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Production method of high-hardness low-carbon low-alloy steel plate

An alloy steel plate and a production method technology, applied in the metallurgical field, can solve the problems of low life of the steel plate, deformation of the surface of the drum, etc., and achieve the effect of reducing the cost of the alloy

Inactive Publication Date: 2019-01-11
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of use, especially in the use of complex working conditions, the steel plates produced according to this standard generally have problems such as low service life and deformation of the surface of the drum.

Method used

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  • Production method of high-hardness low-carbon low-alloy steel plate
  • Production method of high-hardness low-carbon low-alloy steel plate
  • Production method of high-hardness low-carbon low-alloy steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: 22mm steel plate production method

[0015] Key process steps include:

[0016] 1) Converter steelmaking: Add 125t of molten iron and 30t of scrap steel into the converter for smelting, add 2532kg of silicon-manganese alloy and 108kg of aluminum-iron deoxidation, 300kg of lime, and 200kg of synthetic slag during tapping.

[0017] 2) Refining outside the furnace: add 400kg of lime, 300kg of synthetic slag, 300kg of silicon-manganese alloy, 0.17% of outbound C, 1.26% of Mn, and superheat of molten steel at 12-15°C.

[0018] 3) Continuous casting: the whole process is protected by argon gas, and the section of the billet is 260×2100mm.

[0019] 4) Heating: The temperature out of the furnace is 1163°C, and the time in the furnace is 251 minutes.

[0020] 5) Rolling: Stage I rolling temperature is 1106°C, intermediate billet is 80mm, stage II rolling temperature is 930°C, final rolling temperature is 836°C, and reddening temperature is 560°C.

[0021] 6) Acc...

Embodiment 2

[0023] Embodiment 2: 40mm steel plate production method

[0024] Key process steps:

[0025] 1) Converter steelmaking: Add 125t of molten iron and 30t of scrap steel into the converter for smelting, add 2709kg of silicon-manganese alloy and 98kg of aluminum-iron deoxidation, 300kg of lime, and 200kg of synthetic slag during the tapping process of the converter.

[0026] 2) Refining outside the furnace: add 500kg of lime, 380kg of synthetic slag, 326kg of silicon-manganese alloy, 0.20% of outbound C, 1.42% of Mn, and superheat of molten steel at 12-15°C.

[0027] 3) Continuous casting: the whole process is protected by argon gas. The billet section is 260×2100mm.

[0028] 4) Heating: The temperature out of the furnace is 1178°C, and the time in the furnace is 223 minutes.

[0029] 5) Rolling and cooling: The rolling temperature of the first stage is 1100°C, the intermediate billet is 80mm, the rolling start temperature of the second stage is 920°C, and the final rolling temp...

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Abstract

The invention discloses a production method of a high-hardness low-carbon low-alloy steel plate. The production method comprises the technology route of convertor smelting, external refining, continuous casting, heating, rolling and accelerated cooling after rolling. Steel is prepared from the compositions in percentage by mass: 0.16-0.20% of C, 0.10-0.40% of Si, 1.20-1.50% of Mn, no more than 0.025% of P, no more than 0.015% of S, no less than 0.006% of Al and the balance Fe and inevitable impurities. According to the production method of the high-hardness low-carbon low-alloy steel plate, bycontrolling steelmaking technologies of convertor smelting, LF refining and the like, the compositions of molten steel are ensured; by controlling the superheat degree in the continuous casting process, the quality of a continuous cast billet is ensured; austenite grains are refined through large-reduction slow rolling at the stage I, and the amount of deformed austenite is increased through large-compression-ratio rolling at the stage II; and the rolling temperature and the technology of accelerated cooling after rolling are precisely controlled, and finally, the high-hardness steel plate comprising the structures of pseudo-eutectic ferrite and a small amount of bainite and ferrite is obtained, wherein the pseudo-eutectic ferrite is the main part of the high-hardness steel plate. The thickness range of the steel plate produced through the production method is 16-50 mm.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a production method of a high-hardness, low-carbon and low-alloy steel plate, which is suitable for making rollers of road rollers. Background technique [0002] At present, the steel used for roller rollers is basically Q345 low-alloy steel plate. During use, due to the ever-changing working conditions, these Q345 low-alloy steel plates have great differences in service life and environmental adaptability. The steel used for the roller rollers of each construction machinery manufacturer is ordered according to the Chinese national standard GB / T 1591-2008, and there are no other special requirements except for the general strength and toughness requirements. In the process of use, especially in the use of complex working conditions, the steel plates produced according to this standard generally have problems such as low service life and deformation of the surface of the drum. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06
CPCC21D8/0226C21D2211/002C21D2211/005C22C38/002C22C38/02C22C38/04C22C38/06Y02P10/20
Inventor 周光杰张勇伟刘晓玮金韬陈志斌陈钊龚立国
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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