Hydraulic Seamless Steel Tube/ Seamless

Premium Hot Expanded Seamless Steel Pipe – High-Performance Carbon Steel Tubing for Industrial and Infrastructure Applications

Engineered for superior performance in demanding environments, hot expanded seamless Steel Pipe represents a modern breakthrough in carbon steel fabrication technology. Unlike traditional welding or cold rolling methods, this advanced manufacturing process begins with a precisely formed tube blank that undergoes controlled thermal expansion under internal pressure—resulting in an even increase in outer diameter while preserving the seamless structure. The outcome is a product offering enhanced mechanical properties, precise dimensional control, and reduced weight, making it ideal for custom piping solutions where standard off-the-shelf options fall short.

Key Features:

• Diameter Range: 6" to 36" (DN15–DN900) – Enables tailored pipeline configurations for unique project requirements
• Wall Thickness: 4mm to 40mm – Supports low to medium-pressure fluid transport systems effectively
• Compliant with Global Standards: ASTM A106, API 5L, EN 10217, DIN 2448, GB/T 8163, BS 1387 – Ensures international quality assurance
• Custom Lengths Available: 2–12 meters – Streamlines logistics and reduces installation complexity
• Surface Finishes: Black paint, rust-inhibiting oil, galvanizing, 3PE coating – Enhances durability across diverse climates
• High Production Efficiency: Up to 30,000 metric tons per month – Guarantees consistent supply chain support

The production journey starts with billet preparation using rotary piercing or pressure perforation to create a high-quality hollow tube blank. Following precise heat treatment, mechanical force expands the diameter uniformly without disrupting the metallurgical integrity. This advanced method yields superior tensile strength, enhanced ductility, and excellent weldability—qualities critical for long-term performance in harsh conditions. Compared to conventional techniques such as cold rolling or welded assembly, hot expansion minimizes material waste, improves yield rates, and offers cost-effective production for rare or oversized dimensions not commonly found in standard inventories.

This type of carbon steel tubing excels in applications involving low to medium-pressure fluid conveyance such as natural gas distribution networks, steam heating systems, coal gas pipelines, 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 resist corrosion, withstand variable operational stresses, and maintain structural stability over decades—even in extreme environmental conditions including desert heat, marine humidity, and coastal exposure.

Global users from Europe, North America, South America, and Asia have consistently recognized the product’s engineering excellence, batch-to-batch consistency, and adaptability to complex engineering challenges. Procurement teams highlight how customizable sizes reduce lead times significantly and simplify transportation planning—especially when sourcing non-standard components. With multiple protective coatings available, including epoxy-based 3PE and galvanized finishes, these pipes ensure compatibility with varying climatic demands without compromising lifespan or performance.

Frequently Asked Questions:

What sets hot expanded seamless steel pipe apart from cold rolled or welded alternatives?
Answer: Hot expansion leverages thermal energy and internal pressure to uniformly enlarge the tube diameter while maintaining a seamless microstructure—reducing defects and improving grain refinement compared to welded counterparts. Cold-rolled tubes often suffer from residual stress and limited scalability, whereas hot-expanded versions offer greater uniformity, lower defect rates, and economic advantages for custom dimensions.

Can this pipe handle high-pressure scenarios?
Answer: Yes, when manufactured according to standards such as API 5L Grade B or ASTM A106 Grade B, it can safely operate at pressures up to 10 MPa depending on wall thickness and grade selection. For elevated pressure needs, specialized alloy grades and post-production heat treatments are available upon request.

How does the thermal expansion technique improve resource efficiency and reduce scrap?
Answer: By expanding a smaller-diameter blank instead of assembling multiple welded sections, the method reduces raw material loss, lowers labor costs, and increases throughput—particularly valuable for producing uncommon or custom pipe sizes not typically stocked globally.

Are there limitations 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 required. Weight per unit varies by outer diameter and wall thickness, typically between 10 kg and 500 kg, offering flexibility for transportation and installation planning.

Engineers, procurement specialists, and infrastructure developers worldwide choose hot expanded seamless steel pipe for its combination of robustness, customization capabilities, and economic value. Backed by rigorous international certifications and continuous innovation in process control, this product stands at the forefront of modern steel manufacturing, meeting evolving industry demands across energy, chemicals, utilities, and construction sectors globally.