Manufacturing method of q245r straight seam submerged arc welding natural gas vent pipe

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...

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