Making process of high strength steel straight seam steel tube

Abstract

The invention discloses a making process of a high strength steel straight seam steel tube. The making process comprises the following steps of: (1) beveling single grooves at two longitudinal sides of a high strength steel plate; (2) bending the high strength steel plate into a preforming steel tube with longitudinal seams; (3) adjusting gaps of the longitudinal seams to make a precise-forming steel tube and carrying out spot welding connection on the longitudinal seams of the manufactured precise-forming steel tube every other distance; and (4) carrying out a welding process on the longitudinal seams of the precise-forming steel tube to make a finished product of the steel tube, wherein the welding process comprises the following steps of: a, carrying out back welding on the longitudinal seams by using CO2 gas shield welding; and b, carrying out cover surface welding on the longitudinal seams through the back welding. The making process requires fewer equipment, has simple processing procedure and high quality of the manufactured finished product tube, and can completely satisfy production requirements of a steel tube tower; and manufacturers per se of the steel tube tower can process the straight seam steel tube under the premise of low investment, thereby greatly reducing the production cost of the steel tube tower and improving the economic benefit.

Description

technical field [0001] The invention relates to a steel pipe manufacturing process, in particular to a high-strength steel straight seam steel pipe manufacturing process. Background technique [0002] With the development of the domestic economy, high-voltage transmission facilities and communication facilities are widely promoted, the demand for transmission towers and communication towers is gradually increasing, and the requirements for the quality of the towers are also getting higher and higher. [0003] At present, steel pipe towers and angle steel towers are widely used in transmission lines and communication lines. Among them, the steel pipe tower is a tower body with excellent cross-section performance, beautiful appearance and light weight. Compared with the angle steel tower, it uses less steel and has a smaller wind load shape coefficient. However, since the cost of the steel pipe is higher than that of the angle steel, and the cost of the tower itself accounts ...

AI Technical Summary

Problems solved by technology

Due to the cumbersome processing procedures and numerous processing equipments of straight seam steel pipes, for steel pipe tower manufacturers, the equipment is not complete and the technology is not perfect, resulting in the quality of the steel pipes produced is difficult to meet the requirements. Therefore, the current steel pipe tower manufacturers generally purchase directly Seamless steel pipes, or purchase high-quality straight seam steel pipes from professional manufacturers, and then further carry out the production of steel pipe towers, resulting in high cost of steel pipe towers

Especially for high-strength steel finished pipes above Q420, with a diameter of more than 300mm, due to its large diameter, thick pipe wall, and high strength, processing is difficult, the processing period is long, and the processing cost is high, which in turn leads to long procurement cycles and high prices. High, and the production cycle of the steel pipe tower is often delayed due to incomplete specifications

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