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Method for producing thin-gauge wear-resistant steel nm450 by hot continuous rolling ultra-fast cooling process

An ultra-fast cold and hot continuous rolling technology, which is applied in the field of wear-resistant steel plate manufacturing, can solve the problems of difficult delivery time, thin-gauge production, and plate shape, so as 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: 2019-07-12
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

[0031] A method for producing thin-gauge wear-resistant steel NM450 by a hot continuous rolling ultra-fast cooling process, comprising steps:

[0032] (1) Desulphurize molten iron with a temperature of 1300°C and [S] of 0.010% (mass percentage of S in molten iron) by KR, and then fully remove slag, and remove slag from the molten iron until the bright area of ​​the molten iron reaches 95%, reducing the return of S in the converter , the molten iron endpoint [S] is 0.0010% (mass percentage of S in molten iron);

[0033] (2) Carry out converter smelting, the first 8 furnaces before the converter is newly opened and the first 3 furnaces after the repair are not allowed to smelt this steel type, pellets are used as coolant, pellets and iron oxide scale must be added as required; fluorite should be based on The slag in the furnace is added in small amounts in batches, the amount added per ton of steel is 3.0kg, and when double slag is ≤4.8kg per ton of steel, it is strictly forbidd...

Embodiment 2

[0050] A method for producing thin-gauge wear-resistant steel NM450 by a hot continuous rolling ultra-fast cooling process, comprising steps:

[0051] (1) The molten iron with a temperature of 1295°C and [S] of 0.018% (mass percentage of S in molten iron) is subjected to KR desulphurization, and then thickened slag and full slag removal are carried out. Reduce return S in the converter, the end point [S] of molten iron is 0.0010% (mass percentage of S in molten iron);

[0052] (2) The first 8 furnaces before the new furnace start-up and the first 3 furnaces after major repairs shall not smelt this steel type, and use pellets as coolant, pellets and iron oxide scale must be added as required; fluorite should be based on the slag in the furnace Add in a small amount in batches, 3.5kg per ton of steel, 5.0kg per ton of steel when there is double slag, and it is strictly forbidden to add fluorite 2 minutes before the end of blowing. Use slag blocking cones and slag blocking plugs ...

Embodiment 3

[0069] A method for producing thin-gauge wear-resistant steel NM450 by a hot continuous rolling ultra-fast cooling process, comprising steps:

[0070] (1) The molten iron with a temperature of 1290°C and [S] of 0.018% (mass percentage of S in molten iron) is subjected to KR desulphurization, and then thickened slag and full slag removal are carried out. Reduce S return in the converter, the end point [S] of molten iron is 0.0010% (mass percentage of S in molten iron), argon blowing process is adopted throughout, and the final slag alkalinity is 3.2;

[0071] (2) The first 8 furnaces before the new furnace start-up and the first 3 furnaces after major repairs shall not smelt this steel type, and use pellets as coolant, pellets and iron oxide scale must be added as required; fluorite should be based on the slag in the furnace Add in a small amount in batches, 3.2kg per ton of steel, 4.5kg per ton of steel for double slag, fluorite is strictly prohibited 2 minutes before the end ...

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Abstract

The invention discloses a method for producing thin-specification wear-resistant steel NM450 by a hot continuous rolling ultra-fast cooling process. The method comprises the following steps of blast-furnace iron melting, KR desulfurization, converter operation, RH furnace refining, LF furnace refining, conventional plate blank continuous casting, cooling to room temperature, plate blank inspection, casting blank surface peeling, furnace heating, high-pressure water dephosphorization, rough rolling, high-pressure water dephosphorization, fine rolling, ultra-fast cooling, rolling, unfolding leveling, heating, quenching, tempering, finishing and inspection. Through the reasonable alloy design, the trace Cu, Mo, Cr, Nb, Ti and B alloy are selected for microalloying; microscopic tissues are controlled through controlling the ultra-fast cooling quenching after the rolling; the alloy performance reinforcing effect is sufficiently achieved; the alloy addition and the precious metal consumption are reduced; the process is simplified. Compared with a conventional process, the method provided by the invention has the advantages that the energy consumption is reduced; the technical flow process is reduced; the alloy addition quantity is reduced; the steel toughness proportion is improved; the social resources are reduced; the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant steel plate manufacturing, and in particular relates to a method for producing thin-gauge wear-resistant steel NM450 by a hot continuous rolling ultra-fast cooling process. 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 rol...

Claims

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Application Information

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