carbon schedule 40 seamless steel pipe

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 diameter while reducing wall thickness. This advanced manufacturing method allows for the efficient production of non-standard and custom-sized seamless pipes with high dimensional accuracy, making it ideal for applications requiring large-diameter thin-walled steel tubes that traditional rolling methods cannot easily supply.

The process begins with billet preparation using rotary piercing or pressure perforation techniques to form a hollow tube blank. The subsequent hot expansion phase involves heating the pipe to a precise temperature and then mechanically expanding its diameter under controlled conditions. This technique not only enhances material utilization but also improves surface finish and mechanical properties compared to conventional cold working methods.

Key features include:

• Outer Diameter Range: 6" to 36" (DN15–DN900)
• Wall Thickness: 4mm to 40mm
• Available Standards: ASTM A106, API 5L, EN 10216, DIN 2448, GB/T 8163, BS 1387
• Length Options: 2–12 meters, customizable per client needs
• Surface Finishes: Black painted, anti-rust oil, hot galvanized, cold galvanized, 3PE coating

This innovative technology enables manufacturers to produce high-performance seamless carbon steel pipes at lower costs while maintaining excellent structural integrity. The thermal expansion method ensures uniform wall thickness distribution, minimal internal stress, and improved resistance to corrosion and mechanical fatigue—making these pipes suitable for demanding environments such as oil and gas pipelines, steam systems, construction frameworks, and chemical processing plants.

Common applications include low-to-medium pressure fluid transport, natural gas distribution, heating systems, structural supports in infrastructure projects, and industrial piping networks where reliability and cost-efficiency are critical. With monthly production capacity reaching up to 30,000 metric tons, this product offers scalability for both small-scale engineering firms and large multinational contractors.

Customers often highlight the consistent quality, precise tolerances, and competitive pricing when comparing hot-expanded seamless pipes against standard rolled products. Many report reduced fabrication time due to fewer welds required, leading to faster project completion and lower installation costs. Additionally, the ability to customize dimensions and coatings meets unique project specifications across diverse industries—from offshore platforms to municipal water systems.

Frequently asked questions:

What makes hot expanded seamless steel pipe different from cold rolled or welded pipes? Answer: Unlike welded tubes, which may have weak joints, hot expanded pipes maintain full homogeneity throughout their structure. The absence of seams significantly enhances strength and leak resistance, especially under fluctuating pressures and temperatures.

Can I request special coatings or finishes for harsh environments? Answer: Yes, options like epoxy-based coatings, zinc galvanizing, or triple-layer polyethylene (3PE) provide enhanced protection against moisture, chemicals, and abrasion—ideal for marine, underground, or corrosive settings.

Is this product compliant with international standards? Answer: Absolutely. Each batch undergoes rigorous testing according to global benchmarks including ASTM, API, EN, DIN, and GB standards, ensuring compliance with safety, performance, and environmental regulations worldwide.

In summary, hot expanded seamless steel pipe represents a modern solution for engineers and procurement managers seeking durable, adaptable, and economically viable piping solutions. Its combination of technical precision, material efficiency, and wide-ranging applicability positions it as a preferred choice in global industrial sectors beyond China and East Asia.

Product Categories : Steel Pipe > Seamless Steel Pipe