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A preparation method of hot-rolled wire rod for grinding and polishing cotton steel

A hot-rolled wire rod and process control technology, applied in the field of wire rod steel, can solve the problems of low wire rod strength, high steel wire creep, high wire rod, gnawing knives when scraping cotton, etc.

Active Publication Date: 2021-10-15
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using conventional pre-deoxidation slagging process, it is difficult to control the proportion of each component, especially the carbon content. Once the carbon content exceeds the preset range, the strength of the wire rod will be too low or too high, and the carbon content will be too high. The strength of the wire rod is too high, the tool is gnawed when scraping cotton, the steel wool becomes brittle, and the slag falls off; when the steel wire is drawn from the wire rod, the carbon content is too low, which will lead to low strength of the wire rod and cause the steel wire to break down when the tool is pressed down. Creep, generally suitable wire rod strength is 400-430MPa, the carbon content of the long-fiber cotton steel wire rod obtained by the method of this application is not easy to control, and usually exceeds the upper limit of the preset range, resulting in If the strength exceeds 430MPa, there is a low qualified rate of the wire rod, which affects the economic benefits of the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method for a hot-rolled wire rod for grinding and polishing cotton steel, comprising the steps of:

[0023] (1) Steelmaking:

[0024] 1.1) Desulfurization: incoming molten iron is 107 tons, and the S content in the molten iron is 0.0209%. First, spray magnesium powder in the converter, add 46kg of magnesium powder, and the treatment cycle is 42min. After the treatment, the S content in the molten iron is 0.0044%. 2.2 tons;

[0025] 1.2) Composite blowing: Then the top-bottom composite blowing process is adopted, and the end point adopts the high-drawing supplementary blowing process to obtain a C content of 0.022% at the end point of the converter;

[0026] 1.3) Tapping: Tapping temperature is 1660°C, sliding plate slag is tapped, and 1 / 4 of the tapped steel is added with ferrosilicon deoxidizer 3Kg / t and metal manganese 12Kg / t for deoxidation and alloying, and the molten steel is tapped to At 3 / 4, all manganese and ferrosilicon deoxidizers have been add...

Embodiment 2

[0033] A preparation method for a hot-rolled wire rod for grinding and polishing cotton steel, comprising the steps of:

[0034] (1) Steelmaking:

[0035] 1.1) Desulfurization: incoming molten iron is 110 tons, and the S content in the molten iron is 0.0403%. First, spray magnesium powder in the converter, add 106kg of magnesium powder, and the treatment cycle is 60min. After the treatment, the S content in the molten iron is 0.0025%. 4.2 tons;

[0036] 1.2) Composite blowing: Then the top-bottom composite blowing process is adopted, and the end point adopts the high-drawing supplementary blowing process to obtain a C content of 0.023% at the end point of the converter;

[0037] 1.3) Tapping: Tapping temperature is 1650°C, sliding plate slag is tapped, and when tapping 1 / 4, ferrosilicon deoxidizer 3.2Kg / t and metal manganese 12.5Kg / t are added along with the steel flow for deoxidation and alloying, molten steel When tapping reaches 3 / 4, all metal manganese and ferrosilicon d...

Embodiment 3

[0044] A preparation method for a hot-rolled wire rod for grinding and polishing cotton steel, comprising the steps of:

[0045] (1) Steelmaking:

[0046] 1.1) Desulfurization: incoming molten iron is 111 tons, and the S content in the molten iron is 0.0307%. First, spray magnesium powder in the converter, add 86kg of magnesium powder, and the treatment cycle is 45min. After the treatment, the S content in the molten iron is 0.0035%. 3.2 tons;

[0047] 1.2) Composite blowing: Then the top-bottom composite blowing process is adopted, and the end point adopts the high-drawing supplementary blowing process to obtain a C content of 0.0101% at the end point of the converter;

[0048] 1.3) Tapping: Tapping temperature is 1600°C, sliding plate slag is tapped, and when tapping 1 / 4, ferrosilicon deoxidizer 3.8Kg / t and metal manganese 12.2Kg / t are added along with the steel flow for deoxidation and alloying, molten steel When tapping reaches 3 / 4, all metal manganese and ferrosilicon d...

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Abstract

The preparation method of the hot-rolled wire rod for grinding and polishing cotton steel comprises the steps: (1) steelmaking: desulfurization: first desulfurize the molten iron and control the molten iron S in the converter to ≤0.005%; compound blowing: control the molten iron C: 0.010-0.030%; Tapping: Tapping for deoxidation and alloying treatment, control C: 0.05% to 0.07%, Si: 0.14% to 0.20%, Mn: 0.9% to 1.0%; after the molten steel arrives at the refining station, deoxidize the slag surface to form slag, Adjust the composition and percentage of molten steel as C: 0.05-0.08%, Si: 0.12-0.22%, Mn: 0.90-1.50%, P≤0.020%, S≤0.020%, Al S ≤0.08%; (2) continuous casting; (3) rolling. The invention effectively controls the tensile strength of the wire rod at 400-430MPa, and improves the qualification rate of the hot-rolled wire rod for grinding and polishing cotton steel.

Description

technical field [0001] The invention relates to the field of wire rod steel, in particular to a method for preparing a hot-rolled wire rod for grinding and polishing cotton steel. Background technique [0002] Hot-rolled wire rod for cotton steel is a kind of low-carbon steel with easy cutting performance and special purpose. There are two main uses. One is to scrape cotton after being drawn into steel wire to produce crushed steel wool. It is used as an additive for wear-resistant materials such as automobile brake pads. This type of application has no requirements for the length and toughness of the steel wool wire before crushing, and has lower requirements for the length and toughness of the wire rod. The second type is the hot-rolled wire rod for cotton steel, which is drawn into steel wire, and then scraped. The cotton steel produced is used for polishing and polishing materials, such as polishing of tile floors, polishing of various high-end furniture, family life and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C7/06C21C7/00C21C7/064C21D8/06
CPCC21C5/35C21C7/0006C21C7/06C21C7/0645C21D8/065
Inventor 沈金龙刘红芬雷波荣贾万军王俊
Owner 武汉钢铁有限公司