Sihe Steel
Sihe Steel
Explore our diverse collection of high-performance tubes, plates, and heat exchanger components designed for strict compliance with global industrial standards.
Welcome to Liaocheng sihe stainless steel material LTD, a premier manufacturer based in China. Operating six advanced production lines, we specialize in high-precision stainless steel coiled capillary tubes, polishing tubes, and seamless coiled tubing designed to exceed the expectations of modern industrial design projects.
We execute strict process controls matching standard certifications such as GB, ASTM, ASME, JIS, and EN. Our metallurgical footprint covers basic austenitics to highly demanding super duplex and nickel-based superalloys: 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
Our coiled tubes are engineered to support major demands, with outer diameters scaling from 0.125 inch (3.175 mm) up to 1 inch (25.4 mm), and wall thicknesses extending up to 0.165 inch (3 mm). To facilitate continuous control lines and complex umbilical structures without orbital weld points, we deliver continuous single lengths up to 32,800 feet (10,000 meters).
Selecting the optimal alloy configuration is essential for mitigating risks such as chloride stress corrosion cracking (SCC), localized pitting, and high-pressure burst failures in critical flowlines.
In deep offshore oil and gas extractions, capillary tubes are exposed to highly corrosive sour gas, high temperatures, and immense external pressures. Under these conditions, standard grades often face severe limitations. Our engineering team utilizes advanced metallurgical selection protocols to guarantee long-term performance:
| Alloy Grade | UNS Number | Nickel (Ni) % | Chromium (Cr) % | Molybdenum (Mo) % | Key Application Characteristics |
|---|---|---|---|---|---|
| 316L | S31603 | 10.0 - 14.0 | 16.0 - 18.0 | 2.0 - 3.0 | Standard marine, pharmaceutical, and bio-tech instrumentation. |
| Duplex 2205 | S32205 | 4.5 - 6.5 | 22.0 - 23.0 | 3.0 - 3.5 | High strength, excellent SCC resistance, marine control lines. |
| Incoloy 825 | N08825 | 38.0 - 46.0 | 19.5 - 23.5 | 2.5 - 3.5 | Exceptional resistance to sulfuric and phosphoric acids; downhole injection. |
| Inconel 625 | N06625 | 58.0 min | 20.0 - 23.0 | 8.0 - 10.0 | Extreme temperatures, high chloride environments, subsea umbilical components. |
How we achieve high precision, zero defect density, and clean interior surfaces for ultra-long continuous coiled lines.
Liaocheng Sihe utilizes advanced online bright annealing technology to process capillary tubes continuously. The protective atmosphere (dry hydrogen with a dew point below -50°C) ensures that the inner and outer surfaces remain bright, clean, and completely free of oxidation or scaling. This treatment relieves cold-working stresses, optimizing ductility for subsequent bending, flaring, or spiral forming operations.
Our commitment to E-E-A-T and global quality control is backed by standard diagnostic testing across 100% of our products:
Inline electromagnetic detection verifies wall consistency and identifies internal structural anomalies along the entire length of the tube.
Every coil undergoes high-pressure fluid testing (up to 1,000 bar depending on dimensions) to verify mechanical burst resistance.
Pneumatic tests check for microscopic gas leaks, ensuring leak-free performance in vacuum and high-purity gas delivery systems.
Standard flaring, bending, tensile strength, and 100% hardness tests verify that the material matches ASME and ASTM requirements.
We offer custom-engineered processing to adapt our high-precision coils to your mechanical assemblies.
Precision bending and spiral forming services, creating highly compact heat exchanger coils, cooling jackets, and heating elements tailored to custom dimensional constraints.
Flanging, mechanical swaging, and laser orbital cutting to ensure square, burr-free tube ends, facilitating seamless integration with compression fittings and orbital welding systems.
Mechanical and chemical inner diameter (ID) polishing to limit roughness (down to Ra < 0.4 μm) for applications requiring zero fluid entrapment and high flow rates.
Our coiled stainless steel capillary products serve demanding industrial, energy, and scientific instrumentation applications worldwide.
Compact, high-pressure coils that optimize thermal transfer in petrochemical, process heating, and cooling systems.
Highly forming-capable, oxidation-free tubes designed for refrigeration expansion loops and heat pump systems.
Corrosion-resistant flow paths handling aggressive acids and solvents at elevated temperatures.
FDA-compliant, highly polished inner surfaces that prevent bacterial colonization and contamination.
Strictly clean, passive inner walls designed for liquid chromatography and bioreactor dosing lines.
Durable, thick-walled steam-sampling capillary systems designed for continuous utility monitoring.
High-strength alloy systems designed for downhole chemical injection in offshore production wells.
High mechanical reliability under vibration for hydraulic control lines, fuel injectors, and structural feeds.
Our commitment to global standards is validated by strict material certifications, quality management audits, and traceability documentation.
Why global procurement teams choose direct integration with Liaocheng Sihe's automated production infrastructure.
In today's challenging industrial supply chain landscape, global procurement teams require predictability in lead times, transparent material sourcing, and consistent quality compliance. Operating as a direct factory, Liaocheng Sihe removes the complexities associated with trading intermediaries:
Browse our primary product groups, designed to support high-pressure applications and critical flow paths.
Seamless coils in 316L, 2205, and nickel alloys, designed for hydraulic control lines and marine umbilicals.
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Ultra-fine capillary tubes with outer diameters starting at 0.125 inch, designed for chromatographs and instruments.
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Highly thermal-conductive, oxidation-resistant heat exchanger tubes built for power plant condensers and boilers.
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Answers to common questions regarding specifications, logistics, minimum orders, and customized quotes.
Discover our wider product range, featuring specialized corrosion-resistant sheets and advanced alloy lines.
