Welded pipes are classified by purpose
The welded pipe industry offers a wide variety of options, each designed for specific purposes. One category includes general welded pipes, which are typically used for transporting low-pressure fluids. These pipes are manufactured using materials like Q195A, Q215A, or Q235A steel, though other mild steels that are easy to weld can also be utilized. They undergo rigorous tests such as water pressure, bending, and flattening, with particular attention paid to their surface quality. Delivery lengths usually range between 4 to 10 meters, though fixed-length orders (or double rules) are often requested. Specifications are denoted by the nominal diameter (either in millimeters or inches). It's important to note that the nominal diameter does not match the actual diameter. Welded pipes come in two varieties based on wall thickness: standard steel pipes and thicker ones. Additionally, they are classified according to whether the ends are threaded or not.
Another type is the galvanized welded pipe, which enhances corrosion resistance by coating regular steel pipes (often referred to as "black pipes"). There are two main methods of galvanization: hot-dip galvanizing, which results in a thicker layer, and electro-galvanizing, which is more cost-effective.
Blown oxygen welded pipes serve as conduits for oxygen and are typically made from small-diameter welded steel pipes ranging from 8/8 inch to 2 inches. They are fabricated from steel strips like 08, 10, 15, 20, or Q195-Q235 steel. For added protection against corrosion, some are aluminized.
Wire casing refers to a common carbon steel electric welded pipe used in concrete and various structural power distribution projects. Nominal diameters typically span from 13 to 76 mm. The casing is relatively thin and is often coated or galvanized. A cold bend test is mandatory for these pipes.
Metric welded pipes follow the seamless pipe form, measured in outer diameter multiplied by wall thickness in millimeters. These pipes are created through either tropical or cold strip welding using ordinary carbon steel, high-quality carbon steel, or plain low-alloy steel. Afterward, they may undergo cold drawing processes. Metric welded pipes are available in general and thin-wall variants. The general variant is often used as structural members, such as transmission shafts, or for conveying fluids. The thin-wall version finds applications in furniture, lighting fixtures, and similar items, ensuring both strength and flexibility.
Roller tubes are employed in belt conveyors and are usually crafted from Q215, Q235A, B steel, or 20 steel, with diameters varying from 63.5 to 219.0 mm. The bending degree must be precise, with the end face perpendicular to the centerline, and ellipticity is a key consideration. Water pressure and flattening tests are standard procedures.
Transformer tubes are specifically designed for manufacturing transformer heat pipes and other heat exchangers. They are made from ordinary carbon steel and require flattening, flaring, bending, and hydraulic testing. These pipes are delivered in fixed lengths or multiples, with specific requirements for the bending of the pipes.
Shaped tubes encompass square, rectangular, hat-shaped, and hollow steel door and window tubes, all welded from ordinary carbon structural steel and 16Mn steel. They are primarily used in agricultural machinery components and steel window frames.
Electric welding thin-walled pipes are predominantly used for creating furniture, toys, and lighting fixtures. Recently, thin-walled stainless steel strips have gained popularity for high-end furniture, decorations, and fencing.
Spiral welded pipes are manufactured by rolling low-carbon carbon structural steel or low-alloy structural steel strips into a helical shape at a specific angle. The pipe joint is then welded to create narrower strips, resulting in large-diameter steel pipes. These pipes are primarily used for oil and natural gas transmission, with specifications expressed as outer diameter multiplied by wall thickness. Spiral welded pipes can be single-sided or double-sided welded, and they must meet standards for hydraulic testing, tensile strength, and cold bending performance of the weld.
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