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Method of using hot tandem rolling broad strip mill to produce steel plate for ship hull structure use

A technology of steel rolling mill and hot continuous rolling, which is applied in the field of producing high-quality thin-gauge steel plates for ship hull structures, can solve the problems of reduced production capacity, difficulty in producing ship plates with a thickness of about 4-10 mm, and difficulty in ensuring the shape of the ship, and achieves low production cost, Good internal quality and plate shape quality, small welding deformation effect

Active Publication Date: 2010-10-27
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it is difficult for medium and heavy plate rolling mills to produce ship plates with a thickness of about 4-10mm. The production capacity of ship plates with a thickness of about 4-10mm will be greatly reduced, so the general medium and heavy plate factories restrict the production of ship plates of this specification

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  • Method of using hot tandem rolling broad strip mill to produce steel plate for ship hull structure use
  • Method of using hot tandem rolling broad strip mill to produce steel plate for ship hull structure use

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Embodiment 1

[0019] The invention discloses a method for producing steel plates for ship hull structures by using a hot continuous rolling wide strip mill. The molten iron is subjected to desulfurization treatment, converter steelmaking, and refining treatment before continuous casting; the slab smelting composition: C is 0.13wt%, Si is 0.21wt%, Mn is 0.98wt%, P is 0.014wt%, S 0.011wt% and Als 0.04wt%.

[0020] Heating the slab to 1180°C for 3.2 hours; after rough rolling, finishing rolling and laminar cooling, curling is carried out;

[0021] After uncoiling, rough straightening, edge trimming, and fine straightening, the steel coils are cut to length and cross-cut to obtain D-grade steel plates for hull structures. The yield strength is 315MPa, the tensile strength is 440MPa and the elongation is 32%, the thickness is 5.95mm, the width is 2004mm, the length is 8005mm, the out-of-squareness is 1.5mm, the unevenness is 1.5mm, and the camber is 1.5mm

Embodiment 2

[0023] The invention discloses a method for producing steel plates for ship hull structures by using a hot continuous rolling wide strip mill. The molten iron is subjected to desulfurization treatment, converter steelmaking, and refining treatment before continuous casting; the slab smelting composition: C is 0.12wt%, Si is 0.24wt%, Mn is 1.36wt%, P is 0.01wt%, S 0.01wt% and Als 0.033wt%.

[0024] Heating the slab to 1210°C for 3.2 hours; after rough rolling, finishing rolling and laminar cooling, curling is carried out;

[0025] After uncoiling, rough straightening, edge trimming, and fine straightening, the steel coils are cut to length and cross-cut to obtain DH32 grade steel plates for hull structures. The yield strength is 365MPa, the tensile strength is 505MPa, and the elongation is 30%. The thickness is 18.01.98mm, the width is 2002mm, the length is 8005mm, the out-of-squareness is 1.2mm, the unevenness is 1.5mm, and the camber is 1.3mm.

Embodiment 3

[0027] The invention discloses a method for producing steel plates for ship hull structures by using a hot continuous rolling wide strip mill. The molten iron is subjected to desulfurization treatment, converter steelmaking, and refining treatment, and then continuous casting; the slab smelting composition: C is 0.12wt%, Si is 0.25wt%, Mn is 1.4wt%, P is 0.01wt%, S 0.009 wt%, Als 0.032 wt%, and Nb 0.03 wt%.

[0028] Heating the slab to 1200°C for 3.4 hours; after rough rolling, finishing rolling and laminar cooling, curling is carried out;

[0029] After uncoiling, rough straightening, edge trimming, and fine straightening, the steel coils are cut to length and cross-cut to obtain DH36 grade steel plates for hull structures. The yield strength is 440MPa, the tensile strength is 550MPa, and the elongation is 28%. The thickness is 17.98mm, the width is 2003mm, the length is 8004mm, the out-of-squareness is 1.0mm, the unevenness is 1.5mm, and the camber is 1.0mm.

[0030] Examp...

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Abstract

A method of using hot tandem rolling broad strip mill to produce steel plate for ship hull structure use, belonging to steel rolling technology field. Using 2250 mm hot tandem rolling broad strip milland kaiping straightening process to produce steel plates of 1500-2100 mm width and 3-20 mm thickness for ship hull structure use to instead of products of heavy and medium plate mill in the same standard. Molten iron is continuous casted after desulfuration processing, converter steel-making and refining processing; slab is curled after reheating, rough milling, fine rolling and laminar cooling;coil of strip is cut in length after decoiling, rough straightening, trimming cut and fine straightening, at last steel plates for ship hull structure use is obtained which satisfies production need.Applying large straightening force to optimize straightening process of the coil of strip, which improves distribution of residual stress in the straightening ship board greatly and provides little transformation to the kaiping ship board after cutting baiting and provides little transformation to welding between the ship boards of different thickness, which satisfies the request of on site baiting to the flatness and is suitable for shipbuilding request.

Description

technical field [0001] The invention relates to the technical field of steel rolling, and in particular provides a method for producing steel plates for hull structures using a hot continuous rolling wide strip rolling mill, which is a technology for producing high-quality thin steel plates for hull structures instead of medium and thick plates of the specifications. Background technique [0002] In recent years, with the rapid development of the shipbuilding industry, the demand for steel for hull structures is also increasing, resulting in a strong momentum in the domestic demand for ship plates. In order to meet the needs of ship plate production, domestic rolling mills with a width of more than 4000mm are gradually increasing. At present, there are rolling mills of Baosteel, Anshan Iron and Steel, Puyang Iron and Steel, Wuyang, Shouqin, and Shagang. Steel 4800mm, Baosteel compass 4200mm and Baotou Steel 4100, etc., a total of more than ten sets of wide and thick plate ro...

Claims

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Application Information

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IPC IPC(8): B21C37/02B21B1/26C21D9/70C21D11/00B21D1/02C21C1/02C21C5/28C21C7/10C21C7/072C22C38/12C22C38/06
Inventor 阳代军金永春刘建辉孙茂林朱立新魏健全李飞李永林
Owner SHOUGANG CORPORATION