Production technology of straight seam steel pipe
Straight-seam steel pipes can be further subdivided into various types according to different production processes and uses, including but not limited to:
High-frequency straight-seam steel pipe: usually called original steel pipe, long strip steel strip is rolled into a round tube on high-frequency welding unit and welded by straight seam.
Submerged arc welding straight seam steel pipe: JCOE cold forming process is adopted, welding wire is used for welding seam, and particle flux is used for submerged arc at the same time, hence the name.
Wire sleeve: the pipe wall is thin, and most of them are used after coating or galvanizing, and cold bending test is required.
Roller tube: welded steel tube used for roller of belt conveyor, which has requirements on tube curvature, verticality and ellipticity between end face and center line.
Transformer tubes: used to manufacture transformer radiator tubes and other heat exchangers, which need flattening, flaring, bending and hydraulic test.
Special-shaped pipes: including square pipes, rectangular pipes, hat-shaped pipes, etc., are welded by ordinary carbon structural steel and 16Mn steel belts, and are mainly used as agricultural machinery components, steel windows and doors, etc.
The production technology of straight seam steel pipe mainly includes the following steps:
Pre-bending edge: Pre-bending the edge of the plate by using a pre-bending machine to make the edge of the plate have the required curvature.
Forming: press the pre-bent steel plate into an open "O" shape on the forming machine.
Welding: including pre-welding, internal welding and external welding, and continuous welding is carried out by gas shielded welding or submerged arc welding.
Inspection: The quality of welds and steel pipes is inspected by ultrasonic inspection, X-ray inspection and water pressure test.
Anticorrosion and coating: The qualified steel pipes shall be subjected to anticorrosion and coating treatment according to the requirements of users.
application area
Straight-seam steel pipe is favored by the market because of its low cost, high production efficiency and wide application range. It is mainly used for conveying low-pressure fluid, making furniture, lamps, toys and other thin-walled tube products, and as the idler tube of belt conveyor and the radiator tube of transformer. In addition, straight-seam steel pipes can also be used as structural parts and supports in the fields of buildings, bridges, ships and so on.
To sum up, straight welded steel pipe is an important type of welded steel pipe, which has a unique production process and a wide range of applications.
