Seamless Steel Pipe
High Strength · Zero Leakage · For Demanding Applications
Overview
Seamless steel pipes are integrally formed from high-quality billets through piercing and hot-rolling/cold-drawing processes — no welds, no stress concentrations. This fundamentally eliminates the cracking and leakage risks of welded pipes, making them the preferred choice for petrochemicals, high-pressure fluid transmission, and mechanical manufacturing.
Key Advantages
Integral Forming — Zero Welds, Zero Leakage
The weld-free design eliminates risks of seam corrosion, cracking, and leakage. Withstands high pressure, high temperature, and cryogenic conditions — ideal for flammable, explosive, or corrosive media transport.
Pure Material, Outstanding Mechanical Properties
Available in Q345, 20#, 45#, 16Mn, alloy grades (40Cr/12Cr1MoV) and more. After heat treatment, tensile strength, yield strength, and impact toughness far exceed industry standards — service life 2–3× that of welded pipes.
Complete Size Range for All Scenarios
OD 10–630mm, wall thickness 2–100mm, lengths 6m/12m or custom cut-to-length. Surface treatments include pickling, phosphating, galvanizing, and blackening — from low-pressure fluid to high-pressure boiler applications.
Precision Tolerances, Excellent Machinability
High-precision cold-rolling/cold-drawing holds ID/OD tolerances within ±0.1mm, uniform wall thickness, clean burr-free surface — ready for direct turning, forging, and heat treatment.
Strict QC, Full Export Certifications
Every batch undergoes eddy current, ultrasonic, hydrostatic, and hardness testing. Compliant with GB/T 8162, ASTM A106, API 5L, DIN 17175, and other international standards.
Specifications
- Material
- 20#, 45#, Q345B, 16Mn, 12Cr1MoV, 40Cr, A106B, API 5L, etc.
- Standards
- GB/T 8162 (structural), GB/T 8163 (fluid), GB/T 5310 (boiler), ASTM A106/A53, API 5L
- OD Range
- 10mm – 630mm (custom available)
- Wall Thickness
- 2mm – 100mm (custom available)
- Length
- 3m / 6m / 9m / 12m (cut-to-length available)
- Surface Treatment
- Black, acid-washed & phosphated, bright cold-drawn, galvanized, blackened, rust-inhibitor oil
- Application Grade
- Low-pressure fluid, high-pressure boiler, mechanical structure, hydraulic, petrochemical, defense
- Certifications
- ISO 9001, CE, SGS, BV, API 5L
Applications
Petrochemical & Energy
- Oilfield tubing and casing
- High-temp/pressure steam lines in refineries
- Natural gas transmission pipelines
- Boiler water-wall and superheater tubes
Machinery & Hydraulics
- Hydraulic cylinders, pneumatic cylinders, piston rods
- Bearing rings, gear shafts, machine tool spindles and other precision parts
High-Pressure Fluid Transmission
- Industrial water supply/drainage, corrosive media transport
- High-pressure fire-fighting lines, refrigeration equipment piping
Engineering & Infrastructure
- Bridge piling, tunnel support, steel structural bracing
- Crane components, construction machinery booms
Automotive & Defense
- Automotive axle housings and drive shafts
- Defense equipment structural parts, hydraulic system lines
Why Choose Us
- 01
Factory Direct: Own hot-rolling/cold-drawing lines — custom material, size, tolerance with no middlemen
- 02
Full Custom Service: Non-standard sizes per drawings; one-stop heat treatment, machining, and anti-corrosion services
- 03
Hassle-Free Export: Complete export documentation (CO, Form E/A, API cert); multi-modal transport supported
- 04
Technical & After-Sales Support: Engineers provide material selection and application advice; third-party inspection welcomed
Need a Quote or Technical Advice?
Our engineering team will respond within 24 hours.