Carbon Steel Pipe Fittings

Carbon Steel Pipe Fittings specifications are primarily identified by outer diameter (Φ) × wall thickness (mm), covering a wide range of applications, mainly small and medium diameters.

They are categorized into standard and custom specifications based on usage:

Outer Diameter Range: Φ18mm, Φ25mm, Φ32mm, Φ42mm, Φ48mm, Φ57mm, Φ60mm, Φ76mm, Φ89mm, Φ108mm, Φ133mm, Φ159mm, Φ219mm, Φ273mm, Φ325mm, Φ426mm (standard maximum Φ426mm, extra-large diameters can be customized up to Φ630mm)

Wall Thickness Range: 2.5mm～12mm (standard), thinner pipes down to 2.0mm, thicker pipes customized up to 20mm, wall thickness tolerance ±0.1mm～±0.3mm

Fixed Length: 6m and 12m are standard lengths, custom lengths such as 9m and 15m are available, supporting whole rolls/rolls. Single-piece cutting

Carbon Steel Pipe Fittings processing must adhere to multi-dimensional standards, covering the entire process of material, size, performance, and testing.

Core standards are divided into domestic and international categories:

Product Types

Manufacturers can provide a full range of seamless carbon steel pipes based on four dimensions: material, process, application, and special treatment, meeting the needs of domestic and overseas projects:

By Material Classification

High-Quality Carbon Steel: 10#, 20# (Core mainstream, suitable for fluid transportation, clean water, and low-pressure steam)

Ordinary Carbon Structural Steel: Q195, Q215, Q235B/C/D (Suitable for structural use, low-temperature environments, and general water supply and drainage)

Low-Alloy High-Strength Steel: Q355B, Q355C, Q420 (Suitable for high-pressure conditions, heavy structures, and engineering machinery)

Overseas Specialized Materials: ASTM A53 Gr.B, API 5L Gr.B/X42, EN 10302 S235JR (Suitable for overseas municipal and oil and gas projects)

Classification by Production Process

Hot-rolled seamless tube: High forming efficiency, uniform wall thickness, suitable for conventional structures and large-diameter pipelines

Cold-drawn/Cold-rolled seamless tube: High dimensional accuracy, smooth surface, suitable for precision fittings, automotive oil lines, and household appliance components

Classification by Application

Fluid Transport Pipe: GB/T 8163 20#/Q235B, suitable for water, gas, and compressed air

Structural Pipe: GB/T 8162 Q235B/Q355B, suitable for building supports, machinery frames, and piling

High-Pressure Special Pipe: Q355B/Low Alloy, suitable for power plant boilers, hydraulic systems, and high-pressure oil and gas

Special Processing Types

Precision Seamless Tube: Outer diameter tolerance ±0.05mm, surface Ra≤0.8μm, suitable for precision equipment and instrument tubes

Corrosion-resistant Seamless Tube: 3PE/FBE Anti-corrosion coating, suitable for coastal, high-humidity, and chemically corrosive environments.

Seamless insulated pipe: Polyurethane insulation layer, suitable for thermal steam pipelines.

Custom-shaped seamless pipe: Square, oval, and other custom cross-sections to meet special structural requirements.