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A method for producing thin-gauge wear-resistant steel nm400 by ultra-fast cold on-line quenching

An ultra-fast cooling, wear-resistant steel technology, applied in the field of wear-resistant steel plate manufacturing, can solve the problems of difficult delivery time, difficult production of thin specifications, difficult to ensure plate shape, etc., to improve the ratio of strength and toughness, and reduce the amount of addition. and the use of precious alloys, the effect of reducing the amount of addition

Active Publication Date: 2019-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional production process of wear-resistant steel plate is: electric furnace (converter) smelting→refining→continuous casting→heating→rough rolling→intermediate billet→finish rolling→heat treatment→inspection and storage. At present, the main domestic manufacturers include Wugang, Wuhan Iron and Steel, Baosteel , Nangang, using medium and thick plate rolling mill or hot continuous rolling mill to produce thicker gauge products, thin gauge production is difficult, production cost is high, plate shape is difficult to guarantee, production cycle is long, delivery time is difficult to guarantee, due to domestic thin gauge wear-resistant The output of steel plates is very small, it is difficult to meet the needs of the domestic market, coupled with the advantages of foreign products in quality, and the clear requirements of some foreign-funded construction machinery manufacturing units for wear-resistant steel materials, resulting in more foreign wear-resistant steel plates in the domestic market. Possession and higher market price

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for producing thin-gauge wear-resistant steel NM400 by ultra-fast cold on-line quenching, comprising steps:

[0028] (1) The temperature is 1255 ℃, [S] is 0.019% (mass percentage of S in molten iron) qualified molten iron is first desulfurized by KR, and after desulfurization is completed, slag removal treatment is carried out. The bright area of ​​molten iron is 95%, and the end point of molten iron is [ S] is 0.0010% (mass percentage of S in molten iron), the whole process adopts argon blowing process, and the final slag alkalinity is 3.5;

[0029] (2) Carry out converter smelting, add pellets and iron oxide scale as coolant; fluorite is added in batches in an amount of 3.1kg per ton of steel, and it is strictly forbidden to add fluorite 2 minutes before the end of blowing, using slag blocking cones and slag blocking plugs Double-stop slag tapping, slag thickness is 44mm, converter tapping with ferrosilicon for deoxidation and alloying;

[0030] (3) Refining...

Embodiment 2

[0043] A method for producing thin-gauge wear-resistant steel NM400 by ultra-fast cold on-line quenching, comprising steps:

[0044] (1) The qualified molten iron with a temperature of 1255°C and [S] of 0.012% (the mass percentage of S in the molten iron) is first subjected to KR desulphurization, and after desulphurization is completed, the slag removal treatment is carried out. The bright area of ​​the molten iron is 94%, and the end point of the molten iron is [S ] is 0.0010% (mass percentage of S in molten iron), adopts the whole process of blowing argon, and the final slag basicity is 3.0;

[0045] (2) Add pellets and iron oxide scale as coolant, fluorite is added in batches at a rate of 3.0kg per ton of steel, and it is strictly forbidden to add fluorite 2 minutes before the end of blowing, and use slag-stopping cones and slag-stopping plugs to carry out double-blocking slag discharge Steel, with a slag thickness of 40mm, deoxidized and alloyed with ferrosilicon for tapp...

Embodiment 3

[0060] A method for producing thin-gauge wear-resistant steel NM400 by ultra-fast cold on-line quenching, comprising steps:

[0061] (1) The temperature is 1295 ℃, [S] is 0.017% (mass percentage of S in molten iron) molten iron is first desulfurized by KR, and after desulfurization is completed, slag removal treatment is carried out. The bright area of ​​molten iron is 95%, and the end point of molten iron is [S ] is 0.0010% (mass percentage of S in molten iron), adopts the whole process of blowing argon, and the final slag basicity is 4.0;

[0062] (2) Add pellets and iron oxide scale as coolant; fluorite is added in batches at an amount of 4.0kg per ton of steel, and fluorite is strictly prohibited 2 minutes before the end of blowing, and slag blocking cones and slag blocking plugs are used for double slag blocking. Steel, with a slag thickness of 35mm, deoxidizes and alloys with ferrosilicon for tapping from the converter;

[0063] (3) Refining in RH furnace. After reachin...

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Abstract

The invention discloses a method for producing thin-specification wear-resistant steel NM400 through ultra-fast cooling on-line quenching. The method comprises the steps of pretreating blast-furnace melt, carrying out converter smelting, refining through an RH furnace, refining through an F furnace, continuously casting conventional slabs, cooling to the room temperature, checking the slabs, scaling the surface of a casting blank, heating in a heating furnace, dephosphorizing through high pressure water, roughing, dephosphorizing through high pressure water, finish rolling, carrying out ultra-fast cooling quenching, coiling, preserving heat through a heat preservation pit, uncoilingsmoothing, finishing and checking. According to the method provided by the invention, through a reasonable alloying design, traces of Cu, Mo, Cr, Nb, Ti and B alloys are selected for microalloying; through controlling a microstructure through by virtue of controlling ultra-fast cooling quenching after controlled rolling, a performance enhancing function of the alloys is fully played, the addition of the alloys and the usage amount of precious alloy are reduced, and a process is simplified; compared with a traditional process, the energy consumption is reduced, the process flow is shortened, the alloy addition is reduced, the toughness ratio of steel is improved, the social resource is saved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant steel plate manufacturing. In particular, it relates to a method for producing thin-gauge wear-resistant steel NM400 by ultrafast cold on-line quenching. Background technique [0002] Wear-resistant steel is a steel that resists abrasive wear, and is widely used in various industrial and agricultural productions such as metallurgy, mining, building materials and military where anti-wear is required. Among them, wear-resistant steel plates are the most widely used. The industry is construction machinery manufacturing, and the final uses are metallurgy, coal, cement, electric power, glass, mining, building materials, ceramics, bricks, agriculture and forestry and other industries. [0003] The traditional production process of wear-resistant steel plate is: electric furnace (converter) smelting→refining→continuous casting→heating→rough rolling→intermediate billet→finish rolling→heat treatmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/20C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38C22C38/02C21D8/02
CPCC21D8/0226C21D8/0263C22C33/04C22C38/02C22C38/20C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 李烈军周峰高吉祥彭政务孙海波戴杰涛鲁艳军
Owner SOUTH CHINA UNIV OF TECH