Premium Large Seamless Steel Pipes from China's Top Factory & Suppliers - ISO Certified Quality
Large Seamless Steel Pipe Description
The Large Seamless Steel Pipe from Tianjin Yuantai Derun Steel Pipe Group (YUANTAI DERUN) is engineered for demanding industrial environments where strength, reliability, and safety are non-negotiable. Manufactured using advanced hot-rolled seamless technology, this product delivers superior mechanical performance, exceptional pressure resistance, and long-term durability for global pipeline projects.
Founded in 2002 and headquartered in Tianjin Daqiuzhuang Industrial Zone, China's largest steel pipe production base, YUANTAI DERUN is recognized among China's Top 500 Private Enterprises and Top 500 Manufacturing Companies. With comprehensive international certifications and strict quality systems, we provide seamless steel pipes that meet and exceed global standards.
What Makes Our Large Seamless Steel Pipe Different
Key Manufacturing Advantages
- Hot-rolled seamless process ensures consistent wall thickness and roundness
- No weld seams, eliminating structural weak points
- Fine-grain steel billets improve toughness and fatigue resistance
- Excellent dimensional accuracy for easier installation and welding
These features make YUANTAI DERUN seamless pipes a preferred choice for energy, infrastructure, and heavy-duty industrial projects worldwide.
Material Grades & Mechanical Performance
Our Large Seamless Steel Pipe is available in Grade B and X65, meeting API 5L PSL2 requirements for higher performance applications.
- Minimum Yield Strength: 245 MPa (35,500 psi)
- Ideal for standard oil, gas, and water pipelines
- Minimum Yield Strength: 448 MPa (65,000 psi)
- Designed for high-pressure and long-distance transmission systems
PSL2 – A Higher Standard of Reliability
Compared to PSL1, PSL2 demands:
- Stricter chemical composition control
- Mandatory Charpy V-Notch impact testing
- Enhanced non-destructive testing (NDT)
- Improved fracture toughness at low temperatures (down to -20°C or lower)
Typical Applications
Our Large Seamless Steel Pipes are widely used in environments where safety and performance are critical:
Dimensional Range & Customization Options
YUANTAI DERUN offers both standard and non-standard sizes, supporting project-specific engineering requirements. Tight tolerance control minimizes field adjustments and reduces installation costs.
- ASTM: Gr. A, B, C
- EN: S235, S275, S355, S420, S460
- JIS: SS400, STKR400, STKR490
- GB: Q195, Q235, Q355
- CSA: 300W, 350W
Product Specifications Overview
| Item | Description |
| Product Name | Large Seamless Steel Pipe |
| Manufacturing Process | Hot Rolled Seamless |
| Standard | API 5L PSL2, ASTM A106 |
| Grades | Grade B, X65 |
| Pipe Shape | Round |
| Surface Finish | Black, oiled, or customized |
| Testing | UT, Charpy Impact, Hardness, Chemical Analysis |
| Certifications | API 5L/5CT, ISO 9001, CE, BV, DNV, ABS |
Rigorous Quality Control & Global Certification
Quality is embedded into every stage of production at YUANTAI DERUN. From raw material sourcing to finished pipe inspection, all products undergo strict testing protocols:
- Dimensional and visual inspection
- Mechanical testing (yield, tensile, hardness)
- Chemical composition and metallographic analysis
- Ultrasonic testing (UT) and corrosion resistance testing
Contact us today to discuss your technical requirements and customized solutions.
Frequently Asked Questions
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Q What is a large seamless steel pipe and how is it manufactured?A large seamless steel pipe is produced through a hot-rolled seamless process, where a solid steel billet is pierced and elongated without any welding. This results in a pipe with no weld seams, offering uniform wall thickness, superior structural integrity, and higher pressure resistance compared to welded alternatives.
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Q What standards do your large seamless steel pipes comply with?Our large seamless steel pipes comply with API 5L PSL2 and ASTM A106 standards. They are also certified to ISO 9001, ISO 14001, EU CE (EN10219/10210), BV, DNV, ABS, JIS, and LEED, ensuring full compliance with global project requirements.
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Q What grades are available and what are their mechanical properties?We offer Grade B with a minimum yield strength of 245 MPa (35,500 psi), suitable for standard oil, gas, and water pipelines, and X65 with a minimum yield strength of 448 MPa (65,000 psi), designed for high-pressure and long-distance transmission systems. Custom grades are also available upon request.
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Q What is the difference between PSL1 and PSL2 for seamless steel pipes?PSL2 (Product Specification Level 2) imposes stricter requirements than PSL1, including tighter chemical composition control, mandatory Charpy V-Notch impact testing, enhanced non-destructive testing (NDT), and improved fracture toughness at low temperatures down to -20°C or lower. PSL2 is recommended for critical and high-performance pipeline applications.
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Q Can YUANTAI DERUN supply customized sizes and steel grades?Yes. YUANTAI DERUN provides both standard and non-standard sizes with tight dimensional tolerances. We support customization across multiple international standards including ASTM (Gr. A, B, C), EN (S235–S460), JIS (SS400, STKR400, STKR490), GB (Q195, Q235, Q355), and CSA (300W, 350W) to meet specific project engineering requirements.
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Q What quality testing procedures are applied to each pipe?Every pipe undergoes a comprehensive quality control process including dimensional and visual inspection, mechanical testing (yield strength, tensile strength, hardness), chemical composition and metallographic analysis, as well as ultrasonic testing (UT) and corrosion resistance testing. All testing is conducted in accordance with international standards to guarantee product reliability and safety.