Sihe Steel
Sihe Steel
High-precision stainless steel coiled tubes, capillary tubes, and custom alloys developed for demanding environments.
Super-austenitic stainless steel engineered for harsh phosphoric and sulfuric acid environments. Exceptional resistance to pitting and crevice corrosion.
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Ultra-precision capillary tubing designed for analytical instruments, medical devices, and automated liquid delivery systems.
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Nickel-iron-chromium alloy featuring titanium stabilization. Ideal for offshore gas wells, chemical processing, and heat exchangers.
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Low carbon marine-grade stainless steel coils. Unmatched resistance to chloride-induced stress corrosion cracking in high-temperature subsea umbilicals.
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Heavy-duty structural coiled tubing tailored for deep-well downhole injection lines, chemical dosage, and monitoring cables.
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High-specification structural grade plates used in vessel cladding, storage tanks, and heavy industrial chemical machinery.
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Welded heat exchanger and condenser tubes. Designed with strict wall-thickness control for superior heat transfer efficiency.
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Standard marine-grade stainless coiled tubes. Widely requested across hydraulic systems, industrial coolers, and instrumentation networks.
Get PricelistAuthoritative analysis of market shifts, material science breakthroughs, and quality control paradigms in high-performance metallurgy.
The global demand for high-integrity stainless steel pipes is rapidly shifting toward deepwater exploration and aggressive chemical processes. Standard alloys are being replaced by duplex (2205), super duplex (2507), and nickel-based superalloys (Inconel 625, Incoloy 825). These materials are vital for modern operations that function under extreme temperatures and pressures, mitigating downtime caused by localized galvanic reactions, pitting, and stress corrosion cracking.
Procurement executives in Europe, the Americas, and Southeast Asia require strict compliance with international manufacturing benchmarks. Every batch must align with ASTM, ASME, GB, JIS, and EN standards. Quality certification involves third-party verification, heat treatment validation (Bright Annealing), and rigorous non-destructive testing (NDT), such as hydrostatic pressure checks and eddy current analysis, ensuring safety across offshore and aerospace operations.
Continuous, single-length coiled tubing up to 10,000 meters (32,800 feet) eliminates orbital welds. This single-piece design is critical for hydraulic lines, subsea umbilical systems, downhole injection lines, and high-pressure analytical instrument networks. Minimizing connection joints reduces mechanical failure risks, improves overall hydraulic transmission efficiency, and supports complex installation setups.
A certified leader in metallurgy, supplying the global energy, chemical, and precision engineering sectors for over a decade.
Liaocheng Sihe Stainless Steel Material LTD is a premium manufacturer specialized in high-performance stainless steel coiled tubes, capillary tubes, and heat exchanger pipes. With six state-of-the-art production lines, we produce components that strictly meet GB, ASTM, ASME, JIS, and EN standards. Our extensive steel grades cover 304/304L, 316L, 321, 317L, 309S, 310S, and high-integrity specialty alloys including Incoloy 800, Incoloy 825, Inconel 625, Duplex 2205, and Super Duplex 2507.
Our coiled tubing solutions are available in 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 mm). To facilitate deepwater operations, we deliver continuous coils up to 10,000 meters (32,800 feet), providing structural integrity for umbilical cable manufacturing.
Providing critical components for high-stress systems, deepwater operations, and precision machinery.
Precision-bent tubes with clean inner diameters, optimizing thermal transfer in power generation and petrochemical systems.
Corrosion-resistant copper-nickel and stainless steel cooling coils designed for industrial chillers and climate control units.
Alloy 825 and 316L tubing built to withstand exposure to aggressive chemical compounds, acids, and high temperatures.
Electropolished interior profiles preventing microbial buildup, meeting strict sanitary processing criteria.
Ultra-clean, high-purity capillary lines ensuring zero contamination for pharmaceutical and bio-diagnostic systems.
High-pressure superheater and steam pipe networks configured to operate reliably at elevated temperatures.
Downhole hydraulic lines and control systems optimized for sour gas environments containing high levels of H2S and CO2.
Lightweight, high-strength hydraulic control tubing designed for hydraulic actuators and aircraft fuel lines.
Our facility offers integrated processing services, transforming raw tubing into production-ready assemblies.
We customize a wide range of materials (including 304, 316L, 2205, and nickel alloys) with outer diameters ranging from 6.35 mm to 19 mm, tailored to specific project requirements.
Our forming capabilities include high-precision bending, continuous spiral coiling, and cold drawing, providing tailored configurations for compact heat exchangers.
We provide precise mechanical, laser, and flame-cutting services, ensuring minimal dimensional deviation and clean, burr-free ends.
We offer bright annealing, pickling, mechanical polishing, and electropolishing (EP) to achieve desired surface roughness and enhanced corrosion resistance.
We supply high-precision flanged ends, swaging, and expansion processing, ensuring leak-free connections in automotive exhaust and chemical feed lines.
Every batch undergoes rigorous quality controls, including hydrostatic, pneumatic, eddy current, tensile, and microstructure analysis.
A guide to selecting the appropriate chemical composition based on operating environments.
| Steel Grade / Alloy | Main Alloying Elements | Primary Mechanical Advantages | Target Application Environments |
|---|---|---|---|
| Austenitic 304/304L | 18% Cr, 8% Ni | Excellent ductility, ease of forming | HVAC, cooling coils, food processing |
| Austenitic 316/316L | 16% Cr, 10% Ni, 2% Mo | Enhanced resistance to chloride pitting | Marine hardware, chemical injection |
| Duplex 2205 | 22% Cr, 5% Ni, 3% Mo, 0.18% N | High yield strength, low thermal expansion | Oil & gas umbilicals, marine heat exchangers |
| Alloy 825 | 42% Ni, 21% Cr, 1.5% Cu, Balance Fe | Excellent resistance to stress corrosion cracking | Acid production, deepwater gas wells |
| Inconel 625 | 61% Ni, 22% Cr, 9% Mo, 3.6% Nb | High fatigue strength, high-temperature stability | Aerospace, deep-sea subsea systems |
Our products conform to major international design codes, supported by rigorous quality testing documentation.
To ensure reliability in critical applications, our inspection laboratory carries out regular physical and metallurgical tests. We perform hydrostatic tests at designated design pressures to verify structural integrity, alongside online eddy current testing to detect micro-cracks or surface imperfections.
Every shipment is delivered with a complete documentation package, including Material Test Reports (MTR) to EN 10204 3.1, raw material origin tracking, heat treatment records, and non-destructive testing (NDT) results.
Explore our primary product lines, engineered for compatibility with modern industrial processing layouts.
Available in seamless and welded options, designed for high-pressure control lines and subsea configurations.
Ultra-small diameter tubes with tight tolerances, suited for chromatography, high-pressure liquid systems, and medical diagnostics.
Configured to withstand extreme heat and cyclic thermal loads, ensuring long-term reliability in energy systems.
Driving metallurgical innovations to meet the demands of tomorrow's energy systems.
Industrial requirements are evolving rapidly, particularly with the growth of green hydrogen transport and high-pressure carbon capture systems (CCUS). Traditional stainless steel alloys can suffer from hydrogen embrittlement when exposed to high-pressure gas. In response, our research focuses on optimizing nickel-equivalent formulations and stabilizing grain boundaries in austenitic steels.
By adjusting nitrogen additions in duplex alloys, we improve both overall material strength and resistance to stress corrosion cracking, helping reduce system weight in marine applications.
Additionally, our manufacturing team is updating our bright annealing technology. Introducing smart temperature-profile monitors helps prevent carbon precipitation along grain boundaries, ensuring consistent mechanical properties across every meter of our coiled tubing.
Find answers to common questions about our technical specifications, ordering processes, and shipping terms.
Select from our range of corrosion-resistant, high-temperature tubing options designed for demanding industrial settings.
Precision-drawn capillary tubes offering high resistance to pitting and corrosion, suited for marine sensors and laboratory analytical equipment.
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Custom-bent cooling loops configured for high thermal efficiency in beer breweries, beverage lines, and refrigeration systems.
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Combining high tensile strength with corrosion resistance. Designed for offshore control valves, subsea chemical systems, and sensors.
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Long continuous coil tubing manufactured for subsea umbilical systems, downhole injection, and high-pressure chemical dosing lines.
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Martensitic stainless steel tubing offering high hardness, wear resistance, and mild corrosion protection. Designed for mechanical parts.
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High-temperature heat-resistant tubing designed to resist oxidation in heating systems, furnaces, and thermal plants.
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High-performance nickel-chromium alloy designed for extreme pressure and chemical exposure in downhole and marine environments.
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High-precision 304 grade coiled tubes meeting DIN manufacturing tolerances for automotive fuel injection and control lines.
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