Thickwall Seamless Steel Pipe made in China

Hot Expanded Seamless Steel Pipe – High-Quality Carbon Steel Tubing for Industrial Applications

Hot expanded seamless Steel Pipe is a specialized type of carbon steel tubing produced through a thermal expansion process that increases the outer diameter while reducing wall thickness. This advanced manufacturing technique transforms standard seamless pipes into high-performance, cost-efficient solutions tailored for demanding engineering environments. Known also as hot-expanded carbon steel pipe or black seamless steel pipe, this product bridges critical gaps in large-diameter thin-walled tube availability across global markets.

The production begins with billet preparation using rotary piercing or pressure perforation methods to create initial hollow blanks. These are then subjected to controlled heating and mechanical expansion—often via skew rolling or drawing—to achieve precise dimensional control. The result is a seamless pipe with enhanced surface integrity, uniform wall thickness, and excellent mechanical properties suitable for both structural and fluid transport applications.

Key Features:

• Outer Diameter Range: 6" to 36" (DN15–DN1200)
• Wall Thickness Options: 4mm to 40mm (SCH10–SCH160)
• Material Standards: ASTM A106, API 5L, EN 10216, DIN 2448, GB/T 8163, BS 1387
• Length Customization: 2–12 meters, based on client specifications
• Surface Treatments Available: Black paint, varnish, anti-rust oil, hot galvanizing, cold galvanizing, 3PE coating
• High Production Capacity: Up to 30,000 metric tons per month

This thermal expansion method offers significant advantages over traditional rolling techniques—it enables rapid thickening and diameter adjustment without compromising metallurgical quality. It's particularly effective in producing non-standard, custom-sized seamless tubes economically, making it ideal for industries requiring unique configurations such as oil and gas infrastructure, power generation systems, chemical processing plants, and construction frameworks. Unlike conventional seamless pipes, hot-expanded versions provide better dimensional accuracy and reduced material waste due to their optimized manufacturing cycle.

Common applications include low-to-medium pressure fluid conveyance, coal gas pipelines, steam distribution networks, structural supports in heavy machinery, and pressure vessels in petrochemical facilities. The versatility of these pipes makes them indispensable in sectors where reliability, durability, and compliance with international standards are paramount.

Users frequently praise the consistent performance of hot expanded seamless steel pipe under varying environmental conditions. Many report improved weldability, minimal distortion during installation, and extended service life compared to other types of carbon steel tubing. Industry professionals appreciate how this technology allows for efficient scaling of production while maintaining tight tolerances—an essential factor for global procurement managers seeking dependable suppliers.

Frequently Asked Questions:

What distinguishes hot expanded seamless steel pipe from cold rolled or welded alternatives? Hot expansion ensures superior metallurgical continuity and eliminates weld seams, resulting in higher tensile strength and resistance to internal pressure fluctuations. Cold-rolled or welded pipes often exhibit lower fatigue resistance and greater susceptibility to corrosion at joints.

Is it possible to customize wall thickness and length? Yes, manufacturers offer flexible customization options within the specified range (4–40 mm wall thickness, 2–12 m length) to meet specific project requirements, including those involving offshore platforms or industrial boiler systems.

How does surface treatment affect longevity? Proper surface finishing—such as hot galvanizing or 3PE coating—significantly enhances corrosion resistance, especially in aggressive environments like marine installations or chemical processing units.

What are the typical delivery timelines? After receipt of deposit or letter of credit at sight, lead time is approximately 20 working days, ensuring timely delivery for urgent infrastructure projects worldwide.

Product Categories : Steel Pipe > Seamless Steel Pipe