Divided into the following categories: divided into general welded pipes, galvanized welded pipes, oxygen-blowing welded pipes, wire casings, metric welded pipes, roller pipes, deep well pump pipes, automotive pipes, transformer pipes, electrical Welding 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. It can also be made of other mild steel that is easy to weld. Steel pipe to enter
Experiments such as water pressure, bending, flattening, etc. have certain requirements on the surface quality, usually the delivery length is 4-10m, and the fixed-length (or double-length) delivery is often required. Specification of welded pipe
Nominal diameter (mm or inch) The nominal diameter is different from the actual. Welded pipes are divided into ordinary steel pipes and thickened steel pipes according to the specified wall thickness.
There are two kinds of pattern and without thread.
Galvanized steel pipe: In order to improve the corrosion resistance of the steel pipe, the general steel pipe (black pipe) is galvanized. Galvanized steel pipes are divided into two types: hot-dip galvanizing and electric steel zinc. The hot-dip galvanizing layer is thick, the cost of electro-galvanizing is low.
Oxygen-blowing welded pipe: Used as a steel-making oxygen-blowing pipe, generally small-diameter welded steel pipes, with eight specifications ranging from 3/8 inch to 2 inch. Made of 08, 10, 15, 20 or Q195-Q235 steel belt become. In order to prevent corrosion, some are aluminized.
Wire casing: It is also an ordinary carbon steel electric welded steel pipe, used in concrete and various structural power distribution projects. The commonly used nominal diameter is from 13-76mm. The wall of the wire sleeve is thinner, Most of them are used after coating or galvanizing, requiring cold bending test.
Metric welded pipe: The specification is in the form of seamless pipe, welded steel pipe expressed by outer diameter * wall thickness in millimeters, and hot and cold bands of ordinary carbon steel, high-quality carbon steel or general energy low-alloy steel Welding, or hot-tropical welding and then cold drawing method. Metric welded pipes are divided into general energy and thin-walled, and are commonly used as structural parts, such as transmission shafts, or conveying fluids. Thin-walled pipes are used for production.
For furniture, lamps, etc., steel pipe strength and bending tests must be ensured.
Roller tube: Electric welded steel pipe for the roller of belt conveyor, generally made of Q215, Q235A, B steel and 20 steel, with a diameter of 63.5-219.0mm. Tube curvature, end face
It must be perpendicular to the center line and has certain requirements for ellipticity. Generally, water pressure and flattening tests are carried out.
Transformer tube: It is used to manufacture transformer radiator tubes and other heat exchangers. It is made of ordinary carbon steel and requires flattening, flaring, bending, and hydraulic tests. Steel pipe
Delivered at fixed length or multiple lengths, there are certain requirements for the bending of the steel pipe.
Special-shaped pipes: square pipes, rectangular pipes, hat-shaped pipes, hollow rubber steel doors and windows welded by ordinary carbon structural steel and 16Mn steel strips, mainly used for agricultural machinery parts, steel windows and doors
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Welded thin-walled pipe: mainly used to make furniture, toys, lamps, etc. At present, thin-walled pipes made of stainless steel belts are widely used, such as high-end furniture, decoration, and fences.
Spiral welded pipe: the low-carbon carbon structural steel or low-alloy structural steel strip is rolled into a tube blank at a certain helix angle (called forming angle), and then the pipe seam is welded together.
Therefore, it can produce large-diameter steel pipes with narrower strip steel. Spiral welded pipes are mainly used for oil and natural gas pipelines, and their specifications are expressed by outer diameter * wall thickness. Spiral welding
There are single-sided welding and double-sided welding, the welded pipe should ensure that the hydraulic test, the tensile strength and cold bending performance of the weld meet the requirements.
Post time: Nov-15-2021