Welded pipes are classified by purpose
The welded pipe category includes general welded pipe, galvanized welded pipe, oxygen-blowing welded pipe, electrical conduit, metric welded pipe, idler pipe, deep well pump pipe, automotive pipe, transformer pipe, electric welding thin-wall pipe, shaped pipe, and spiral welded pipe. Each type serves specific purposes and industries.
General welded pipe is primarily used for transporting low-pressure fluids. It's typically made from Q195A, Q215A, or Q235A steel, though other easily weldable mild steels can also be used. These pipes undergo tests like hydrostatic pressure, bending, and flattening, with certain surface quality standards. Delivery lengths usually range from 4 to 10 meters, but fixed-length or double-length orders are often requested. The nominal diameter of the pipe is expressed in millimeters or inches, and the actual inner diameter may differ from the nominal value. Depending on the wall thickness, these pipes are classified as standard or heavy-duty. Additionally, they come in threaded and non-threaded versions.
Galvanized steel pipes enhance corrosion resistance compared to regular black steel pipes. There are two main types of galvanization: hot-dip and electro-galvanizing. Hot-dip galvanizing provides a thicker protective layer, whereas electro-galvanizing is more cost-effective.
Oxygen-blowing welded pipes are specifically designed for oxygen supply systems, commonly using small-diameter welded steel pipes ranging from 8/8 inch to 2 inches. They are typically manufactured from steel grades like 08, 10, 15, or 20, and some are aluminized for extra corrosion protection.
Electrical conduit, also known as wire bushing, is a common carbon steel electric welded pipe used in concrete structures and power distribution systems. Its nominal diameter ranges from 13mm to 76mm. These conduits are usually thin-walled and often coated or galvanized. A cold bend test is mandatory to ensure flexibility and durability.
Metric welded pipes mimic the appearance of seamless pipes but are constructed through welding. These pipes are available in tropical or cold-rolled forms using carbon steel or low-alloy steel. Metric welded pipes are categorized into general and thin-wall types. The former is often used for structural components like transmission shafts, while the latter is ideal for producing furniture, lamps, and other decorative items requiring both strength and aesthetic appeal.
Idler pipes, also known as roller tubes, are electric welded steel pipes used in conveyor belts. Typically made from Q215, Q235A/B, or 20 steel, their diameters range from 63.5mm to 219mm. These pipes must meet stringent quality criteria, including precise bending, perpendicular end faces, and controlled ellipticity. Hydrostatic pressure and flattening tests are standard procedures.
Transformer pipes are specifically manufactured for heat exchangers and similar applications in transformers. Made from ordinary carbon steel, these pipes require flattening, flaring, bending, and hydraulic testing. Fixed-length deliveries with specific bending tolerances are common.
Shaped pipes, such as square, rectangular, hat-shaped, and hollow steel door/window profiles, are fabricated from carbon structural steel or 16Mn steel. They serve as essential components in agriculture, construction, and window manufacturing.
Electric welding thin-wall pipes are predominantly used in furniture, toys, and lighting fixtures. Recently, stainless steel thin-wall pipes have gained popularity in high-end sectors like home decor and fencing due to their durability and elegance.
Spiral welded pipes are produced by rolling steel strips into a helical shape and welding them along the seam. These pipes are ideal for oil and natural gas transportation. Their specifications are defined by outer diameter and wall thickness. Single-sided and double-sided welding methods are employed, with strict adherence to hydraulic testing, tensile strength, and cold bending performance standards.
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