Production method of low-cost and high-strength steel plate

A high-strength steel plate and production method technology, applied in the field of metal materials, can solve problems such as increased cost of steel plate alloys, high manufacturing costs, and complicated processes, and achieve the effects of loose process systems, low cost, and simple process routes

Active Publication Date: 2014-02-26
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, precious alloy elements such as Ni are added to the steel, and the heat treatment adopts quenching and tempering processes at the same time, so that the strength and toughness of the steel plate produced meet the requirements; however, this method greatly increases the alloy cost of the steel plate, and the process is complicated. high manufacturing cost

Method used

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  • Production method of low-cost and high-strength steel plate
  • Production method of low-cost and high-strength steel plate
  • Production method of low-cost and high-strength steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The thickness of the continuous casting slab selected in Example 1 is 253mm.

[0050] During the heating process of the continuous casting slab, the temperature of the continuous casting slab out of the furnace was 1243° C., and the heating time was 373 minutes. The mass percentage of the chemical composition of the continuous casting slab includes: C0.09%, Si0.44%, Mn1.77%, P0.009%, S0.001%, Cr0.265%, Nb0.056%, V0. 059%%, Ti0.015%, Ca0.0013%, Als0.023%, the balance is Fe and unavoidable impurities.

[0051] Then the heated slab is subjected to the first-stage rolling and the second-stage rolling, and a steel plate with a thickness of 30 mm is obtained after the two-stage rolling processes are completed. Then the steel plate is cooled and heat treated, and the heat treatment time is 20 minutes.

[0052] Continuous casting slab heating, rolling, cooling and heat treatment process have little influence on the content of the chemical composition of the material of the st...

Embodiment 2

[0056] The thickness of the continuous casting slab selected in embodiment 2 is 252 mm.

[0057] During the heating process of the continuous casting slab, the temperature of the continuous casting slab out of the furnace is 1240° C., and the heating time is 370 minutes. The mass percentage of the chemical composition of the continuous casting slab includes: C0.086%, Si0.45%, Mn1.73%, P0.015%, S0.002%, Cr0.257%, Nb0.054%, V0. 058%, Ti0.014%, Ca0.0015%, Als0.023%, the balance is Fe and unavoidable impurities.

[0058] Then, the heated slab is subjected to the first-stage rolling and the second-stage rolling, and a steel plate with a thickness of 25 mm is obtained after the two-stage rolling processes are completed. Then the steel plate is cooled and heat treated, and the heat treatment time is 20 minutes.

[0059] The continuous casting slab heating, rolling, cooling and heat treatment processes have little influence on the chemical composition of the steel plate material, th...

Embodiment 3

[0063] The thickness of the continuous casting slab selected in embodiment 3 is 250mm.

[0064] During the heating process of the continuous casting slab, the temperature of the continuous casting slab coming out of the furnace is 1210° C., and the heating time is 250 minutes. The mass percentage of the chemical composition of the continuous casting slab includes: C0.08%, Si0.5%, Mn1.73%, P0.014%, S0.007%, Cr0.40%, Nb0.04%, V0. 062%, Ti0.02%, Ca0.001%, Als0.023%, the balance is Fe and unavoidable impurities.

[0065] Then the heated slab is subjected to the first-stage rolling and the second-stage rolling, and a steel plate with a thickness of 20 mm is obtained after the two-stage rolling processes are completed. Then the steel plate is cooled and heat treated, and the heat treatment time is 20 minutes.

[0066] Continuous casting slab heating, rolling, cooling and heat treatment process have little influence on the content of the chemical composition of the material of the ...

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Abstract

The invention discloses a low-cost and high-strength steel plate. A material of the steel plate includes the following chemical components by weight: 0.08-0.10% of C, 0.3-0.5% of Si, 1.5-1.8% of Mn, no more than 0.015% of P, no more than 0.007% of S, 0.2-0.4% of Cr, 0.04-0.06% of Nb, 0.04-0.07% of V, 0.008-0.02% of Ti, 0.0010-0.0025% of Ca, 0.015-0.03% of Als and the balance of iron and impurities. The invention also discloses a production method of the low-cost and high-strength steel plate. The method comprises the steps of continuous casting heating, rolling, cooling and heat treatment. The steel plate provided by the invention has yield strength and impact toughness met the requirements and eliminates expensive alloy like Mo; and a TMCP and tempering process are employed for production to realize simple process and low cost.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a low-cost high-strength steel plate and a production method thereof. Background technique [0002] With the development of the machinery industry and other construction industries, higher and higher requirements are put forward for steel materials. Generally, the steel materials used are required to have high comprehensive mechanical properties and good welding performance. High comprehensive mechanical properties can reduce the amount of materials used in equipment or buildings, and reduce the weight of the equipment itself; good welding performance can improve production efficiency and weldment quality. [0003] Now the coal machinery industry and other construction industries are in great need of high-strength structural steel with a yield strength above 500MPa and good impact toughness and weldability. Therefore, how to economically and efficiently produce steel plates with a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C21D8/02
Inventor 温利军董瑞峰吴鹏飞王皓刘泽田
Owner INNER MONGOLIA BAOTOU STEEL UNION
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