Spiral submerged-arc welded pipe for oil and gas transmission suitable for low temperatures and manufacturing method thereof

A technology for submerged arc welded pipes and low-temperature environments, which is applied in manufacturing tools, arc welding equipment, welding equipment, etc., can solve the problems that low-temperature toughness cannot meet the service requirements of pipelines, and achieve the effect of improving impact toughness

Active Publication Date: 2013-12-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for pipelines erected in cold regions and exposed spans, their low-temperature toughness, especially the low-temperature toughness of welds and heat-affected zones, still cannot meet the service requirements of pipelines

Method used

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  • Spiral submerged-arc welded pipe for oil and gas transmission suitable for low temperatures and manufacturing method thereof
  • Spiral submerged-arc welded pipe for oil and gas transmission suitable for low temperatures and manufacturing method thereof
  • Spiral submerged-arc welded pipe for oil and gas transmission suitable for low temperatures and manufacturing method thereof

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Embodiment Construction

[0030] The present invention is described in further detail below in conjunction with accompanying drawing:

[0031] see figure 1 , figure 2 , image 3 , Pic 4-1 , Figure 4-2 , Figure 5-1 , Figure 5-2 , Figure 6-1 with Figure 6-2 , the present invention obtains a new type of multi-phase structure design based on bainite (such as figure 1 ), achieving excellent low-temperature toughness and good welding processability of the material, so that the toughness of the base metal can be maintained above 100J at -40°C, and the shear area is greater than 85%; the toughness of the heat-affected zone is above 47J at -40°C. At the same time, the present invention also designs a submerged arc welding wire with excellent low-temperature toughness, which can be used with specific sintered flux to ensure that the toughness of the weld seam reaches above 47J at -40°C, which satisfies the requirements of oil and gas in low-temperature and cold environments above -40°C. Toughness...

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Abstract

The invention discloses a spiral submerged-arc welded pipe for oil and gas transmission suitable for low temperatures and a manufacturing method thereof. A base metal of the steel pipe comprises the following components in percentage by weight: 0.01-0.08% of C, 0.2-0.45% of Si, 0.8-1.8% of Mn, 0.3-1.5% of Ni, 0.1-0.3% of Mo, 0.2-0.5% of Cr, 0.1-0.3% of Cu, 0.005-0.05% of Ti, 0.001-0.005% of N, 0.005-0.05% of Al, less than or equal to 0.015% of P, less than or equal to 0.002% of S, and the balance of Fe and inevitable impurities. The base metal of the steel pipe also comprises 0.0001-0.0050% of B. The spiral submerged-arc welded pipe and manufacturing method thereof disclosed by the invention have the beneficial effects that by using the method disclosed by the invention, the impact toughness of the base metal and welded position of pipeline pipe can be effectively improved without heat treatment; and a spiral submerged-arc welded pipe for oil and gas transmission produced by using the method disclosed by the invention can satisfy the construction needs of oil and gas transmission pipelines at cold areas with a temperature of above minus 40 DEG C.

Description

Technical field: [0001] The invention belongs to the manufacturing industry of oil and gas conveying pipes, and relates to a spiral submerged arc welded pipe with good low-temperature toughness for oil and gas conveying and a manufacturing method thereof. Background technique: [0002] Oil and gas pipeline transportation is the most economical and reasonable transportation method for long-distance transportation of oil and natural gas. In recent years, with the depletion of easy-to-recover oil and gas energy sources, the exploitation of oil and gas resources has gradually extended to deserts, permafrost, oceans, polar regions and other difficult-to-recover areas. Higher and higher. In addition, from the perspective of environmental protection, it is necessary to increase the amount of natural gas extraction. From the perspective of pipeline construction costs, it is necessary to further increase the steel grade and transmission pressure of pipeline pipes to reduce oil and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54C22C38/50B23K9/18B23P15/00
Inventor 毕宗岳牛辉张万鹏刘海璋陈长青赵红波牛爱军黄晓辉张君刘斌包志刚杨军
Owner BC P INC CHINA NAT PETROLEUM CORP
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