It is also divided into general welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire casing, metric welded pipe, roller pipe, deep well pump pipe, automotive pipe, transformer pipe, welded thin-walled pipe, welded profiled pipe, scaffolding pipe and spiral welded pipe.
General welded pipe: general welded pipe is used to transport low pressure fluid. Made of Q195A, Q215A, Q235A steel. Can also be easy to weld other soft steel manufacturing. Steel pipe to water pressure, bending, flattening and other experiments, there are certain requirements for surface quality, usually delivery length of 4-10m, often require fixed-foot (or times the foot) delivery. Welded pipe specifications expressed in nominal caliber (millimeters or inches) nominal caliber is different from the actual, welded pipe according to the specified wall thickness of ordinary steel pipe and thickening of two kinds of steel pipe according to the form of the pipe end is divided into two kinds of threaded and unthreaded.
Galvanized steel pipe: in order to improve the corrosion resistance of steel pipe, the general steel pipe (black pipe) is galvanized. Galvanized steel pipe is divided into hot-dip galvanized and electro-galvanized two kinds of hot-dip galvanized galvanized layer is thick, electro-galvanized low cost.
Oxygen blowing welded pipe: used as a steel blowing oxygen pipe, generally with a small diameter welded steel pipe, specifications from 3/8 inch -2 inch eight. Made of 08, 10, 15, 20 or Q195-Q235 steel strip. In order to prevent corrosion, some of the aluminum treatment.
Wire casing: that is, ordinary carbon steel welded steel pipe, used in concrete and a variety of structural power distribution projects, commonly used nominal diameter from 13-76mm. wire casing pipe wall is thin, most of the coating or galvanized for use after the requirement of cold bending test.
Metric welded pipe: specifications used as a seamless pipe form, with an outside diameter * wall thickness in millimeters, said the welded steel pipe, with ordinary carbon steel, high-quality carbon steel or universal low alloy steel hot strip, cold strip welding, or hot strip welded and then made by cold dialing method. Metric welded pipe is divided into universal and thin-walled, ordinary used as structural parts, such as drive shafts, or to transport fluids, thin-walled used to produce furniture, lamps and lanterns, etc., to ensure the strength of the steel pipe and bending test.
Roller tube: used for belt conveyor roller welded steel pipe, generally with Q215, Q235A, B steel and 20 steel manufacturing, diameter 63.5-219.0mm. on the pipe bending, end face to be perpendicular to the center line, ellipticity has certain requirements, generally hydrostatic and flattening test.
Transformer tube: used in the manufacture of transformer heat pipes and other heat exchangers, using ordinary carbon steel manufacturing, requirements for flattening, flaring, bending, hydraulic test. Pipe delivery in fixed or times the size of the pipe, the pipe bending degree has certain requirements.
Shaped tube: square tube, rectangular tube, cap-shaped tube, hollow rubber steel doors and windows with steel pipe welded by ordinary carbon structural steel and 16Mn and other steel strip, mainly used as agricultural machinery components, steel windows and doors.
Welded thin-walled tube: mainly used for making furniture, toys, lamps and lanterns. In recent years, the thin-walled tube made of stainless steel belt is widely used, advanced furniture, decoration, fences and so on.
Spiral welded pipe: is a low carbon carbon structural steel or low alloy structural steel steel strip according to a certain angle of the helix (called the molding angle) rolled into a billet, and then welded the pipe seam made of it, it can be a narrower strip to produce large-diameter steel pipe. Spiral welded pipe is mainly used for oil and natural gas transportation pipeline, its specifications are expressed by the outer diameter * wall thickness. Spiral welded pipe has single-side and double-side welded, welded pipe should ensure that the hydrostatic test, the tensile strength of the weld seam and the cold bending performance should be in accordance with the provisions.
