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A method for producing thin-gauge high-ti wear-resistant steel nm400 by on-line quenching

A wear-resistant steel and thin-gauge technology, applied in the field of wear-resistant steel plate manufacturing, can solve the problems of difficult to guarantee delivery time, difficult to produce thin gauges, difficult to ensure plate shape, etc. The amount of precious alloy used and the effect of reducing the amount of alloy added

Active Publication Date: 2018-09-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main domestic manufacturers include Wugang, Wuhan Iron and Steel, Baosteel, and Nangang, all of which are produced by medium and thick plate rolling mills or hot continuous rolling. It is difficult to produce thin gauges, the production cost is high, the shape of the plates is difficult to guarantee, the production cycle is long, and the delivery Difficult to guarantee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of method that on-line quenching produces thin specification high Ti wear-resistant steel NM400, comprises steps:

[0025] (1) The qualified molten iron with a temperature > 1250°C and [S] ≤ 0.020% (mass percentage of S in molten iron) is first subjected to slag removal treatment. The amount of magnesium injection, after the injection, carry out thick slag and full slag removal treatment, the end point [S] of molten iron is 0.0020%;

[0026] (2) Carry out converter smelting, use pellets as coolant, pellets and iron oxide scale must be added according to relevant regulations; fluorite should be added in small amounts in batches according to the slag in the furnace, the amount of steel added per ton is 3.8kg, blowing It is strictly forbidden to add fluorite 2 minutes before the end point. Use slag-stopping cones and slag-stopping plugs for double-blocking slag tapping. The slag thickness is 48mm. During the tapping process of the converter, a step-by-step deoxidati...

Embodiment 2

[0038] A kind of method that on-line quenching produces thin specification high Ti wear-resistant steel NM400, comprises steps:

[0039] (1) The qualified molten iron with a temperature > 1250°C and [S] ≤ 0.020% (mass percentage of S in molten iron) is first subjected to slag removal treatment. The amount of magnesium injection, after the injection, carry out thick slag and full slag removal treatment, the end point [S] of molten iron is 0.0020%;

[0040] (2) Carry out converter smelting, use pellets as coolant, pellets and iron oxide scale must be added in accordance with relevant regulations; fluorite should be added in small batches according to the slag in the furnace, the amount of 3.2kg per ton of steel, blowing It is strictly forbidden to add fluorite 2 minutes before the end point. Use slag-stop cones and slag-stop plugs for double-stop slag tapping. The slag thickness is 40mm. During the converter tapping process, a step-by-step deoxidation process is used for deoxida...

Embodiment 3

[0052] A kind of method that on-line quenching produces thin specification high Ti wear-resistant steel NM400, comprises steps:

[0053] (1) The qualified molten iron with a temperature > 1250°C and [S] ≤ 0.020% (mass percentage of S in molten iron) is first subjected to slag removal treatment. The amount of magnesium injection, after the injection, carry out thick slag and full slag removal treatment, the end point [S] of molten iron is 0.0020% (mass percentage of S in molten iron);

[0054] (2) Carry out converter smelting, use pellets as coolant, pellets and iron oxide scale must be added according to relevant regulations; fluorite should be added in small amounts in batches according to the slag in the furnace, the amount added per ton of steel is 4kg, and the blowing end point It is strictly forbidden to add fluorite in the first 2 minutes. Use slag-stopping cones and slag-stopping plugs to carry out double-stopping slag tapping. The slag thickness is 45mm. During the tap...

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Abstract

The invention discloses a method for producing thin-specification, high-Ti and wear-resisting steel NM400 through online quenching. The method comprises the steps of blast furnace molten iron pretreatment, converter smelting, LF furnace refining, RH furnace refining, sheet billet continuous casting, heating furnace and high-pressure water dephosphorization, hot continuous rolling unit adopting, ultrafast cooling and quenching, rolling, heat preservation pit heat preservation, flattening, finishing and checkout. By means of reasonable alloying design, trace Mo, Cr, Nb, Ti and B alloy is selected for micro alloying, a microstructure is controlled by controlling ultrafast cooling and quenching after rolling, the performance reinforcing function of the alloy is fully achieved, and the alloy adding amount and the precious metal use amount are reduced; and a traditional wear-resistant steel offline quenching and tempering process after hot rolling is simplified, the process flow is shortened, the alloy adding amount is reduced, after ultrafast cooling is carried out after rolling, the hardenability of a steel plate is improved by 1.4-1.5 times than that of a traditional re-heating quenching process, the toughness ratio of steel is increased, 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 high Ti wear-resistant steel NM400 by on-line quenching. 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 improve worker labor. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/38C22C38/32C22C38/28C22C38/26C22C38/22C22C38/02C22C38/04C21D8/02C21D1/18C21C7/06C21C7/064C21C7/10
CPCC21C7/0006C21C7/06C21C7/064C21C7/10C21D1/18C21D8/0226C21D8/0263C22C33/06C22C38/02C22C38/04C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38
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
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