag blocking cone are used to block the slag tapping for tapping;

[0025] (3) Refining: The molten steel i...

Embodiment 2

[0029] Such as figure 2 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment is a 450-grade wear-resistant steel with a carbon content of 0.16%, a Ceq of 0.65, and a production method for a 2000*260 section blank, including the following steps:

[0030] (1) Pretreatment: the molten iron with an S content of 0.05%, a Si content of 1.20%, and a P content of 0.16% is pretreated, and the S content in the molten iron is controlled to be 0.002% after pretreatment;

[0031] (2) Converter smelting: send the molten iron into the converter for smelting, keep the P content in the molten iron at 0.15%, the temperature T at 1150°C before entering the furnace, control the molten steel temperature at 1650°C during tapping, and control the tapping time at 6 minutes, During the tapping process, deoxidizer, refining slag and lime are added according to the oxygen content in the molten steel and the control target requirements to perform a deoxidation; the s...

Embodiment 3

[0036] Such as image 3 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment is a 450-grade wear-resistant steel with a carbon content of 0.18%, a Ceq of 0.69, and a production method for a 2500*260 section blank, including the following steps:

[0037] (1) Pretreatment: the molten iron that the S content is 0.07%, the Si content is 1.25%, and the P content is 0.17% is pretreated, and the S content in the molten iron after the control pretreatment is 0.002%;

[0038] (2) Converter smelting: send the molten iron into the converter for smelting, keep the P content in the molten iron at 0.15%, the temperature T at 1150°C before entering the furnace, control the molten steel temperature at 1700°C during tapping, and control the tapping time at 10 minutes. During the tapping process, deoxidizer, refining slag and lime are added according to the oxygen content in the molten steel and the control target requirements to perform a deoxidation; the sla...

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Abstract

The invention discloses a method for producing wear-resistant steel by employing a plate blank secondary-cooling area electromagnet to stir. The method comprises the following steps of firstly, pre-processing molten iron; and secondly, performing smelting to obtain vacuum degassing molten steel by a converter, and performing continuous casting after the molten steel is refined to obtain the wear-resistant steel. The size of a current is reduced during the stirring process of the electromagnet, a pull speed is adjusted according to the size requirement of a fraction surface of the wear-resistant steel and an action position of electromagnetic stirring, and a pair of electromagnetic stirring rollers is employed. In the wear-resistant steel fabricated by the method, a frame segregation or white band negative segregation band phenomenon is eliminated, the problem of quality of the wear-resistant steel during the application process is not occurred, and the quality of the wear-resistant steel is greatly improved.

Description

technical field [0001] The invention relates to a production method of wear-resistant steel, in particular to a method for producing wear-resistant steel by electromagnetic stirring in a slab secondary cooling zone. Background technique [0002] Due to the harsh working conditions of wear-resistant steel plates, the quality requirements of wear-resistant steel itself are relatively high. Wear-resistant steel is mainly designed according to the idea of ​​high carbon equivalent and high alloy. At present, during the production of wear-resistant steel, internal defects such as central segregation, central porosity, shrinkage cavity and V-shaped segregation are easily formed during the solidification process of continuous casting slabs, thereby reducing the ductility, hydrogen-induced crack resistance and welding of steel. performance etc. Under conventional continuous casting conditions, the occurrence of center segregation defects is difficult to avoid, but the electromagneti...

Claims

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Application Information

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IPC IPC(8): B22D11/115B22D11/22B22D11/16C21C7/06C21C7/10
CPCB22D11/115B22D11/16B22D11/225C21C7/0056C21C7/06C21C7/10
Inventor 刘通吴伟勤靳建锋冯巍
Owner NANJING IRON & STEEL CO LTD
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