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Extra thick quenched and tempered steel plate for ocean platform tooth bar and production method thereof

A technology for offshore platforms and production methods, which is applied in the field of steel, can solve problems such as delivery performance that cannot meet the requirements of marine engineering machinery, poor performance uniformity in the thickness direction, and unstable low-temperature impact energy, so as to achieve excellent internal quality and improve mechanical properties. , consistent overall performance

Inactive Publication Date: 2012-03-28
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the thickness of steel plates for racks of offshore platforms is generally less than 150mm. When the thickness exceeds 150mm, there are many problems such as unstable low-temperature impact energy, poor Z-direction performance, and poor performance uniformity in the thickness direction. Therefore, current offshore platforms with a thickness of 150mm or more The delivery performance of steel plates for racks cannot meet the requirements of marine engineering machinery
In addition, since the existing steel plates for offshore platform racks contain many precious metals, the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]The extra-thick quenched and tempered steel plate for racks of offshore platforms provided in this example is composed of the following components in weight percentage: C: 0.14%, Si: 0.22%, Mn: 1.15%, P: 0.012%, S: 0.002%, Ni: 2.40%, Cr: 0.45%, Mo: 0.55%, Nb: 0.020%, Ti: 0.030%, Al 总 : 0.045%, the balance is Fe and unavoidable impurities. The thickness of this steel plate was 177.8 mm.

[0031] The production method of the extra-thick quenched and tempered steel plate for the rack of the offshore platform in this embodiment includes the following steps:

[0032] (1) Smelting process: The molten steel is first smelted in an electric furnace, and then sent to an LF refining furnace for refining. When the temperature of the molten steel is 1550°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree of the vacuum degassing treatment is 66.6Pa, and the vacuum holding time for 25 minutes, followed by casting at a casting temperature of 1535°C ...

Embodiment 2

[0039] The extra-thick quenched and tempered steel plate for racks of offshore platforms provided in this example is composed of the following components in weight percentage: C: 0.18%, Si: 0.15%, Mn: 1.20%, P: 0.015%, S: 0.005%, Ni: 2.45%, Cr: 0.50%, Mo: 0.57%, Nb: 0.023%, Ti: 0.010%, Al 总 : 0.020%, the balance is Fe and unavoidable impurities. The thickness of this steel plate was 177.8 mm.

[0040] The production method of the extra-thick quenched and tempered steel plate for the rack of the offshore platform in this embodiment includes the following steps:

[0041] (1) Smelting process: The molten steel is smelted in an electric furnace first, and then sent to an LF refining furnace for refining. When the temperature of the molten steel is 1570°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree of the vacuum degassing treatment is 67Pa, and the vacuum holding time is After 20 minutes, casting was carried out at a casting temperature of...

Embodiment 3

[0048] The extra-thick quenched and tempered steel plate for racks of offshore platforms provided in this example is composed of the following components in weight percentage: C: 0.17%, Si: 0.35%, Mn: 0.95%, P: 0.010%, S: 0.002%, Ni: 2.55%, Cr: 0.35%, Mo: 0.60%, Nb: 0.050%, Ti: 0.015%, Al 总 : 0.025%, the balance is Fe and unavoidable impurities. The thickness of this steel plate was 177.8 mm.

[0049] The production method of the extra-thick quenched and tempered steel plate for the rack of the offshore platform in this embodiment includes the following steps:

[0050] (1) Smelting process: The molten steel is smelted in an electric furnace first, and then sent to an LF refining furnace for refining. When the temperature of the molten steel is 1560°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree of the vacuum degassing treatment is 67Pa, and the vacuum holding time is After 25 minutes, casting was carried out at a casting temperature of...

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Abstract

The invention which belongs to the technical field of steel concretely discloses an extra thick quenched and tempered steel plate for an ocean platform tooth bar and a production method thereof. The extra thick quenched and tempered steel plate for the ocean platform tooth bar comprises the following components, by weight, 0.14-0.18% of C, 0.15-0.35% of Si, 0.95-1.30% of Mn, equal to or less than0.015% of P, equal to or less than 0.005% of S, 2.35-2.55% of Ni, 0.35-0.55% of Cr, 0.40-0.60% of Mo, 0.020-0.050% of Nb, 0.010-0.030% of Ti, 0.020-0.045% of total Al, and the balance Fe and inevitable impurities, and the thickness of the steel plate reaches 177.8mm. The extra thick quenched and tempered steel plate for the ocean platform tooth bar, which is prepared through carrying out steps ofsmelting by an electric furnace, steel ingot casting by a die, TMCP rolling, fully enclosed quenching and tempering by a well type heating furnace, and the like, has the advantages of high yield strength, good elongation, excellent Z-directional performance, good low temperature impact toughness, good layered tearing resistance, and low production cost.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to an extra-thick quenched and tempered steel plate for racks of offshore platforms and a production method thereof. Background technique [0002] In recent years, with the continuous strengthening of the development of marine resources at home and abroad, the steel used in marine engineering machinery has developed rapidly. At present, the market demand for steel plates for offshore platforms is also increasing, especially as countries are developing into the field of deep-sea drilling, racks are used to manufacture one of the most important components of deep-sea jack-up offshore platforms. The trend of strength and high toughness is obvious, and because of its special use environment, it also puts forward extremely strict requirements on the lamellar tear resistance of steel plates. At present, the thickness of steel plates for racks of offshore platforms is generally les...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C33/04C21D8/02
Inventor 谢良法叶建军赵文忠张海军刘生张彦召王九清张志军张东方刘印子
Owner WUYANG IRON & STEEL
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