Sihe Steel
Sihe Steel
Discover our primary lineup of industrial-grade stainless steel products, engineered to comply with strict global safety and efficiency metrics.
Seamless stainless steel tubes and coiled tubing represent the vital arteries of modern industrial infrastructure. Unlike welded tubes, seamless options offer uniform structural integrity, ensuring high resistance to pressure, stress cracking, and localized corrosion. At Liaocheng Sihe Stainless Steel Material LTD, we specialize in high-nickel alloys and duplex stainless steels, delivering specialized solutions to partners operating in harsh conditions.
Whether for offshore subsea umbilicals, analytical instrumentation, aerospace fluid systems, or pharmaceutical heat exchangers, our mission is clear: to engineer products that eliminate downtime risks and uphold regulatory compliance globally. Our automated drawing processes and bright annealing technologies ensure smooth internal diameters (ID) and precise tolerance controls.
We manufacture to international standards (GB, ASTM, ASME, JIS, EN) with precise metallurgical control to guarantee structural reliability.
Standard grades including 304/304L, 316/316L, 321, 317L, 309S, and 310S. Engineered for corrosion resistance, ductility, and high-temperature oxidation protection.
Duplex 2205 and Super Duplex 2507. Providing double the mechanical strength of austenitic grades and high resistance to chloride stress corrosion cracking.
Incoloy 800, Incoloy 825, and Inconel 625. These superalloys deliver performance under high pressures and temperatures up to 1093°C (2000°F) in highly acidic environments.
| Product Specification Parameter | Imperial Ranges | Metric Ranges |
|---|---|---|
| Outer Diameter (OD) | 0.125 inch to 1.00 inch | 3.175 mm to 25.4 mm |
| Wall Thickness (WT) | Up to 0.118 inch (Max 0.165 inch customized) | Up to 3.0 mm (Max 4.2 mm customized) |
| Continuous Length (Coiled) | Up to 32,800 feet | Up to 10,000 meters (orbital weld-free joints) |
| Manufacturing Standards | ASTM A269, ASTM A213, ASME SA213, EN 10216-5, JIS G3459, GB/T 14976 | |
We operate three dedicated coiled tubing production lines, ensuring high dimensional consistency and smooth inner walls.
Helping engineering procurement managers mitigate cost risks while maintaining strict ASTM and EN technical compliance.
We supply complete compliance paperwork including Certificates of Analysis, Material Conformance (EN 10204 3.1), Origin certification, and cargo insurance documentation.
Leveraging high production capacity, samples are processed within 7 days, and mass production is completed in 20-30 days, optimizing your project timeline.
Our proximity to Qingdao and Tianjin ports, combined with optimized export packaging, helps keep sea freight costs competitive for global routes.
For offshore and petrochemical applications, subsea umbilicals represent a critical failure point. In deep offshore extraction sites, replacing a corroded or fractured capillary line can cost millions. Procuring ASTM-tested, bright annealed seamless coiled tubing from Liaocheng Sihe helps reduce the risk of structural failure under deep water conditions.
Every meter of seamless tubing undergoes verification to ensure chemical composition and pressure ratings.
Our online bright annealing technology operates under a controlled hydrogen atmosphere, recrystallizing the steel grain structure to improve ductility and maintain a smooth, oxidation-free finish.
Each coil is pressure-tested to detect microscopic leaks. We execute 100% air tightness tests alongside optional hydrostatic testing based on project needs.
Our laboratory performs hardness checks, tensile testing, compression verification, flaring tests, and bend testing to verify the material stands up to field processing.
We maintain a rigorous quality management system to comply with global structural standards.
Value-added fabrication services tailored to meet specific industrial system dimensions.
We process seamless tubing into coils, spiral shapes, and heat exchanger configurations in alloys such as 304, 316L, and Duplex 2205.
High-precision laser and mechanical cutting services that provide clean, burr-free ends for subsequent orbital welding or fitting installations.
We provide chemical pickling, mechanical polishing (up to 400 grit), and electropolishing (EP) to meet high-purity requirements in the semiconductor and pharma sectors.
Liaocheng Sihe's seamless tubing products are utilized across specialized industrial systems.
Understanding how evolving material specifications affect modern industrial systems.
Ultra-high purity (UHP) gas delivery systems require seamless tubing with minimal inner-surface roughness to prevent particulate contamination. Our bright annealed and polished 316L tubes help minimize moisture and gas entrapment, supporting stability in critical processes.
Offshore operations are moving into deeper waters and high-pressure, high-temperature (HPHT) reservoirs. Duplex 2205 and Super Duplex 2507 are increasingly specified over standard 316L due to their higher mechanical strength and resistance to stress cracking in sour service environments containing hydrogen sulfide ($H_2S$) and chlorides.
Traditional straight pipe configurations require numerous orbital field welds, increasing installation time and inspection costs while introducing potential leak paths. Long continuous coiled tubing up to 10,000 meters reduces the number of connections needed for subsea umbilical and downhole chemical injection applications.
Answers to common questions regarding specifications, logistics, testing, and custom capabilities.
Browse additional specifications and standard stock items from our manufacturing inventory.
