High-strength thick-wall welded steel pipe for deep sea pipeline and production method thereof

A technology for welding steel pipes and manufacturing methods, which is applied in the direction of manufacturing tools, welding equipment, applications, etc., and can solve problems such as increased corrosion and complex corrosion behavior of steel pipes

Inactive Publication Date: 2016-07-06
BAOJI PETROLEUM STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the amount of dissolved oxygen in the deep sea increases, and the corrosion behavior of steel pipes caused by seawater, sea mud and seabed microorganisms b

Method used

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  • High-strength thick-wall welded steel pipe for deep sea pipeline and production method thereof
  • High-strength thick-wall welded steel pipe for deep sea pipeline and production method thereof
  • High-strength thick-wall welded steel pipe for deep sea pipeline and production method thereof

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Embodiment Construction

[0040] Combining the manufacturing examples of X70Φ1016mm×36.5mm and X70Φ762mm×40.5mm thick-walled deep-sea pipeline linear submerged arc welded pipe welding joints, the embodiments of the present invention are as follows:

[0041] 1. Development of high-strength thick-walled welded steel pipe plates with a wall thickness of 36.5mm to 40.5mm for deep-sea pipelines with high plasticity and corrosion resistance. According to mass percentage, containing C: 0.03% ~ 0.07%, Si: 0.10% ~ 0.40%, Mn: 1.20% ~ 1.60%, P≤0.012%, S≤0.0015%, Ni: 0.10% ~ 0.35%, Cr: 0.10 %~0.35%, Cu≤0.35%, Mo: 0.10%~0.35%, Nb: 0.01%~0.06%, V: 0.01%~0.06%, Ti: 0.005%~0.025%, Al: 0.01%~0.06%, N: 0.0020% to 0.0060%, Ca: 0.0005% to 0.0035%, Ti / N: 1.5 to 4.0, the rest is formed by Fe and unavoidable impurities, and the welding crack sensitivity index of the material is Pcm≤0.19. The structure of pipeline steel plate is mainly composed of polygonal ferrite and bainite, such as figure 1 As shown, the bainite fractio...

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Abstract

The invention discloses a high-strength thick-wall welded steel pipe for a deep sea pipeline and a production method thereof. The steel pipe plate contains the following components in percentage by mass: 0.03-0.07% of C, 0.10-0.40% of Si, 1.20-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0015% of S, 0.10-0.35% of Ni, 0.10-0.35% of Cr, less than or equal to 0.35% of Cu, 0.10-0.35% of Mo, 0.01-0.06% of Nb, 0.01-0.06% of V, 0.005-0.025% of Ti, 0.01-0.06% of Al, 0.0020-0.0060% of N, 0.0005-0.0035% of Ca, 1.5-4.0% of Ti/N and the balance of Fe and inevitable impurities. The steel pipe disclosed by the invention has high plasticity and corrosion resistance and can be used for conveying the deep sea oil gas in a complicated working condition of deep sea service.

Description

Technical field: [0001] The invention relates to the technical field of pipeline steel and steel pipe manufacturing for submarine oil and gas transmission pipelines, in particular to a high-strength thick-wall welded steel pipe for deep-sea pipelines and a manufacturing method thereof. Background technique: [0002] The ocean is extremely rich in oil and gas resources, and its oil resources account for about 34% of the world's total oil resources. In recent years, the largest new oil and gas discoveries in the world are mainly located offshore, and the share of offshore oil reserves and production in global oil production is also increasing. With the rapid growth of global oil and gas demand and the increasingly prominent crisis of onshore oil and gas resources, offshore oil and gas resources are of great significance to the entire world oil industry and to the future development of the world economy. [0003] Submarine oil and gas transmission pipeline is an indispensable ...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/02C22C38/04C22C38/08C22C38/06C22C38/12C22C38/14C22C38/16B23K9/20
CPCC22C38/18B23K9/20B23K2101/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 毕宗岳牛爱军牛辉张锦刚黄晓辉赵红波刘海璋张鹏张万鹏刘斌陈长青赵勇包志刚刘刚伟席敏敏
Owner BAOJI PETROLEUM STEEL PIPE
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