In the steel pipe classification system, galvanized steel pipes, oxygen blown welded pipes, wire sleeves, metric welded pipes, idler pipes, transformer pipes, special-shaped pipes, welded thin-walled pipes, and spiral welded pipes are specialized products with clear purposes and technical requirements. The following will be introduced separately.
Galvanized steel pipe
To improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into two types: hot-dip galvanizing and electroplating galvanizing. Hot dip galvanizing has a thicker galvanized layer and superior corrosion resistance; Electrogalvanizing has a lower cost, but the coating is thinner.
Oxygen blown welded pipe
Oxygen blown welded pipes are used for steelmaking oxygen blowing, generally using small-diameter welded steel pipes with specifications ranging from 3/8 inch to 2 inches, totaling eight types. Made of 08, 10, 15, 20 or Q195-Q235 steel strips. To prevent corrosion, some products will undergo aluminum infiltration treatment.
Conduit
Wire conduit is a common carbon steel welded steel pipe used in concrete and various structural power distribution projects, with a commonly used nominal diameter range of 13-76mm. The wall thickness of wire conduit is relatively thin, and it is mostly used after coating or galvanizing treatment, and requires cold bending test.
Metric welded pipe
The specifications of metric welded pipes are represented by seamless steel pipes, marked with outer diameter x wall thickness (mm). Made by welding hot-rolled or cold-rolled steel strips of ordinary carbon steel, high-quality carbon steel, or ordinary low-alloy steel, or by hot rolling welding and then cold drawing process.
Metric welded pipes are divided into ordinary and thin-walled types: ordinary types are used as structural components (such as transmission shafts) or for conveying fluids; Thin walled products are used for producing furniture, lighting fixtures, and other products. The product must meet the requirements for steel pipe strength and bending test.
Roller tube
Roller tube is an electric welded steel pipe used for belt conveyor rollers, generally made of Q215, Q235A, Q235B steel and No. 20 steel, with a diameter range of 63.5-219.0mm. There are clear requirements for the bending degree, perpendicularity between the end face and the centerline, and ellipticity of the steel pipe, which usually require hydrostatic and flattening tests.
Transformer tube
Transformer tubes are used to manufacture transformer heat dissipation tubes and other heat exchangers, and are made of ordinary carbon steel. Flattening, expansion, bending, hydraulic and other tests are required. Steel pipes are delivered in fixed or multiple sizes, and there are certain requirements for the bending degree of the steel pipes.
Special-shaped tube
Special shaped pipes are made by welding ordinary carbon structural steel and 16Mn steel strips, including square pipes, rectangular pipes, cap pipes, etc. They are mainly used for hollow rubber steel doors and windows, agricultural machinery components, steel windows and doors, etc.
Welding thin-walled tube
Thin walled welded pipes are mainly used to make furniture, toys, lighting fixtures, etc. In recent years, thin-walled tubes made of stainless steel strips have been increasingly widely used in fields such as furniture, decoration, and fencing.
Spiral welded pipe
Spiral welded pipe is made by rolling low-carbon carbon structural steel or low-alloy structural steel strip into a pipe blank at a certain helix angle (forming angle), and then welding the pipe seam. This process can produce large-diameter steel pipes using narrow strip steel.
Spiral welded pipes are mainly used for transportation pipelines of oil and natural gas, with specifications expressed as outer diameter x wall thickness. Spiral welded pipes are divided into single-sided welding and double-sided welding. The product must ensure that the water pressure test is qualified, and the tensile strength and cold bending performance of the weld meet the specified requirements.
Galvanized steel pipe
To improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into two types: hot-dip galvanizing and electroplating galvanizing. Hot dip galvanizing has a thicker galvanized layer and superior corrosion resistance; Electrogalvanizing has a lower cost, but the coating is thinner.
Oxygen blown welded pipe
Oxygen blown welded pipes are used for steelmaking oxygen blowing, generally using small-diameter welded steel pipes with specifications ranging from 3/8 inch to 2 inches, totaling eight types. Made of 08, 10, 15, 20 or Q195-Q235 steel strips. To prevent corrosion, some products will undergo aluminum infiltration treatment.
Conduit
Wire conduit is a common carbon steel welded steel pipe used in concrete and various structural power distribution projects, with a commonly used nominal diameter range of 13-76mm. The wall thickness of wire conduit is relatively thin, and it is mostly used after coating or galvanizing treatment, and requires cold bending test.
Metric welded pipe
The specifications of metric welded pipes are represented by seamless steel pipes, marked with outer diameter x wall thickness (mm). Made by welding hot-rolled or cold-rolled steel strips of ordinary carbon steel, high-quality carbon steel, or ordinary low-alloy steel, or by hot rolling welding and then cold drawing process.
Metric welded pipes are divided into ordinary and thin-walled types: ordinary types are used as structural components (such as transmission shafts) or for conveying fluids; Thin walled products are used for producing furniture, lighting fixtures, and other products. The product must meet the requirements for steel pipe strength and bending test.
Roller tube
Roller tube is an electric welded steel pipe used for belt conveyor rollers, generally made of Q215, Q235A, Q235B steel and No. 20 steel, with a diameter range of 63.5-219.0mm. There are clear requirements for the bending degree, perpendicularity between the end face and the centerline, and ellipticity of the steel pipe, which usually require hydrostatic and flattening tests.
Transformer tube
Transformer tubes are used to manufacture transformer heat dissipation tubes and other heat exchangers, and are made of ordinary carbon steel. Flattening, expansion, bending, hydraulic and other tests are required. Steel pipes are delivered in fixed or multiple sizes, and there are certain requirements for the bending degree of the steel pipes.
Special-shaped tube
Special shaped pipes are made by welding ordinary carbon structural steel and 16Mn steel strips, including square pipes, rectangular pipes, cap pipes, etc. They are mainly used for hollow rubber steel doors and windows, agricultural machinery components, steel windows and doors, etc.
Welding thin-walled tube
Thin walled welded pipes are mainly used to make furniture, toys, lighting fixtures, etc. In recent years, thin-walled tubes made of stainless steel strips have been increasingly widely used in fields such as furniture, decoration, and fencing.
Spiral welded pipe
Spiral welded pipe is made by rolling low-carbon carbon structural steel or low-alloy structural steel strip into a pipe blank at a certain helix angle (forming angle), and then welding the pipe seam. This process can produce large-diameter steel pipes using narrow strip steel.
Spiral welded pipes are mainly used for transportation pipelines of oil and natural gas, with specifications expressed as outer diameter x wall thickness. Spiral welded pipes are divided into single-sided welding and double-sided welding. The product must ensure that the water pressure test is qualified, and the tensile strength and cold bending performance of the weld meet the specified requirements.