Sihe Steel
Sihe Steel
High-performance custom alloy tubing manufactured to comply strictly with global ASTM, ASME, EN, JIS, and GB quality standards.
Liaocheng Sihe Stainless Steel Material LTD is a globally recognized manufacturer specializing in high-grade stainless steel coiled tubes, seamless coiled tubing, and precision polishing tubes. Operating six high-performance production lines, our manufacturing systems conform strictly to stringent global specifications including GB, ASTM, ASME, JIS, and EN standards.
ASTM A269 specifies seamless and welded austenitic stainless steel tubing for general service, requiring precise control over dimensional tolerances and mechanical integrity. The 310S alloy (UNS S31008) represents a premium high-carbon, austenitic stainless steel featuring a high concentration of Chromium (24-26%) and Nickel (19-22%). This unique chemical composition ensures exceptional oxidation resistance and structural stability under service temperatures reaching up to 1150°C (2100°F).
Our industrial coiled tubing is developed to eliminate the systemic risks associated with traditional straight-tube coupling welds. By delivering single, continuous lengths of up to 32,800 feet (10,000 meters), we empower engineers in the marine, offshore, petrochemical, and semiconductor sectors to install reliable pipelines with minimized leakage interfaces.
Delivering high-integrity piping systems to over 30 countries and regions including the United States, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Our specialized manufacturing facility processes diverse high-performance alloys including Austenitic 316L, 304, 304L, 321, 317L, 309S, 310S, INCOLOY 800, Incoloy 825, Inconel 625, Duplex 2205, and Super Duplex 2507. Standard dimensions span outside diameters (OD) from 0.125 inches (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inches (3 mm).
Modern industrial systems demand enhanced high-temperature resistance and reliable corrosion barriers. The transition toward subsea oil extraction, deep geothermal energy, carbon capture, utilization, and storage (CCUS), and hydrogen fuel infrastructure has changed the requirements of piping procurement.
Supply Chain Integrity: Organizations now prioritize materials that guarantee high-pressure containment and mechanical durability. Our coiled tubing minimizes joint points, reducing potential path-of-leakage hazards during high-pressure gas distribution and deep subsea exploration.
China Industry 4.0 Efficiency: Liaocheng Sihe has introduced state-of-the-art inline bright annealing systems, allowing continuous thermal treatment under protective atmospheres. This guarantees a clean, oxide-free surface finish, optimal ductility, and corrosion resistance without compromising metallurgical structure.
Our coiled stainless steel tubing is engineered to perform across critical industrial sectors globally.
We provide support beyond standard manufacturing, offering secondary processing services tailored for complex engineering specifications.
Full dimensional flexibility for various material grades including 304, 316L, and 2205, covering typical OD sizes from 6.35mm to 19mm.
Highly accurate spiral coiling and tube bending designed to match tight tolerances in high-efficiency heat exchangers and reactors.
High-precision mechanical and laser cutting, with automatic straightening mechanisms ensuring end-to-end alignment.
Inline bright annealing and acid pickling/passivation treatments yield a smooth, ultra-clean surface layer resistant to localized pitting.
Seamlessly rolled or welded flanges customized to secure strong connections within automotive exhaust and high-pressure chemical systems.
Comprehensive QA procedures including 100% pneumatic testing, hydraulic burst tests, flattening, expansion, flaring, and hardness validations.
At Liaocheng Sihe, quality assurance forms the foundation of our manufacturing philosophy. Our production procedures conform to ISO 9001 and CE directives, ensuring every coiled pipe batch achieves standard physical and mechanical properties. To support smooth global trade, we provide comprehensive documentation packages for international shipping.
Our material testing protocols include:
Technical support, commercial terms, and engineering inquiries.
When selecting coiled tubing for high-temperature systems, mechanical engineers must consider the service temperature threshold. While 316L offers excellent resistance to chloride-induced pitting, it undergoes rapid oxidation above 870°C. In contrast, ASTM A269 310S (UNS S31008) features a high Chromium and Nickel content that forms a protective, adherent chromium oxide layer at temperatures up to 1150°C under continuous service conditions.
This protection makes 310S the industry choice for fluid control systems, combustion chambers, petrochemical cracking equipment, and high-efficiency heat exchangers where structural integrity and creep resistance are required.
Our Liaocheng factory leverages advanced metallurgy and automated controls to optimize production efficiency and quality. By integrating precision drawing benches with digital bright annealing furnaces, we maintain consistent grain size and structural uniformity across long coils.
This automated approach minimizes raw material waste and reduces labor requirements. This efficiency translates directly into cost-effective pricing for our international procurement partners, without compromising on dimensional and structural quality.
Explore our full line of specialized stainless steel piping products.
Seamless long-length tubes designed for instrumentation, hydraulic lines, and heat exchangers.
High-precision micro-bore tubing for chromatography, medical, and control applications.
High-temperature, corrosion-resistant pipes designed for industrial boilers and condenser units.
Global shipment of high-pressure seamless coiled pipelines across diverse grades and dimensions.
