The steel pipe is a hollow cross-sectional steel product with a length significantly greater than its diameter. It is primarily used for fluid transportation, structural support, mechanical manufacturing, and other scenarios. Classified by cross-sectional shape into circular, square, rectangular, and special-shaped types, it serves as a foundational material in industrial and infrastructure sectors.
Classification by Production Process
●Seamless steel pipe
●Welded steel pipe (abbreviated as weld pipe)
Subclassification of Seamless Steel Pipes (by Production Method)
●Hot-rolled seamless steel pipe
●Cold-drawn steel pipe
●Precision steel pipe
●Hot-expanded steel pipe
●Cold-spun steel pipe
●Extruded steel pipe, etc.
Seamless steel pipes are manufactured from high-quality carbon steel or alloy steel, categorized into hot-rolled and cold-rolled (drawn) types. They are applicable for liquid and gas pipelines across various industries.
Subclassification of Welded Steel Pipes
By Welding Process
●Furnace-welded steel pipe
●Electric resistance welded (ERW) pipe
●Automatic arc-welded steel pipe
By Welding Form
●Straight-seam welded steel pipe(LSAW,ERW)
●Spiral-welded steel pipe ( SSAW)
By End Shape
●Circular welded steel pipe
●Special-shaped (square, flat, etc.) welded steel pipe
Welded steel pipes are formed by welding coiled steel plates with butt seams or spiral seams. By manufacturing method, they are further classified into welded steel pipes for low-pressure fluid service, spiral-seam electric resistance welded (ERW) steel pipes, direct coil-welded steel pipes, electric-welded steel pipes, etc. They are widely used for water supply pipelines, gas pipelines, heating pipelines, electrical conduits, and other applications.
Classification by Material
●Carbon steel pipe
●Alloy steel pipe
●Stainless steel pipe, etc.
1. Carbon Steel Pipe
●Further divided into ordinary carbon steel pipe and high-quality carbon structural steel pipe.
●Applicable standards: API 5CT, API 5L, ASTM A106, ASTM A53, etc.
2. Alloy Steel Pipe
●Further divided into low-alloy steel pipe, alloy structural steel pipe, high-alloy steel pipe, high-strength steel pipe, bearing steel pipe, heat-resistant and acid-resistant stainless steel pipe, precision alloy pipe, high-temperature alloy pipe, etc.
●Applicable standards: ASTM A333, ASTM B167, ASTM SB-622, ASTM A312, EN 10216-5, etc.
Classification by Surface Coating/Plating Characteristics
●Black pipe (uncoated)
●Coated/plated steel pipe
1. Plated Steel Pipe
●Galvanized steel pipe, aluminized steel pipe, chromium-plated steel pipe, aluminum-diffused steel pipe, and steel pipes with other alloy coatings.
2. Coated Steel Pipe
●Externally coated steel pipe, internally coated steel pipe, internally and externally coated steel pipe.
●Common coatings include plastics, epoxy resin, coal tar epoxy resin, and various glass-based anti-corrosion coatings.
3. Galvanized Steel Pipe
●Further divided into KBG galvanized steel conduit, JDG galvanized steel conduit, threaded steel pipe, etc.
Classification by Application
1.Pipes for pipeline systems
2.Pipes for thermal equipment
3.Pipes for the machinery industry
4.Pipes for petroleum geological drilling
5.Pipes for the chemical industry
6.Pipes for structural use
7.Special-purpose pipes, etc.
Core Application Fields
1.Water supply and drainage pipelines, gas pipelines, bridge/building structural support.
2.Industrial production: Fluid transportation and equipment matching in petrochemical, electric power, metallurgy, pharmaceutical, and food processing industries.
3.Energy sector: Long-distance oil and gas transmission pipelines, shale gas exploitation, thermal power/nuclear power boiler pipelines.
4.Machinery and transportation: Automotive components, engineering machinery, shipbuilding/aerospace parts.
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