Sihe Steel
Sihe Steel
Explore our highly specified product range manufactured under ISO 9001 guidelines with complete traceability
Analyzing metallurgical integrity, dimensional tolerances, and high-performance applications
In high-pressure, cryogenic, and corrosive environments, the structural integrity of fluid and gas delivery networks is paramount. Stainless steel seamless capillary tubing represents the pinnacle of micro-dimensional extrusion technology. By eliminating the longitudinal weld seam, these tubes possess uniform grain structures that prevent localized corrosion, handle higher working pressures, and ensure seamless internal flow characteristics. For critical instrumentation, chromatography, and aerospace control lines, seamless execution is a non-negotiable requirement.
At Liaocheng Sihe Stainless Steel Material LTD, we engineer high-precision capillary solutions across a vast metallurgical spectrum. Our production capabilities span outer diameters 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 employing specialized cold drawing and precision pilgering methods, we achieve extremely tight tolerances on both the OD and ID, which are critical for gas chromatographs and analytical instruments where flow rate deviation must be kept under 0.5%.
Our long-length continuous coiled tubing technology eliminates intermediate orbital joints. We deliver continuous coil lengths of up to 32,800 feet (10,000 meters). This drastically reduces installation time and minimizes leakage risks in subsea umbilicals, geothermal heat exchangers, and chemical processing facilities. Supported standards include ASTM A269, ASTM A213, ASME, JIS, and EN, guaranteeing compliance with global engineering frameworks.
| Material Category | Common Steel Grades | Key Properties | Target Applications |
|---|---|---|---|
| Austenitic Alloys | 304/304L, 316L, 321, 317L, 309S, 310S | Excellent corrosion resistance, high ductility, non-magnetic in annealed state. | Analytical instruments, food & beverage processing, medical devices, HVAC condensers. |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | High yield strength, supreme resistance to stress corrosion cracking (SCC) & pitting. | Subsea umbilical lines, marine environments, offshore petroleum extraction. |
| Nickel Alloys | Incoloy 800, Incoloy 825, Inconel 625 | Excellent thermal stability, oxidation resistance, high structural strength under thermal shock. | Chemical reactors, boiler systems, geothermal exploration, aerospace propulsion. |
A premier Chinese manufacturing force with a decade of global supply history
Founded on the principles of metallurgical precision and operational transparency, Liaocheng Sihe Stainless Steel Material LTD is a leading expert in the field of stainless steel coiled tubes, stainless steel polishing tubes, and stainless steel seamless coiled tubing. Armed with six advanced production lines and a highly specialized metallurgical testing facility, we execute production standards (GB, ASTM, ASME, JIS, EN) with absolute rigidity.
We boast a decade-long history of manufacturing and direct-to-enterprise exporting, sending high-precision alloy tubes to over 30 countries across the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe. To optimize the mechanical performance of our tubing, we have integrated world-class online bright annealing technology, which executes protective atmosphere heat treatment (hydrogen-nitrogen mix) to keep the internal tube surfaces perfectly clean, smooth, and scale-free.
Why global enterprises choose Liaocheng Sihe as their primary OEM partner
By executing billet sourcing, cold drawing, online bright annealing, and multi-stage testing in-house, we control quality margins and eliminate distributor markups. Our direct control over raw materials ensures stable batch-to-batch chemical properties.
We mitigate risks of subsea and high-pressure failures by running 100% mechanical tests. Every order is backed by material certificate of analysis (MTR) showing chemical compositions, yield strength, elongation, flaring capacity, and air tightness.
Located near major Chinese maritime shipping corridors, we utilize streamlined packaging systems and experienced custom brokers to accelerate international transit. Our standard sample turnaround is just 7 days, and batch fabrication finishes in 20-30 days.
Deciphering price indexes, raw materials, and compliance for overseas buyers
Purchasing precision-engineered alloy components involves complex commercial variables. When sourcing stainless steel seamless capillary tubes, buyers must analyze more than just the base price per meter or foot. Price volatility in alloy elements like Nickel (Ni), Chromium (Cr), and Molybdenum (Mo) has a direct impact on the cost of duplex grades like UNS S32205 (Duplex 2205) and super duplex UNS S32750 (2507). Procurement departments must synchronize contracts with the London Metal Exchange (LME) index fluctuations to secure cost-efficient agreements.
Another major pricing driver is dimensional precision. Thin-walled capillaries require multiple cold-drawing passes and vacuum annealing treatments to achieve desired tensile strengths. These extra steps raise manufacturing costs relative to standard commercial pipes. To manage this, our engineering team recommends aligning with OEM standard dimensions where possible, or optimizing ordering schedules to meet container volume targets, which offset maritime freight costs.
Additionally, importing nations enforce strict compliance regulations. In Europe and North America, critical industrial applications must satisfy PED (Pressure Equipment Directive) and ASME Section III guidelines. Choosing a supplier that provides verified EN 10204 3.1 certification and complete heat code traceability ensures smooth customs clearance and prevents expensive delays at port borders.
How our capillary products function in harsh operational environments around the globe
Subsea Chemical Injection Systems: In the North Sea offshore oil industry, chemical injection systems operate under extreme pressure and corrosive seawater conditions. Our Duplex 2205 and Super Duplex 2507 capillary lines deliver corrosion inhibitors directly to downhole valves, providing excellent pitting resistance (PREN > 40) to prevent failures.
Chromatography & Biotech: Laboratories in Germany and the US rely on our ultra-precise 316L capillary tubes for high-performance liquid chromatography (HPLC). A smooth inner diameter is essential to prevent sample absorption and carryover, ensuring highly accurate analytical measurements.
Aerospace Hydraulic Lines: High-performance aviation hydraulic networks operate under continuous pressure pulses and vibrations. Utilizing ASTM A269 stabilized 321H grade capillaries ensures excellent creep strength and structural reliability at operating temperatures up to 800°C.
Value-added manufacturing steps tailored to specific system configurations
Verifiable metallurgical credentials demonstrating industry compliance
To operate in sectors like aerospace, energy exploration, and pharmaceutical processing, materials must comply with strict international regulatory bodies. Our manufacturing lines run under an ISO 9001:2015 quality management system, and our products meet major European and American specifications. Every batch of tubing undergoes rigorous quality control checks before leaving the factory.
Clear, transparent answers to help streamline your purchasing and logistics planning
Navigate through our primary metallurgical product lines
2205 stainless steel is a duplex stainless steel containing austenitic and ferritic phases, offering excellent strength and resistance to SCC.
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1/2 stainless steel coiled tubing refers to a high-pressure coil design used widely for hydraulic control lines and instrument links.
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China 310 Steel Coil Tube Factories produce high-temperature oxidation resistant lines ideal for petrochemical combustion zones.
VIEW MORE PRODUCTExplore our specialized alloys, duplex lines, and high-performance tubing solutions
