Sihe Steel
Sihe Steel
High-precision seamless stainless steel coiled tubing and specialized industrial alloys
Standard austenitic alloy coils offering superior ductility, corrosion resistance, and structural strength for high-pressure installations.
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High-integrity titanium-stabilized sheets optimized for extreme temperature applications and structural components.
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Nickel-iron-chromium alloy tubing designed to combat severe chloride stress cracking and localized pitting.
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Low-carbon molybdenum-stabilized coiled pipes delivering elite protection in saltwater and marine chemical processing.
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High-efficiency heat exchanger piping certified for thermal conduction, high pressures, and mechanical stress.
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Elite super-duplex grade providing maximum yield strength and extreme resistance to organic acids and chloride environments.
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Designed for control line systems, downhole injection lines, and precision subsea equipment linkages.
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Specially formulated for automotive exhaust applications, thermal fatigue resistance, and structural longevity.
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In modern industrial processes, the demand for high-integrity, weld-free fluid transfer systems has grown exponentially. As global industrial processes move into deeper waters, higher temperatures, and more corrosive chemical domains, the limitations of standard welded pipes become systemic points of failure. Liaocheng Sihe Stainless Steel Material LTD manufactures high-quality seamless stainless steel coiled tubing designed to address these challenges. Our advanced production processes eliminate internal weld seams, providing a smooth interior surface, uniform wall thickness, and higher working pressures required for critical applications.
Seamless coiled tubing is a critical component in subsea engineering, chemical injection lines, hydraulic control lines, heat exchangers, and chromatography equipment. By delivering continuous lengths of up to 10,000 meters (32,800 feet) without orbital welds, our technical products reduce leakage risks and structural weaknesses associated with joints in severe offshore oil and gas environments.
Technical Benchmark: The Seamless Advantage
Unlike standard longitudinal welded tubing, seamless coiled tubes are manufactured by cold drawing or cold pilgering from a solid steel billet. This process ensures isotropic mechanical properties, higher burst pressure limits, and eliminates the risk of preferential weld-seam corrosion under high-temperature service conditions.
Understanding the chemical matrix of high-performance steel alloys and super duplex options
The performance of seamless coiled tubes in harsh environments depends directly on the alloy selected. We manufacture tubing using a wide range of materials, including standard austenitic grades, duplex systems, and nickel-based superalloys:
| Alloy Grade | Common UNS Code | Tensile Strength (MPa) | Yield Strength (MPa) | Primary Corrosion Environments |
|---|---|---|---|---|
| 304/304L | S30400 / S30403 | ≥ 485 | ≥ 170 | General atmospheres, organic acids, mild chemicals. |
| 316/316L | S31600 / S31603 | ≥ 485 | ≥ 170 | Chlorides, industrial chemicals, moderate offshore environments. |
| Duplex 2205 | S32205 / S31803 | ≥ 655 | ≥ 450 | Sour gas pipelines, seawater filtration, chemical reactors. |
| Super Duplex 2507 | S32750 | ≥ 800 | ≥ 550 | High chloride environments, heat exchangers, marine systems. |
| Incoloy 825 | N08825 | ≥ 586 | ≥ 241 | High sulfuric/phosphoric acid, deep oil and gas wells. |
A deep dive into our six production lines, dimensional ranges, and bright annealing processing
Liaocheng Sihe Stainless Steel Material LTD operates six state-of-the-art production lines, supported by advanced technology and testing equipment. Our production processes are certified to meet international standards including GB, ASTM, ASME, JIS, and EN.
Our coiled tubing is available in outer diameters ranging from 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inch (3 mm). To meet specific offshore and umbilical engineering requirements, we supply continuous, single-piece coiled tubing lengths up to 32,800 feet (10,000 meters). This avoids intermediate joints, reducing costs and risks during installation.
Supporting custom dimensions and materials (including 304, 316L, and 2205) with outer diameters from 6.35mm to 19mm, designed to exact technical specifications.
High-precision spiral forming, structural bending, and cold-drawing designed for heat exchanger installations and compact fluid loops.
Equipped with laser cutting, mechanical sawing, and automated straightening systems to ensure dimensional tolerance and finish.
Utilizing bright hydrogen annealing lines to deliver smooth, clean inside/outside surfaces and optimal ductility without the need for acid pickling.
Precision flanging processes engineered for connections in automotive exhaust assemblies, industrial chemical piping, and subsea interfaces.
Our commitment to zero-defect performance in critical high-pressure service
For applications where subsea safety, mechanical reliability, and structural life are crucial, testing processes are implemented throughout production. Our facilities carry out extensive non-destructive and mechanical tests on every batch of seamless stainless steel coiled tubing:
Our online bright hydrogen annealing process controls grain growth, softens the material, and restores structural properties to ensure stability during deepwater subsea operations.
Providing critical subsea and chemical systems across major global sectors
Optimized for thermal transfers in severe environments where fluid integrity must be maintained.
Providing flexible, clean continuous lines that prevent refrigerant leakage and withstand pressure changes.
Offering specialized alloy lines to resist corrosion from organic acids, alkalines, and sulfur compounds.
Highly polished interior surfaces prevent bacteria accumulation and meet food safety standards.
Delivering high-purity capillary tubing and coiled lines for critical fluid routing and instrumentation.
Designed for high-temperature steam systems, cooling systems, and critical sensor pipes.
Built to withstand subsea control environments, downhole instrumentation, and chemical injection systems.
Corrosion-resistant tubing for hydraulic fuel lines, exhaust systems, and high-altitude electronics protection.
ISO certified quality controls and rigorous compliance documentation for global operations
Precision stainless steel tubing products and heat exchanger solutions
Duplex 2205/2507 alloys containing austenitic and ferritic microstructures for high strength and pitting resistance.
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1/2" OD stainless steel coiled tubing in austenitic alloys, optimized for control lines and subsea equipment.
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Heat-resistant alloy tubing designed for high-temperature furnace components and heat treatment applications.
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Industrial-grade seamless tubing manufactured to ASTM standards for petrochemical, hydraulic, and process lines.
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Continuous lengths designed for downhole chemical injection, preventing joints and leakage points.
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Mechanically polished inner diameters designed to reduce fluid resistance in analyzer and chromatography systems.
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Nickel-iron-chromium coiled tubes engineered for deepwater applications and high acid exposures.
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Continuous coil systems of up to 10,000 meters for subsea control lines and umbilical bundles.
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Precision micro-bore capillary lines designed for chromatography systems, instrumentation, and sensor tubes.
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Designed for maximum thermal conductivity, mechanical strength, and pressure resistance in thermal units.
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Seamless high-pressure lines for control valves, subsea operations, and industrial machinery loops.
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Precision-engineered tubing for pressure gauges, chemical analyzers, and remote measurement control loops.
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Provides high tensile yield strength and resistance to stress corrosion cracking in chloride environments.
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Designed for downhole gas injection and chemical treatment systems in deepwater oil wells.
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Engineered to minimize surface drag and residue build-up in high-purity chemical processes.
VIEW DETAILS →Addressing technical specifications, quality standards, and logistics for procurement managers
Our pricing is based on raw material costs, size, and specification requirements. Prices are updated in response to market changes. Please contact us with your specifications (alloy grade, OD, WT, total length) for a current price list.
Yes, international orders require an ongoing minimum order quantity, which varies based on alloy grade and dimensions. For small trials or regional distribution queries, please contact our export department.
We supply standard compliance documentation, including EN 10204 3.1 Material Test Certificates (MTC), Certificates of Analysis / Conformance (COA), export customs papers, packing lists, and insurance documentation as required.
Samples are typically prepared in 7 days. For mass production runs, the standard lead time is 20-30 days after receipt of deposit payment and design approval. We will coordinate with your project timeline to meet critical delivery dates.
We accept telegraphic transfers (T/T), L/C, Western Union, and PayPal. Our standard terms are a 30% deposit in advance, with the remaining 70% balance paid against the copy of the Bill of Lading (B/L).
We provide a standard warranty covering material grade, dimensional tolerances, and manufacturing workmanship. In the event of material issues, our technical team works to resolve them to your satisfaction.
We use export-standard wooden cases, steel or wooden drums, and heavy-duty shrink wrapping to protect coiled tubing during maritime transit. Specialized packaging options are available upon request.
Shipping costs are calculated based on weight, volume, destination, and the shipping method selected. Sea freight is recommended for large volume shipments. We can provide estimated freight quotes once order details are finalized.
Key figures showing our manufacturing scale and global supply reach
Explore our specialized alloys and precise dimensional configurations
Precision-dimensioned 304 tubing designed to fit standard analytical systems and industrial cooling loops.
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Engineered for sour gas environments and high-temperature subsea control lines.
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Mechanically polished tubing designed for structural components and decorative assemblies.
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Micro-bore capillary tubing designed for fluid routing in instrumentation, medical systems, and sensor lines.
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High-integrity heat exchanger tubing designed to meet international pressure vessel codes.
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High-quality Alloy 825 tubing designed for challenging sour gas wells and high-pressure subsea control systems.
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Low-carbon 304L alloy designed to prevent carbide precipitation during welding and high-temperature exposure.
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Precision-drawn 201 tubing designed for general structural use, mechanical parts, and automotive components.
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