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YTDR Large Seamless Steel Pipe Dimensions

Yuantai Derun offers premium Large Seamless Steel Pipes—precision-engineered, globally certified (ISO, CE, DNV), and backed by 24+ years of expertise. As a Top 500 Chinese manufacturer with 5A management, we ensure unmatched quality, sustainability, and reliability for global infrastructure projects.

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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

Unlike welded pipes, Large Seamless Steel Pipes are produced without weld seams, ensuring a uniform structure throughout the pipe body. This manufacturing advantage significantly reduces the risk of failure under high pressure, making the product ideal for critical transmission systems.

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.

Available Grades

● Grade B
- ● Minimum Yield Strength: 245 MPa (35,500 psi)
- ● Ideal for standard oil, gas, and water pipelines
● X65
- ● 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:

● High-pressure oil & gas transmission pipelines
● Offshore and submarine pipeline systems
● Arctic and cold-climate infrastructure
● Power generation and petrochemical facilities
● Structural and mechanical engineering projects

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.

Steel Grade Customization

● 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

Our Large Seamless Steel Pipes are certified to ISO9001, ISO14001, OHSAS18001, EU CE (EN10219/10210), BV, JIS, DNV, ABS, and LEED, ensuring full global compliance.