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Submarine pipeline steel plate with great wall thickness and production method of submarine pipeline steel plate

A submarine pipeline and production method technology, applied in the field of low-carbon micro-alloy steel, can solve the problems of high and low temperature toughness requirements, low pass rate of pipeline steel performance indicators, hidden dangers of pipeline laying engineering and operation safety, and high price, so as to enhance market competitiveness , excellent overall performance, and low content of precious alloys

Inactive Publication Date: 2012-09-19
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the submarine pipeline steel used in China is imported, and the price is relatively high.
Domestic production of this kind of high transverse and longitudinal strength performance, high and low temperature toughness requirements, and large thickness pipeline steel performance index pass rate is very low, which has brought great economic losses to the manufacturers, and also brought great harm to the pipeline laying project and operation safety. Huge hidden danger

Method used

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  • Submarine pipeline steel plate with great wall thickness and production method of submarine pipeline steel plate
  • Submarine pipeline steel plate with great wall thickness and production method of submarine pipeline steel plate
  • Submarine pipeline steel plate with great wall thickness and production method of submarine pipeline steel plate

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Embodiment 1

[0037] The thick-walled submarine pipeline steel plate in this embodiment has a thickness of 30.2 mm and is composed of the following components by weight percentage: C: 0.07%, Si: 0.18%, Mn: 1.47%, P: 0.009%, S: 0.001% , Al: 0.04%, Nb: 0.045%, Ni: 0.15%, Ti: 0.017%, Mo: 0.15%, and the balance is Fe and unavoidable impurities.

[0038] The steps of the production method of the thick-walled submarine pipeline steel plate of the present embodiment are as follows:

[0039] (1) Smelting: will contain the following weight percentages C: 0.07%, Si: 0.18%, Mn: 1.47%, P: 0.009%, S: 0.001%, Al: 0.04%, Nb: 0.045%, Ni: 0.15%, Ti: 0.017%, Mo: 0.15% 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 reaches or exceeds 1566°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree is 66Pa. Vacuum holding time is 25min, adding CaSi blocks before vacuum treatment to ...

Embodiment 2

[0045] The large-wall-thick submarine pipeline steel plate in this embodiment has a thickness of 25 mm and is composed of the following components by weight percentage: C: 0.06%, Si: 0.20%, Mn: 1.47%, P: 0.010%, S: 0.001%, Al: 0.035%, Nb: 0.043%, Ni: 0.13%, Ti: 0.015%, Mo: 0.15%, and the balance is Fe and unavoidable impurities.

[0046] The steps of the production method of the thick-walled submarine pipeline steel plate of the present embodiment are as follows:

[0047] (1) Smelting: will contain the following weight percentages C: 0.06%, Si: 0.20%, Mn: 1.47%, P: 0.010%, S: 0.001%, Al: 0.035%, Nb: 0.043%, Ni: 0.13%, Ti: 0.015%, Mo: 0.15% 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 reaches or exceeds 1566°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree is 66Pa. The vacuum holding time is 20min, and CaSi block is added before vacuum t...

Embodiment 3

[0053] The thick-walled submarine pipeline steel plate in this embodiment has a thickness of 30.2mm and is composed of the following components by weight percentage: C: 0.06%, Si: 0.21%, Mn: 1.44%, P: 0.009%, S: 0.001% , Al: 0.033%, Nb: 0.047%, Ni: 0.16%, Ti: 0.016%, Mo: 0.14%, and the balance is Fe and unavoidable impurities.

[0054] The steps of the production method of the thick-walled submarine pipeline steel plate of the present embodiment are as follows:

[0055] (1) Smelting: will contain the following weight percentages C: 0.06%, Si: 0.21%, Mn: 1.44%, P: 0.009%, S: 0.001%, Al: 0.033%, Nb: 0.047%, Ni: 0.16%, Ti: 0.016%, Mo: 0.14% 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 reaches or exceeds 1566°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree is 66Pa. The vacuum holding time is 23min. CaSi blocks are added before vacuum treat...

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Abstract

The invention discloses a submarine pipeline steel plate with a great wall thickness and also relates to a production method for the submarine pipeline steel plate. The submarine pipeline steel plate with the great wall thickness comprises the following components in percentage by weight: 0.05-0.07 percent of C, 0.15-0.25 percent of Si, 1.42-1.48 percent of Mn, not more than 0.010 percent of P, not more than 0.002 percent of S, 0.13-0.18 percent of Ni, 0.043-0.048 percent of Nb, 0.020-0.040 percent of Al, 0.014-0.024 percent of Ti, 0.13-0.18 percent of Mo and the balance of Fe and inevitable impurities. The production method for the steel plate comprises the steps of smelting, ladle refining furnace (LF) / vacuum degassing (VD) refining, continuous casting, heating, rolling, water cooling after rolling and obtaining of a finished product. The submarine pipeline steel plate with the great wall thickness, which is disclosed by the invention, has the thickness of 25-30.3 mm and has the advantages of high low-temperature impact toughness, favorable wear resisting performance, high strength, proper yielding-to-tensile ratio and favorable elongation percentage. The submarine pipeline steel plate with the great wall thickness can be widely applied to submarine pipeline construction and has a broad application prospect.

Description

technical field [0001] The invention belongs to the field of low-carbon micro-alloy steel, and in particular relates to a large-wall-thick seabed pipeline steel plate and a production method thereof, which are suitable for seabed pipeline projects with high requirements for transverse and longitudinal tensile strength and low-temperature toughness. Background technique [0002] In recent years, the rapid development of my country's economy has brought about a rapid increase in the demand for oil and natural gas as the main energy source. The huge oil and natural gas energy gap can only be imported from abroad or found new resources within the territory and improved oil extraction technology. Therefore, A large number of high value-added, high-grade pipelines for oil and gas transmission are required. This has greatly promoted the development of marginal and offshore oil and gas resources and the construction of submarine pipelines, and the importance of steel for submarine pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 韦明刘生张志军赵文忠叶建军张海军王九清张彥召刘印子张东方
Owner WUYANG IRON & STEEL