Non-quenched and tempered steel plate and production method thereof

A technology of non-quenched and tempered steel and production method, which is applied in the field of steel plate rolling, can solve the problems of segregation of C and Mn elements, and achieve the effects of reducing grain boundary strengthening, fine and uniform structure, and delaying the precipitation of cementite in the structure

Inactive Publication Date: 2021-05-11
TANGSHAN IRON & STEEL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main principle of the composition design of the present invention is that the use of part of Cr and Cu elements not only makes up for the deficiency of solid solution strengthening, but also improves hardenability in the cooling process to reduce carbide precipitation, and can solve the problem of segregation of part of C and Mn elements

Method used

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  • Non-quenched and tempered steel plate and production method thereof
  • Non-quenched and tempered steel plate and production method thereof
  • Non-quenched and tempered steel plate and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The chemical composition of the plate and its weight percentage are shown in Table 1. The production process includes continuous casting, slab heating, rough rolling, finishing, laminar cooling, stack cooling, and continuous casting. 400A, the slab is surface quenched at the end of continuous casting, the surface of the slab is cooled to 350°C, and the reddening temperature of the slab is 450°C. In the slab heating process, the slab temperature is heated to 1100°C, and the total heating time is calculated according to the thickness of 4.5min / cm. In the rough rolling process, the single-pass reduction rate is 15%, and the total reduction rate is 50%. In the finishing rolling process, the single-pass reduction rate is 10%, and the total reduction rate is 30%; the opening rolling temperature is 850 °C, and the final rolling temperature is 750 °C. In the laminar cooling process, the final cooling temperature is 550°C. In the stacking cooling process, after the straighteni...

Embodiment 2

[0026] The chemical composition of the plate and its weight percentage are shown in Table 1. The production process includes continuous casting, slab heating, rough rolling, finishing, laminar cooling, stack cooling, and continuous casting. At 350A, the slab is surface quenched at the end of continuous casting, the surface of the slab is cooled to 377°C, and the reddening temperature of the slab is 473°C. In the slab heating process, the slab temperature is heated to 1117°C, and the total heating time is calculated according to the thickness of 4.71 min / cm. In the rough rolling process, the single-pass reduction rate is 16.4%, and the total reduction rate is 53.7%. In the finishing rolling process, the single-pass reduction rate is 12%, and the total reduction rate is 33.3%; the opening rolling temperature is 864 °C, and the final rolling temperature is 767 °C. In the laminar cooling process, the final cooling temperature is 573°C. In the stack cooling process, after the str...

Embodiment 3

[0028] The chemical composition of the plate and its weight percentage are shown in Table 1. The production process includes continuous casting, slab heating, rough rolling, finishing, laminar cooling, stack cooling, and continuous casting. 420A, the slab is surface quenched at the end of continuous casting, the slab surface is cooled to 406°C, and the reddening temperature of the slab is 498°C. In the slab heating process, the slab temperature is heated to 1132°C, and the total heating time is calculated according to the thickness of 4.93 min / cm. In the rough rolling process, the single-pass reduction rate is 17.8%, and the total reduction rate is 57%. In the finishing rolling process, the single-pass reduction rate is 13%, and the total reduction rate is 36.5%; the opening rolling temperature is 877 °C, and the final rolling temperature is 781 °C. Laminar cooling process, the final cooling temperature is 599 ℃. In the stacking cooling process, after the straightening is co...

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Abstract

The invention relates to a non-quenched and tempered steel plate and a production method thereof, and belongs to the technical field of steel plate rolling. The non-quenched and tempered steel plate comprises the following chemical components in percentage by weight: 0.15 to 0.19 percent of C, 0.20 to 0.50 percent of Si, 0.7 to 0.89 percent of Mn, 0.0001 to 0.035 percent of P, 0.04 to 0.07 percent of S, 0.30 to 0.50 percent of Cr, 0.15 to 0.20 percent of Cu, 0.025 to 0.05 percent of Al, and the balance of Fe and inevitable impurities, wherein Mn / Cr is 2.0 to 3.0, Mn / Cu is 3.5 to 5.0, and Cr / Cu is 1.5 to 2.5. According to the non-quenched and tempered steel plate provided by the invention, a fine and uniform tissue form is obtained in a mode of delaying the tissue cementite precipitation and preventing grain growth by using second-phase particles of microalloy elements.

Description

technical field [0001] The invention belongs to the technical field of steel plate rolling, and in particular relates to a non-quenched and tempered steel plate and a production method thereof. Background technique [0002] In the current production process, non-quenched and tempered steel sheets have gradually replaced the production of quenched and tempered steel sheets due to the simplification of the heat treatment production process. Grain effect improves the toughness and maintains the strength of the steel, but it reduces the time and cost of the heat treatment process and also increases the alloy cost during the manufacture of the plate, which fails to bring about essential changes in the cost of non-quenched and tempered steel; The addition of alloying elements will easily cause quality defects such as edge cracks in the plate, and at the same time, the production process of the plate is strictly required, which reduces the qualified rate of plate production. SUMM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/60C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/20C22C38/60
Inventor 秦坤任树洋李行张锦兴刘佳赵庆宇马欣然朱斐斐张杰
Owner TANGSHAN IRON & STEEL GROUP
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