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Thin-specification high-strength steel plate with good low-temperature-resistant toughness and production method thereof

A technology for low-temperature-resistant toughness and high-strength steel plates, which is applied in the field of high-strength thin-gauge steel plates and their low-cost production, thin-gauge high-strength steel plates and their manufacturing fields, and can solve problems such as difficulty in process execution and achieve low cost and low production costs. The effect of low and small amount of alloy addition

Inactive Publication Date: 2019-05-07
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two-stage rolling is adopted, the starting temperature of finish rolling is controlled at 940-965°C, the temperature of finish rolling is controlled at 810-830°C, and the number of passes of finish rolling is limited to 6-7. The process execution is difficult

Method used

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  • Thin-specification high-strength steel plate with good low-temperature-resistant toughness and production method thereof
  • Thin-specification high-strength steel plate with good low-temperature-resistant toughness and production method thereof
  • Thin-specification high-strength steel plate with good low-temperature-resistant toughness and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] The chemical composition of present embodiment steel plate is as follows:

[0022] The chemical composition and weight percentage content (%) of the product are: C: 0.12%, Si: 0.29%, Mn: 1.16%, S: 0.004%, P: 0.013%, Nb: 0.016%, Ti: 0.14%, Als: 0.031%, the rest is Fe and trace impurities.

[0023] The preparation method of the above-mentioned steel plate is as follows: including molten iron and treatment, converter smelting, LF refining, slab continuous casting, slab heating, controlled rolling, hot straightening, air cooling, the preparation method of the above-mentioned steel plate is as follows: including molten iron pretreatment, duplex Steelmaking process deep dephosphorization, LF refining, RH vacuum degassing, slab continuous casting, slab heating, controlled rolling and controlled cooling, continuous casting slab size: 200mm×1800mm×2500mm, steel plate size: 8mm×2800mm×37000mm ,in:

[0024] (1) Hot metal pretreatment: after pretreatment, the S content in the hot...

Embodiment 2

[0032] The chemical composition of present embodiment steel plate is as follows:

[0033] The chemical composition and weight percentage content (%) of the product are: C: 0.15%, Si: 0.30%, Mn: 1.28%, S: 0.005%, P: 0.015%, Nb: 0.019%, Ti: 0.15%, Als: 0.034%, the rest is Fe and trace impurities.

[0034] The preparation method of the above-mentioned steel plate is as follows: including molten iron and treatment, converter smelting, LF refining, slab continuous casting, slab heating, controlled rolling, hot straightening, air cooling, the preparation method of the above-mentioned steel plate is as follows: including molten iron pretreatment, duplex Steelmaking process deep dephosphorization, LF refining, RH vacuum degassing, slab continuous casting, slab heating, controlled rolling and controlled cooling, continuous casting slab size: 200mm×1800mm×2700mm, steel plate size: 8mm×2900mm×37600mm ,in:

[0035] (1) Hot metal pretreatment: After pretreatment, the S content in the hot...

Embodiment 3

[0043] The chemical composition of the present embodiment steel plate is as follows:

[0044] The chemical composition and weight percentage content (%) of the product are: C: 0.12%, Si: 0.33%, Mn: 1.21%, S: 0.003%, P: 0.011%, Nb: 0.021%, Ti: 0.17%, Als: 0.029%, the rest is Fe and trace impurities.

[0045] The preparation method of the above-mentioned steel plate is as follows: including molten iron and treatment, converter smelting, LF refining, slab continuous casting, slab heating, controlled rolling, hot straightening, air cooling, the preparation method of the above-mentioned steel plate is as follows: including molten iron pretreatment, duplex Steelmaking process deep dephosphorization, LF refining, RH vacuum degassing, slab continuous casting, slab heating, controlled rolling and controlled cooling, continuous casting slab size: 200mm×1800mm×2500mm, steel plate size: 10mm×2600mm×32000mm ,in:

[0046] (1) Hot metal pretreatment: After pretreatment, the S content in th...

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Abstract

The invention relates to a thin-specification high-strength steel plate with good low-temperature-resistant toughness and a low-cost production method thereof. The steel plate comprises the followingchemical components of, by weight, 0.11%-0.17% of C, 0.20-0.50% of Si, 1.00-1.50% of Mn, less than or equal to 0.010% of S, less than or equal to 0.020% of P, 0.010-0.030% of Nb, 0.010-0.020% of Ti, 0.015-0.050% of Als, and the balance Fe and trace impurities. The preparation method of the steel plate comprises molten iron pretreatment, converter smelting, LF refining, slab continuous casting, slab heating, controlled rolling, hot straightening and air cooling. According to the steel plate and the production method thereof, the yield strength of the obtained steel plate with the thickness of 8-10 mm can reach 380-490 MPa, the tensile strength reaches 510-630 MPa, and the Charpy impact energy of a V-shaped notch under minus 47 DEG C is larger than or equal to 110 J.

Description

technical field [0001] The invention relates to a thin-gauge high-strength steel plate and a manufacturing method thereof, in particular to a high-strength thin-gauge steel plate with excellent low-temperature impact resistance at -47°C and a low-cost production method thereof, belonging to the field of low-alloy steel. Background technique [0002] In recent years, from the perspective of cost control, end users have continuously proposed and upgraded the use requirements for wide and thick plate products in terms of light weight, high strength, low temperature resistance, easy processing, and low cost, especially in terms of low temperature impact toughness. To meet the individual needs of guaranteeing impact energy at -45°C low temperature. According to the low-temperature impact energy test method, when testing the low-temperature impact toughness at -45°C, the temperature setting range is ±2°C. Therefore, the product should actually guarantee the low-temperature impact ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C22C38/14C21D8/02
Inventor 张鹏王腾飞赵新华闫志华
Owner SHANDONG IRON & STEEL CO LTD
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