Sihe Steel
Sihe Steel
Engineered to meet stringent global standards including ASTM, ASME, EN, JIS, and GB.
Seamless coiled tubing engineered for heavy-duty marine hydraulics, process analysis, and offshore applications.
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High-durability 304 grade tubing options for standard chemical transport, food processing, and heat exchange systems.
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Ultra-low carbon 316L piping featuring superior intergranular corrosion resistance post-welding.
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Titanium-stabilized austenitic steel configured for high-temperature service and structural integrity.
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Duplex stainless steel pipe offering high mechanical strength combined with high chloride SCC resistance.
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High-chromium nickel steel designed for oxidation resistance in temperatures up to 1035°C (1900°F).
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Seamless coiled configurations for subsea control lines, chemical injection, and chromatographic instruments.
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High strength and premium fatigue resistance in chloride-heavy process lines and subsea control systems.
Inquire NowIn modern process engineering and subsea exploration, material selection can determine the failure limit of a system. 316 stainless steel coiled tubing has established itself as the industry benchmark for demanding industrial applications. The integration of 2-3% Molybdenum (Mo) into the austenitic Fe-Cr-Ni matrix changes the alloy's resistance to local corrosion mechanisms. Specifically, it combats pitting and crevice corrosion caused by saline environments, acidic process streams, and chloride-laden fluids.
At Liaocheng Sihe Stainless Steel Material LTD, our engineering teams leverage precise thermal processing to refine the grain structure of our 316 and 316L materials. Lowering the carbon content to a maximum of 0.03% in the 316L variant prevents chromium carbide precipitation at grain boundaries during welding or high-temperature operations, eliminating susceptibility to intergranular corrosion.
The corrosion resistance threshold of our 316/316L coiled tubing is calculated using: PREN = %Cr + 3.3%Mo + 16%N. With tightly managed elemental tolerances, our 316L alloy consistently achieves a high PREN value, ensuring reliable passivation under thermal stress and acidic exposure.
Decade-long legacy in delivering high-yield, ultra-long corrosion resistant tubing globally.
Liaocheng Sihe Stainless Steel Material LTD operates six advanced production lines, including three production lines dedicated to long-length coiled configurations. Our facility integrates state-of-the-art online bright hydrogen annealing (BA) technology. This heat treatment occurs in a protective hydrogen atmosphere, allowing us to soften the stainless steel pipe inline. This preserves a bright surface finish and eliminates internal stresses without requiring post-annealing chemical pickling.
Our manufacturing envelops outer diameters ranging from 0.125 inches (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inches (3.0 mm). By offering continuous spool lengths up to 32,800 feet (10,000 meters) without orbital butt welds, we supply high-integrity lines for subsea control systems, downhole chemical injection, and chemical process instrumentation.
Match alloy chemistry to your specific pressure, temperature, and environmental parameters.
| Alloy Grade | UNS Designation | Nominal Chemistry (Cr, Ni, Mo, Others) | Yield Strength (Mpa, Min) | Primary Industrial Use Case |
|---|---|---|---|---|
| 304 / 304L | S30400 / S30403 | 18Cr, 8Ni | 205 | General HVAC, domestic refrigeration, heat exchangers. |
| 316 / 316L | S31600 / S31603 | 16.5Cr, 11Ni, 2.1Mo | 220 | Offshore oil & gas control lines, chemical processing, biopharma. |
| Duplex 2205 | S31803 / S32205 | 22Cr, 5.5Ni, 3.2Mo, 0.18N | 450 | Subsea umbilical systems, sour gas wells, brackish water systems. |
| Super Duplex 2507 | S32750 | 25Cr, 7Ni, 4Mo, 0.28N | 550 | High-saline reverse osmosis desalination, marine deepwater systems. |
| Incoloy 825 | N08825 | 21Cr, 42Ni, 3Mo, 2.2Cu, Ti stab. | 240 | High-temperature sulfuric and phosphoric acid transport lines. |
| Inconel 625 | N06625 | 21.5Cr, 61Ni, 9Mo, 3.6Nb | 415 | Severe oilfield sour gas, high-pressure subsea control, exhaust systems. |
Delivering high-integrity, corrosion-resistant tubing to critical global infrastructure.
Our coiled tubes optimize thermal efficiency by minimizing the joints required in heat exchanger coils, decreasing leak points in high-temperature processes.
Engineered to withstand high-pressure refrigerants and thermal cycling, ensuring system integrity and preventing leaks in commercial cooling units.
Designed for acid and solvent transport, our 316L and Duplex 2205 coiled tubing resists pitting and crevice corrosion in complex chemical reactions.
Electropolished ID profiles prevent product adhesion, resist clean-in-place (CIP) chemicals, and comply with strict food contact safety standards.
Ultra-clean inner diameter (ID) surfaces minimize bacterial growth and biofilm formation, ensuring compliance in water-for-injection (WFI) loops.
Ideal for steam generator instrumentation, geothermal energy capture, and solar thermal loops that subject tubing to high pressures and temperatures.
Engineered for high mechanical reliability, our downhole control lines handle deepwater pressures and aggressive hydrocarbon chemistries.
Designed to withstand vibration, heat, and high-pressure hydraulic cycles in aircraft controls, marine systems, and hydrogen fueling systems.
At Liaocheng Sihe Stainless Steel Material LTD, we offer custom processing options to support diverse system designs. Our downstream processing capabilities include:
Our laboratory executes strict mechanical, metallurgical, and pressure testing protocols.
Our manufacturing processes comply with strict global verification requirements, ensuring consistent performance in demanding environments. Every coil undergoes comprehensive quality assurance procedures, including 100% hydrostatic and pneumatic leak checks, chemical composition analysis, mechanical testing (flaring, bending, hardness, and tensile properties), and eddy current inspections. Our material testing processes are documented and certified, with material test certificates (MTC) according to EN 10204 3.1 supplied with all shipments.
Innovating to support subsea operations at greater depths and higher pressures.
As oil and gas exploration progresses into deeper offshore waters, subsea umbilical systems face harsher conditions. Standard alloys require modification to handle combined stresses from elevated temperatures, external pressures, and sour (H₂S) gas. Liaocheng Sihe is adapting our production technology to meet these requirements:
Answers to common engineering and procurement inquiries regarding coiled tubing.
Corrosion-resistant solutions designed for industrial piping networks.
Welded 316L piping configurations, offering cost-effective corrosion resistance for chemical transport.
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High-nickel alloy tubing engineered for extreme high-temperature stability and resistance to mineral acids.
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Flat-rolled 316L sheets, suitable for fabricating storage tanks and process equipment shells.
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Welded 202 pipes, suitable for automotive exhaust manifolds and structural applications.
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High-integrity heat exchanger tubing designed to meet A269 specifications for thermal systems.
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High-volume spools in various steel grades, configured for process control and instrumentation networks.
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Precision-drawn tubes designed to meet DIN standards for high-accuracy instrumentation.
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High-strength Duplex 2205 tubing in a 9.52mm x 1.24mm configuration for subsea applications.
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