Steel Pipe, Seamless, 8-inch SCH40, ASME

Basic Info

Model No.: 1/2inch-24inch

Brand: WH

Additional Info

Packaging: BUNDLE ,CAPS ,

Productivity: 100000TONS

Transportation: Ocean,Air

Place of Origin: CANGZHOU

Supply Ability: 100000TONS

Certificate: ISO9001

Payment Type: L/C,T/T,Western Union

Incoterm: FOB

Product Description

Hot expanded seamless steel tubes represent a transformative leap in pipe manufacturing technology, delivering superior performance and customization for critical infrastructure across global industries. Unlike traditional cold-rolled or extruded methods, this advanced thermo-mechanical process utilizes controlled heating between 900°C and 1200°C followed by precise radial expansion to produce high-integrity, non-standard configurations with exceptional dimensional accuracy. By increasing outer diameter while uniformly reducing wall thickness—from as thin as 4mm up to 40mm—this technique enables rapid fabrication of lightweight yet robust piping solutions at significantly reduced costs compared to conventional techniques. Widely adopted in oil & gas, power generation, chemical processing, and heavy construction sectors, these tubes have become essential components in modern engineering projects worldwide. Key Features Engineers benefit from unparalleled control over geometry, mechanical properties, and surface finish through optimized temperature gradients and expansion rates. The resulting microstructure exhibits refined grain structure, enhanced ductility, and consistent tensile strength along the entire length of each pipe. Available in nominal sizes ranging from DN 6" to DN 36", these products meet both standard specifications and highly specialized needs where off-the-shelf options fall short. Compliance with internationally recognized standards such as ASTM A53, A106, API 5L, ASME B36.10M, and EN 10217 ensures traceability, regulatory compliance, and quality assurance for global markets. Additionally, the method supports scalable production for bulk orders without compromising precision or material efficiency—an ideal choice for cost-sensitive, high-volume applications. Detailed Description The manufacturing journey begins with a hollow billet formed via rotary piercing or pressure perforation, then heated to a critical range that maximizes plastic deformation without inducing cracking. At this stage, precision rollers or mandrels apply uniform radial force to expand the outer diameter while proportionally decreasing wall thickness. This unique combination of thermal energy and mechanical deformation not only improves formability but also refines the metal’s internal structure, leading to superior fatigue resistance, corrosion endurance, and overall toughness compared to cold-worked alternatives. Post-expansion cooling strategies—including controlled quenching or tempering—further enhance mechanical characteristics, making these tubes particularly suitable for high-stress environments such as subsea risers, boiler systems, and structural frameworks. While initially developed for carbon steel, ongoing advancements in furnace design and alloy compatibility are now enabling broader use of low-alloy and stainless variants, expanding applicability across diverse industrial domains. Applications These thermally expanded seamless steel tubes are extensively used in offshore drilling platforms, long-distance pipeline networks for hydrocarbon transport, feedwater lines in thermal power stations, heat exchanger assemblies, and load-bearing structures in bridges and skyscrapers. Their ability to deliver oversized yet lightweight sections makes them especially valuable in confined spaces requiring maximum load capacity with minimal footprint. They also serve as premium precursors for welded pipe segments in high-pressure service conditions, offering excellent weldability and long-term durability under dynamic loading. Whether sourcing ultra-thin wall tubing (down to 4mm) for compact heat exchangers or large-diameter pipes (up to 36 inches) for subsea applications, engineers gain access to a scalable, proven solution backed by rigorous testing and real-world performance data. Customer Feedback Procurement managers and technical leads from Europe, North America, and Southeast Asia consistently highlight the advantages of adopting hot-expanded seamless steel tubes. One project lead in Germany noted, “Switching to hot-expanded tubes cut our lead time by nearly 40% for offshore rig components—without any loss in quality.” Another client in Canada emphasized the consistency in wall thickness over extended lengths: “We were able to automate our welding processes seamlessly because variation was minimal—even over hundreds of meters.” These testimonials reflect growing trust in thermal expansion as a mature, reliable, and economically efficient alternative to traditional seamless pipe manufacturing techniques. Frequently Asked Questions What distinguishes hot expanded Seamless Steel Pipe from cold rolled pipe? Hot expansion occurs at elevated temperatures, allowing greater plastic deformation without cracking, resulting in better formability, fewer defects, and improved mechanical properties compared to cold-working methods. Is this process suitable for alloy steels? Yes, although most current applications focus on carbon steel, advancements in furnace control and material science are expanding its use to low-alloy and stainless variants. How does thermal expansion affect mechanical strength? When properly executed, the process refines the microstructure, enhancing tensile strength and toughness—especially when combined with post-expansion heat treatments like quenching or tempering. Can I order custom dimensions outside the standard range? Absolutely—the flexibility of thermal expansion enables the creation of bespoke sizes, including ultra-thin walls (down to 4mm) and unusually large diameters (up to 36 inches), which are difficult to achieve via traditional rolling methods. What certifications do these pipes carry? They comply with internationally recognized standards such as ASTM, ASME, and EN, ensuring traceability, quality control, and compliance with safety regulations in global markets.

Product Categories : Steel Pipe > Seamless Steel Pipe