Spiral steel pipe forming internal stress relations

Spiral steel pipe forming with the internal stress relations

 

Introduction: spiral steel pipe because of its manufacturing processes mature, low cost, fluid pipes using a steel pipe. Currently widely used continuous molding,

spiral pipe

the manufacture of spiral steel pipe submerged arc welding. The molding method within the deck and outside hold two kinds. These two molding methods are generally less than the amount of molding, after a lot of internal stress in the steel pipe manufacturing, reducing the ability of the pressure of the steel pipe. The relationship between the reasons for these two molding methods produce internal stress, internal stress and forming parameters, and improved molding method, measures to reduce internal stress. Theoretical analysis given the formula of the internal stress of the steel pipe less than the amount of molding, and the internal stress of the deck forming the actual measurement of spiral steel pipe, verify that the internal stress of the correctness of the formula given in the spiral steel pipe production and application of guiding significance

Author: Liaoning University of Petroleum & Chemical Technology, Liaoning Shihua University, Liaoning Shihua University Liaoning University of Petroleum University of Chemical Technology

Key words: spiral steel pipe forming the internal stress

 [Text]:

Introduction spiral submerged arc welding steel pipe to the drainage works and other fields in the petrochemical industry, heat pipe network and city has a wide application, more commonly used, especially in long distance transportation of oil and natural gas pipelines. Oil and gas field pipeline network, almost all of spiral welded steel pipe, with a high level of security, durability, and economic rationality. The diameter of the spiral welded steel pipe is generally not subject to the limitations of the sheet width can be more than