WeldingSteel PipeAlso known as welding pipe, it is made ofSteel plateOrSteel CoilsAfter coiling and forming, the welded steel pipes are generally cut to 6 meters in length.Welded Steel PipeSimple production process, high production efficiency, diverse varieties and specifications, low equipment investment, but generally lower strength thanSeamless steel pipe
Categorized by application
General Welded Pipe, Galvanized Welded Pipe, Oxygen Welded Pipe, Wire Conduit, Metric Welded Pipe, Roller Tube, Deep Well Pump Pipe, Automotive Pipe, Transformer Pipe, Welded Thin-Wall Pipe, Welded Non-standard Pipe, Scaffold Pipe, and Spiral Welded Pipe.
General Welded Pipe: Generally used for conveying low-pressure fluids. Made from steel grades Q195A, Q215A, and Q235A. Other easily weldable soft steels can also be used. The pipes must undergo hydrostatic, bending, and flattening tests, with specific surface quality requirements. Standard delivery lengths are typically 4-10 meters, with custom lengths (or multiples thereof) often requested. Welded pipe specifications are indicated by nominal diameter (in millimeters or inches). The nominal diameter differs from the actual diameter, with two types of pipes available: standard wall thickness and thickened wall thickness. Pipes are also categorized by the end type, with threaded and unthreaded options.
Galvanized Steel Pipe: To enhance the corrosion resistance of steel pipes, galvanizing is applied to the general steel pipes (black pipes). Galvanized steel pipes are categorized into hot-dipped and electro-galvanized types, with hot-dipped having thicker galvanizing layers and electro-galvanized being more cost-effective.
Oxygen Blowing Pipe: Used for steelmaking oxygen blowing, typically made of small-diameter welded steel pipes, available in eight sizes ranging from 3/8 inch to 2 inches. Made from steel strips of grades 08, 10, 15, 20, or Q195-Q235. Some are treated with aluminum diffusion to prevent corrosion.
Cable Conduit: Also known as ordinary carbon steel welded钢管, used in concrete and various structural power distribution projects, commonly used nominal diameters range from 13-76mm. The conduit wall is thinner, usually coated or galvanized before use, and requires cold bending tests.
Metric Welded Pipes: Seamless pipes in specification, welded steel pipes indicated by outer diameter * wall thickness in millimeters, hot-rolled or cold-rolled焊接 using plain carbon steel, carbon steel, or general low-alloy steel, or made by hot-rolling followed by cold drawing. Metric welded pipes are categorized into general and thin-walled types, commonly used as structural components like drive shafts, or for conveying fluids; thin-walled pipes are used in furniture, lighting fixtures, etc., ensuring pipe strength and bend tests.
Roller Tube: Welded steel tubes for belt conveyors, commonly made of Q215, Q235A, B steel, and 20 steel, with diameters ranging from 63.5 to 219.0mm. The tubes must meet certain requirements for bend, end face perpendicular to the centerline, and ellipticity. Generally, hydrostatic and flattening tests are conducted.
Transformer Tube: Used for manufacturing transformer cooling tubes and other heat exchangers, made of plain carbon steel, requiring processes such as flattening, expanding, bending, and hydrostatic testing. Steel pipes are delivered in fixed or multiple lengths, with specific requirements for the degree of bend.
