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Q245R longitudinal submerged arc welded natural gas blow-down pipe manufacturing method

A technology of straight seam submerged arc welding and manufacturing methods, applied in the direction of manufacturing tools, arc welding equipment, welding equipment, etc.

Active Publication Date: 2013-03-06
BC P INC CHINA NAT PETROLEUM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the venting pipe of natural gas processing plants needs to be placed on the outdoor ground for venting and burning of natural gas. Since most of the natural gas processing plants are located in the northwest region, the outdoor temperature is mostly around minus 20 degrees. At present, there is no one on the market that can meet the low temperature conditions. Natural gas is used to deal with vented and burned longitudinal submerged arc welded pipes, so the manufacture of this kind of longitudinal submerged arc welded natural gas vented pipes has become the focus of research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0019] The Q245R normalizing state steel plate with the chemical composition mass percentage conforming to the GB713-2008 standard and the microstructure is PF+B is used to manufacture the longitudinal submerged arc welded pipe. The manufacturing process is as follows:

[0020] Ultrasonic steel plate automatic flaw detection: use automatic steel plate ultrasonic flaw detection equipment to inspect the steel plate within 50mm of both sides of the plate and the middle part.

[0021] Edge milling: The upper and lower groove angles of the steel plate are both 45°, and the height of the blunt edge is 4.8mm.

[0022] Pre-bending: According to the curvature requirements of the steel pipe and the pipe diameter size requirements, use the pre-bending machine to bend the edge of the plate to the required curvature.

[0023] JCO forming: use a steel pipe with a diameter of 711mm and a wall thickness of 10mm. The main steps are as follows: First, use the JCO forming machine to stamp half o...

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Abstract

The invention discloses a Q245R longitudinal submerged arc welded natural gas blow-down pipe manufacturing method, which mainly comprises the processes of edge milling, JCO formation, inside welding, outside welding, mechanical expanding and post-weld heat treatment. The angles of an upper groove and a lower groove in the edge milling process are 45 degrees and the height of a root face is 4.8mm. The Q245R longitudinal submerged arc welded natural gas blow-down pipe manufacturing method has the beneficial effects that the goals of processing the grooves in the edge milling process is toare of guaranteeing complete joint penetration during welding, to forming proper weld appearance, to preventing defects such as incomplete joint penetration from occurring during high-speed welding, to guaranteeing the quality of welded joints and to realizeing good quality and high yield; and by improving the processes of JCO formation, inside welding, outside welding, mechanical expanding and post-weld heat treatment, the overall performance of produced steel pipes is enabled to be good and satisfy the GB150 standard is met.

Description

technical field [0001] The invention relates to the technical field of natural gas equipment. Background technique [0002] As an important energy source, oil and natural gas account for an increasing proportion of my country's energy structure, and people's daily production and life demand for natural gas is very strong. Using long-distance pipelines to transport oil and gas from production sites to destinations is a safe and efficient transportation method, and has become the main way of onshore oil and gas transportation. With the development of my country's economy, the demand for oil and gas continues to rise. It is estimated that in the next five to ten years, my country's natural gas pipeline network construction will usher in a new round of peaks. [0003] As an important part of the construction of the natural gas pipeline network, the natural gas processing plant is a key construction project. In the production process of natural gas treatment plants, the tail ga...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K9/18
Inventor 张志明苏志钱勇王习彬葛玉宏熊伟杨艳滨马立立周瑞龚健刘志华苏景富徐树凯李雅可张亚莉
Owner BC P INC CHINA NAT PETROLEUM CORP
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