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News
Welded pipes are further divided into general welded pipes, galvanized welded pipes, oxygen-blown welded pipes, wire casings, metric welded pipes, idler pipes, deep well pump pipes, pipes for cars, transformer pipes, electric welded thin-walled pipes, electric welded special-shaped pipes and spiral welded pipes.
General welded pipe: General welded pipe is used to transport low pressure fluid. Made of Q195A, Q215A, Q235A steel. Also available in other mild steels that are easy to weld. The steel pipe needs to be tested for water pressure, bending, flattening, etc., and has certain requirements on the surface quality. Usually, the delivery length is 4-10m, and it is often required to deliver to a fixed length (or multiple feet). The nominal diameter of the welded pipe indicates that the nominal diameter (mm or inch) is different from the actual one. The welded pipe can be divided into two types: ordinary steel pipe and thickened steel pipe according to the specified wall thickness.
Galvanized steel pipe: In order to improve the corrosion resistance of steel pipe, general steel pipe (black pipe) is galvanized. Galvanized steel pipe is divided into two types: hot-dip galvanized and electric steel zinc. The hot-dip galvanized galvanized layer is thick and the cost of electro-galvanized is low.
Oxygen-blown welded pipe: used for steel-making oxygen-blown pipes, generally high-quality welded steel pipes, with eight types ranging from 3/8 inch to 2 inch. Made with 08, 10, 15, 20 or Q195-Q235 steel strip. In order to prevent corrosion, some are aluminized.
Wire casing: that is, general carbon steel electric welded steel pipe, used in concrete and various structural power distribution projects, and the commonly used nominal diameter is from 13-76mm. The wall of the wire sleeve is relatively thin, and most of them are used after coating or galvanizing, and a cold bending test is required.
Metric welded pipe: It is standard used as a seamless pipe method, and the welded steel pipe indicated by the outer diameter * wall thickness mm is welded with the hot and cold strips of general carbon steel, high-quality carbon steel or general low-alloy steel, or welded with hot strips. Then it is made by cold-dial method. Metric welded pipes are divided into general and thin-walled pipes. They are generally used as structural parts, such as drive shafts, or to transport fluids. Thin-walled pipes are used to produce furniture, etc., to ensure the strength and bending test of the steel pipe.
Roller tube: It is used for electric-welded steel pipe of belt conveyor idler, generally made of Q215, Q235A, B steel and 20 steel, with a diameter of 63.5-219.0mm. There are certain requirements for the tortuosity of the tube, the end face should be straight with the center line, and the ovality. Generally, water pressure and flattening experiments are carried out.
Transformer tube: used to manufacture transformer radiator tubes and other heat exchangers. It is made of general carbon steel and requires flattening, flaring, bending and hydraulic experiments. The steel pipe is delivered with fixed length or double length, and there are certain requirements for the tortuosity of the steel pipe.
Special-shaped pipe: square pipe, rectangular pipe, hat-shaped pipe, hollow rubber steel door and window steel pipe welded by ordinary carbon structure steel and 16Mn steel strip, mainly used for agricultural machinery parts, steel windows and doors, etc.
Welded thin-walled pipes: mainly used for the manufacture of furniture, toys, etc. In recent years, thin-walled pipes made of stainless steel strips are widely used in furniture, decoration, fences, etc.
Spiral welded pipe: It is to roll low carbon carbon structural steel or low alloy structural steel strip into a tube blank according to a certain helix angle (called forming angle), and then weld the pipe seam together. Strip steel produces large diameter steel pipes. Spiral welded pipe is mainly used for oil and natural gas transportation pipelines, and its standard is indicated by outer diameter * wall thickness. Spiral welded pipe has single-sided welding and double-sided welding. The welded pipe should ensure that the water pressure test, the tensile strength of the weld and the cold bending function must meet the requirements.