Sihe Steel
Sihe Steel
Engineered for extreme offshore extraction, subsea hydraulics, and demanding process chemical heat exchangers.
Alloy 2205 (UNS S31803 / S32205) represents the pinnacle of modern duplex stainless steel engineering. By maintaining a carefully balanced 50:50 microstructural ratio of austenite and ferrite phases, it combines the ductile benefits of 300-series austenitic steels with the high mechanical strength and stress corrosion cracking (SCC) resistance of ferritic grades.
Global demand for Alloy 2205 coiled tubing is growing rapidly due to structural transitions in offshore and chemical processing environments. Key developments include:
How engineering procurement managers mitigate risk when sourcing Duplex 2205 tubing for high-pressure, corrosive systems.
Operating thousands of meters below sea level requires high collapse resistance and zero welds over long distances. Our continuous coiled tubing up to 32,800 feet (10,000m) ensures reliable hydraulic control and chemical injection without orbital joints.
Processing organic acids, chlorides, and sour gas requires materials that resist pitting and crevice corrosion. With a Pitting Resistance Equivalent Number (PREN) above 35, Alloy 2205 outperforms conventional alloys in high-temperature chloride systems.
Combining high strength with low thermal expansion helps designers optimize heat exchanger systems, resulting in lighter units with higher thermal performance for marine, geothermal, and solar energy systems.
At Liaocheng Sihe Stainless Steel Material LTD, we combine advanced manufacturing technology with efficient supply chain management. Our facility features six modern production lines that integrate computer-controlled cold drawing, real-time dimensional monitoring, and automated material handling.
Our online bright annealing technology is central to our process. This system performs inline heat treatment under protective atmospheres to relieve drawing stresses while maintaining a scale-free, high-quality surface finish. This eliminates post-annealing pickling steps, speeding up production and ensuring consistent material properties.
We perform 100% non-destructive testing (NDT), including hydrostatic testing up to 10,000 psi, inline eddy current verification, pneumatic leak tests, and mechanical deformation tests (flaring, flattening, and tensile tests).
Chemical compositions, mechanical properties, and dimensional tolerances engineered to global ASTM/ASME/EN standards.
| Material Grade | UNS Designation | Outer Diameter Range | Wall Thickness Range | Key Standards | Typical Applications |
|---|---|---|---|---|---|
| Duplex 2205 | UNS S31803 / S32205 | 0.125" - 1.000" (3.175 - 25.4 mm) | Up to 0.165" (4.19 mm) | ASTM A789, ASME SA789, EN 10216-5 | Subsea Umbilicals, Chemical Injectors, Petrochemical Exchangers |
| Super Duplex 2507 | UNS S32750 | 0.250" - 0.750" (6.35 - 19.05 mm) | Customized to Order | ASTM A789, ASME SA789 | Deepwater Oil & Gas, Desalination, Marine Process Piping |
| Incoloy 825 / Inconel 625 | UNS N08825 / N06625 | 0.125" - 1.000" (3.175 - 25.4 mm) | Up to 0.120" (3.05 mm) | ASTM B163, ASTM B704 | High-Temperature Geothermal, Acid Injection Lines |
| Austenitic 316L / 317L | UNS S31603 / S31703 | 0.040" - 1.000" (1.0 - 25.4 mm) | Customized to Order | ASTM A213, ASTM A269, JIS G3459 | HVAC, Marine Instrumentation, Solar Fluid Loops |
Providing value-added downstream services to meet complex engineering requirements.
Custom-fabricated geometries and tight-radius helical coils designed for compact heat exchangers and HVAC evaporators.
Protective gas heat treatment creates clean, scale-free inner and outer surfaces without acid pickling.
Automated cutting systems deliver tight-tolerance cut lengths, clean edges, and ready-to-weld tube ends.
Pre-fabricated flanged ends and orbital-ready preparations streamline field installation in hydraulic systems.
Where our Duplex 2205 and high-alloy tubing assemblies are deployed globally.
Our manufacturing practices are verified by leading global classification and inspection societies.
Answers to common technical, logistics, and supply chain questions from global procurement managers.
Explore our full line of corrosion-resistant, high-temperature stainless steel capillary and heat exchanger tubes.
