Steel pipe classification and application field detailed explanation

As an important industrial material, steel pipe is widely used in construction, energy, machinery manufacturing and other fields.

First, steel pipe classification
1. Classification by production method
● Seamless steel pipe: made by hot rolling, cold drawing or extrusion process, smooth surface, high strength, suitable for high-pressure fluid transport (such as boiler tube, oil well tube).
● Welded Steel Pipe: made of steel coil welding, divided into straight seam welded pipe (ERW) and spiral welded pipe (SSAW), low cost, mostly used for low pressure fluid transport (such as water pipes, gas pipes).

2. Sort by material
● Carbon Steel Pipe: ordinary carbon steel (Q235) and high-quality carbon steel (20#, 45#), low cost, widely used in building structures.
● Alloy steel pipe: containing chromium, nickel and other alloy elements (such as 15CrMo, 12Cr1MoV), high temperature and high pressure resistance, used in petrochemical equipment.
● Stainless steel pipe: 304, 316 and other models, strong corrosion resistance, suitable for medical equipment, food processing.

3. Classification by section shape
● Round steel pipe: the most common type, used for general fluid transfer and structural support.
● Shaped steel pipe: including square pipe, rectangular pipe, hexagonal pipe, etc., for special scenes (such as furniture frame, bridge reinforcement).
● Variable section steel pipe: such as corrugated pipe, conical pipe, used for shock absorption or special mechanical parts.

Second, Main application areas

1. Construction industry
● Structural support: scaffolding, bridge truss (square tube/rectangular tube).
● Decorative materials: handrail, ceiling keel (galvanized steel pipe).

2. Energy and Chemicals
● Oil and gas transmission: X70/X80 high steel spiral welded pipe (long distance transmission).

● Chemical equipment: stainless Steel Tubes are used in reactors and heat exchangers.

3. Mechanical manufacturing
● Parts: bearing, hydraulic cylinder (seamless steel pipe).
● Automotive industry: exhaust pipe, chassis structure (high-temperature alloy tube).

4. Transportation
● Rail transit: rail, car connector (high strength steel pipe).
● Shipbuilding: seawater desalination pipeline (seawater corrosion resistant steel pipe).