Hydraulic Seamless Steel Tube/ Seamless

High-Quality Hot Expanded Seamless Steel Pipe – Durable Carbon Steel Tubing for Industrial and Infrastructure Projects

Hot expanded seamless Steel Pipe is a premium carbon steel product engineered through advanced thermal expansion techniques to deliver enhanced performance in demanding industrial environments. Unlike traditional rolling or welding methods, this process starts with a precision-formed tube blank that undergoes controlled heating and internal pressure application—resulting in a uniform increase in outer diameter while maintaining seamless integrity. This innovative manufacturing approach enables the production of large-diameter, thin-walled pipes that are both lightweight and structurally robust, making them ideal for non-standard applications where conventional stock items fall short.

Key Features:

• Diameter Range: 6" to 36" (DN15–DN900) – Ideal for custom pipeline configurations
• Wall Thickness: 4mm to 40mm – Flexible options for low- to medium-pressure systems
• Compliant with Global Standards: ASTM A106, API 5L, EN 10217, DIN 2448, GB/T 8163, BS 1387
• Custom Lengths Available: 2–12 meters – Optimized for project-specific logistics
• Surface Finishes: Black paint, rust-inhibiting oil, galvanizing, 3PE coating – Tailored to environmental conditions
• High Production Efficiency: Up to 30,000 metric tons per month – Ensures reliable supply chain support

The manufacturing process begins with billet preparation using rotary piercing or pressure perforation to create a high-quality hollow tube blank. Following precise heat treatment, controlled mechanical force expands the diameter uniformly without compromising metallurgical consistency. The outcome is a seamless pipe with superior dimensional accuracy, improved surface finish, and optimized mechanical properties such as tensile strength, ductility, and weldability. This method not only reduces material waste but also enhances yield rates compared to traditional fabrication techniques like cold rolling or welded assembly—particularly beneficial when producing rare or oversized sizes not found in standard inventories.

This type of carbon steel tubing excels in fluid transport systems operating under low to medium pressure, including natural gas distribution networks, steam heating pipelines, coal gas lines, and municipal infrastructure projects. It serves as a foundational element in oil and gas facilities, chemical processing units, and power generation plants due to its ability to withstand variable operational stresses and resist corrosion over extended periods. Whether deployed offshore, in arid climates, or in coastal regions, hot expanded seamless steel pipe maintains structural integrity and long-term reliability across diverse environmental conditions.

Global users from Europe, North America, South America, and Asia have consistently praised the product’s engineering precision, batch-to-batch consistency, and adaptability to complex project requirements. Many procurement teams highlight how the flexibility in size customization significantly reduces lead times and simplifies logistics—especially when sourcing non-standard components. Additionally, the availability of multiple protective coatings ensures compatibility with extreme weather patterns, from desert heat to marine humidity, without sacrificing performance or lifespan.

Frequently Asked Questions:

What distinguishes hot expanded seamless steel pipe from cold rolled or welded tubes?
Answer: Hot expansion uses controlled thermal energy and internal pressure to enlarge the tube diameter while preserving seamless structure, resulting in fewer defects and better grain refinement than welded alternatives. Cold-rolled pipes often exhibit residual stress and limited scalability, whereas hot-expanded versions offer greater uniformity and cost-effective production for custom dimensions.

Can these pipes handle high-pressure applications?
Answer: Yes, when produced according to standards like API 5L Grade B or ASTM A106 Grade B, they can safely operate at pressures up to 10 MPa depending on wall thickness and grade selection. For higher-pressure scenarios, specialized alloy grades and post-production heat treatments are available upon request.

How does thermal expansion improve resource efficiency and reduce scrap?
Answer: By expanding a smaller-diameter blank instead of cutting and welding multiple sections, the method minimizes raw material loss, lowers labor costs, and boosts throughput—especially valuable for producing uncommon or custom pipe sizes not typically stocked in global markets.

Are there restrictions on maximum length or weight per piece?
Answer: Standard lengths range from 2 to 12 meters, but longer segments can be fabricated via butt welding if needed. Weight per unit varies by outer diameter and wall thickness, typically between 10 kg and 500 kg, offering versatility for transportation and installation planning.

Engineers, procurement specialists, and infrastructure developers worldwide rely on hot expanded seamless steel pipe for its blend of durability, adaptability, and economic value. Backed by rigorous international certifications and continuous innovation in process control, this product represents a leading-edge solution in modern steel fabrication, meeting evolving demands across global industries—from energy and chemicals to construction and utilities.

Product Categories : Steel Pipe > Seamless Steel Pipe