Seamless Pipe
Size: 1/2''-24'' (DN15-DN600)
Standards: ASTM A106 / ASTM A53 / API 5L / EN10216 / GB/T8163
Material Grades: Gr.B / X42 / X52 / Q235 / Q355
Manufacturing Process: Hot Rolled / Cold Drawn
Wall Thickness: SCH20 / SCH40 / SCH80 / SCH160
Product Overview
High-Quality Seamless Steel Pipes for Fire Protection, Oil & Gas, Water and Industrial Applications
KOXY is a professional seamless steel pipe manufacturer and global supplier with over 30 years of experience in industrial piping systems. We supply carbon steel seamless pipes for fire protection, oil & gas transmission, HVAC systems, water pipelines, construction, and industrial processing projects worldwide.
Our seamless pipes are manufactured to international standards including ASTM, API, GB, and EN specifications, ensuring stable pressure resistance, high mechanical strength, and long-term reliability in demanding environments.
With large inventory, strict quality control, and fast international delivery, KOXY supports distributors, EPC contractors, wholesalers, and project buyers with one-stop pipeline solutions.
Why Choose Our Seamless Steel Pipes
High Pressure Resistance
Designed for high-pressure and high-temperature industrial pipeline systems.
Multiple International Standards
Available in ASTM, API, EN, and GB standards for global project requirements.
Wide Industrial Applications
Suitable for fire protection, oil & gas, HVAC, water supply, and industrial processing systems.
OEM & Custom Manufacturing
Custom sizes, wall thicknesses, coatings, and packaging solutions available.
What Is a Seamless Steel Pipe?
A seamless steel pipe is a steel tube manufactured without a welded seam. Compared with welded pipes, seamless pipes provide higher mechanical strength, better pressure resistance, and improved reliability under high-pressure or high-temperature conditions.
Because there is no welding line, seamless steel pipes are widely used in safety-critical and industrial applications such as:
Fire protection systems
Oil & gas pipelines
Industrial fluid transportation
Boiler systems
HVAC systems
Power plants
Municipal water supply
Seamless pipes are ideal for projects requiring stable performance and long service life.
Seamless Steel Pipe Specifications
| Item | Details |
|---|---|
| Surface Treatment | Black / Galvanized / Anti-corrosion Coated |
| End Types | Plain End / Beveled End / Threaded |
| Thread Standards | NPT / BSPT / BSPP |
| Length | 6m / 12m / Custom |
| Applications | Fire Protection / Oil & Gas / Water Supply / HVAC / Industrial Systems |
Advantages of Seamless Steel Pipes
Excellent Pressure Resistance
Seamless steel pipes can withstand higher internal pressure, making them suitable for industrial pressure systems and pipeline transportation.
Strong Structural Integrity
Without welded joints, the pipe body maintains consistent strength and reduces the risk of leakage or structural failure.
Long Service Life
Carbon steel seamless pipes perform reliably in high-temperature, high-pressure, and heavy-duty operating environments.
Flexible Project Compatibility
Available in multiple sizes, standards, schedules, and surface treatments for various industrial applications.
Technical Specifications
| Size | Thickness | Outer Diameter | Size | Thickness | Outer Diameter |
| DN15 | 2.50 | 22 | DN100 | 4.00 | 108 |
| 3.00 | 22 | 4.50 | 108 | ||
| 4.00 | 22 | 6.00 | 108 | ||
| DN20 | 3.00 | 27 | DN100 | 4.50 | 114 |
| 3.50 | 27 | 5.00 | 114 | ||
| 4.00 | 27 | 6.00 | 114 | ||
| DN25 | 3.00 | 34 | DN125 | 4.50 | 133 |
| 3.50 | 34 | 5.00 | 133 | ||
| 4.00 | 34 | 6.00 | 133 | ||
| DN32 | 3.50 | 42 | DN125 | 4.50 | 140 |
| 4.00 | 42 | 5.00 | 140 | ||
| 5.00 | 42 | 6.00 | 140 | ||
| DN40 | 3.50 | 48 | DN150 | 4.50 | 159 |
| 4.00 | 48 | 5.00 | 159 | ||
| 5.00 | 48 | 6.00 | 159 | ||
| DN50 | 3.50 | 60 | DN200 | 6.00 | 219 |
| 4.00 | 60 | 7.00 | 219 | ||
| 5.00 | 60 | 8.00 | 219 | ||
| DN65 | 4.00 | 76 | DN250 | 7.00 | 273 |
| 5.00 | 76 | 8.00 | 273 | ||
| 6.00 | 76 | 10.00 | 273 | ||
| DN80 | 4.00 | 89 | DN300 | 8.00 | 325 |
| 5.00 | 89 | 9.00 | 325 | ||
| 6.00 | 89 | 10.00 | 325 |
Why Choose KOXY as Your Seamless Pipe Supplier?
Stable Production Capacity
KOXY maintains stable manufacturing and inventory capacity to support large-scale industrial projects and fast delivery requirements.
Strict Quality Control
All seamless steel pipes undergo dimensional inspection, material verification, and pressure testing before shipment.
One-Stop Piping Solution
We supply steel pipes, fittings, valves, and fire protection products together for convenient project procurement.
Global Export Experience
Our products are exported to Southeast Asia, the Middle East, South America, and other international markets.
OEM & Custom Support
Custom dimensions, surface treatments, packaging, and project solutions are available according to customer requirements.
Quality Assurance
KOXY follows strict quality management procedures throughout production and inspection processes.
Inspection and certification support includes:
Mill Test Certificate (MTC)
Hydrostatic Testing
Dimensional Inspection
Third-Party Inspection Support
Our quality control system helps ensure stable product performance and project compliance.
FAQ
Q: What is the difference between seamless pipe and welded pipe?
A: Seamless pipes are manufactured without welded joints, providing higher pressure resistance and better structural integrity than welded pipes.
Q: What standards are available for seamless steel pipes?
A: We provide seamless pipes according to ASTM, API, EN, and GB standards depending on project requirements.
Q: Can seamless steel pipes be galvanized?
A: Yes. Seamless pipes can be hot-dip galvanized for improved corrosion resistance in outdoor and water supply applications.
Q: What industries use seamless steel pipes?
A: Seamless pipes are widely used in fire protection, oil & gas, HVAC, industrial processing, and municipal infrastructure systems.
Q: Do you provide custom sizes and coatings?
A: Yes. KOXY supports OEM manufacturing, custom dimensions, coatings, and packaging solutions.
