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Method for producing thin gauge wear-resistant steel by thin slab continuous casting and rolling process

A thin slab continuous casting and wear-resistant steel technology, which is applied in the field of wear-resistant steel plate manufacturing, can solve the problems of high price, long delivery cycle, and large consumption, so as to improve the ratio of strength and toughness, reduce usage, and reduce production costs Effect

Active Publication Date: 2019-08-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High hardness, high strength, high wear resistance, relatively large consumption (the annual consumption of low-alloy wear-resistant steel plate in China is about 1 million tons, and a large number of wear-resistant cast steel and high manganese steel are gradually being replaced) At present, domestic products with specifications of 10mm and below are used in a small amount, mainly using the hardox series of SSAB in Sweden, with high prices and long lead times.

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 by a thin-slab continuous casting and rolling process, comprising the steps of:

[0028] (1) The qualified molten iron with a molten iron temperature of 1255°C and [S] of 0.019% (mass percentage of S in molten iron) is first subjected to slag removal treatment, and the blunt iron is determined according to the temperature, weight and sulfur content requirements of the incoming molten iron. The injection amount of magnesium chloride is used to remove S by spraying and passivating magnesium, and after the injection, carry out thick slag and full slag removal treatment, the slag removal rate is 95%, and the end point [S] of molten iron is 0.0010% (mass percentage of S in molten iron) , the whole process of argon blowing is adopted, and the final slag alkalinity is 3.5;

[0029] (2) Carry out converter smelting, use pellets as coolant, pellets and iron oxide scale must be added in accordance with relevant regulations; f...

Embodiment 2

[0044] A method for producing thin-gauge wear-resistant steel by a thin-slab continuous casting and rolling process, comprising the steps of:

[0045] (1) The qualified molten iron with a molten iron temperature of 1295°C and [S] of 0.015% (mass percentage of S in molten iron) is first subjected to slag removal treatment, and the blunt iron is determined according to the temperature, weight and sulfur content requirements of the incoming molten iron. The injection amount of magnesium chloride is used to spray and passivate magnesium to remove S, and after the injection, carry out thick slag and full slag removal treatment, the slag removal rate is 96%, and the end point [S] of molten iron is 0.0010% (mass percentage of S in molten iron) , the whole process of argon blowing is adopted, and the final slag alkalinity is 3.9;

[0046] (2) Carry out converter smelting, use pellets as coolant, pellets and iron oxide scale must be added in accordance with relevant regulations; fluori...

Embodiment 3

[0061] A method for producing thin-gauge wear-resistant steel by a thin-slab continuous casting and rolling process, comprising the steps of:

[0062] (1) The qualified molten iron with a molten iron temperature of 1255°C and [S] of 0.019% (mass percentage of S in molten iron) is first subjected to slag removal treatment, and the blunt iron is determined according to the temperature, weight and sulfur content requirements of the incoming molten iron. The injection amount of magnesium chloride is used to remove S by spraying and passivating magnesium, and after the injection, carry out thick slag and full slag removal treatment, the slag removal rate is 95%, and the end point [S] of molten iron is 0.0010% (mass percentage of S in molten iron) , the whole process of argon blowing is adopted, and the final slag alkalinity is 3.0;

[0063] (2) Carry out converter smelting, use pellets as coolant, pellets and iron oxide scale must be added in accordance with relevant regulations; f...

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Abstract

The invention discloses a method for producing thin gauge wear-resistant steel NM450 through a thin slab continuous casting and rolling technology. The method comprises the steps of blast furnace hot metal preparation, hot metal pretreatment, converter melting, RH furnace refining, LF furnace refining, thin slab continuous casting, heating in a heating furnace, high pressure water dephosphorizeing, operation of a hot continuous rolling mill, superfast cooling, reeling, leveling, heating, quenching, tempering, finishing and inspection. Through the reasonable alloying design, traces of alloys of Cu, Mo, Cr, Nb, Ti and B are selected for microalloying; a microstructure is controlled by controlling superfast cooling and quenching after rolling, the performance strengthening effect of the alloys is given to full play, and the adding amount of the alloys and the using amount of the precious alloys are reduced; and compared with a traditional technology, by adopting the method, energy consumption is reduced, the technical process is shortened, the adding amount of alloys is reduced, the toughness ratio of steel is improved, social resources are 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 by a thin-slab continuous casting and rolling process. Background technique [0002] Wear-resistant and heat-resistant steel parts are widely used in high-temperature oxidizing atmospheres and abrasive wear conditions. The performance of these parts directly affects the normal operation of the entire equipment. Not only do materials require high-temperature strength and certain wear resistance, but also Only with good oxidation resistance can it meet the requirements of its performance. The use of parts with good performance and long life can not only greatly reduce material consumption and production costs, but also have good economic benefits and ensure safe production, improve equipment operation efficiency, reduce equipment maintenance workload, reduce labor intensity, and imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/072C21C7/06C21C7/076C21C5/28C21D8/02C21D1/18C21D9/46B21B1/46
CPCB21B1/463C21C5/28C21C7/0006C21C7/06C21C7/0645C21C7/072C21C7/076C21C2007/0018C21D1/18C21D8/0226C21D9/46Y02P10/20
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