Sihe Steel
Sihe Steel
Explore our elite range of corrosion-resistant capillary tubes, high-pressure duplex coiled tubing, and decorative sheets, configured directly from China's leading manufacturing line.
Analyzing metallurgical demands across high-integrity industries: offshore operations, deep-well hydrocarbon extractions, and extreme-purity fabrication sectors.
The global steel industry is experiencing a profound transition, driven by the escalating severity of operating parameters in marine engineering, green hydrogen production, and pharmaceutical synthesis. Standard austenitic grades like AISI 304 and 316, while remaining foundation blocks for structural work, are increasingly being superseded by Duplex 2205, Super Duplex 2507, and Nickel-Chromium-Molybdenum alloys (such as Inconel 625 and Incoloy 825). These advanced compositions address critical vulnerabilities to chloride-induced stress corrosion cracking (SCC), localized pitting, and crevice oxidation in sour environments containing carbon dioxide (CO2) and hydrogen sulfide (H2S).
For modern subsea engineering systems, the adoption of continuous coiled umbilical tubing has revolutionized control line distribution. System integration engineers require continuous, seamless lengths that span up to 32,800 feet (10,000 meters) without orbital welding joints, which traditionally represent structural failure zones. The engineering focus is transitioning away from commodity procurement toward value-driven metallurgical sourcing, evaluating total system life expectancy against severe wear and high pressure. Minimizing hydraulic fluid contamination and ensuring micro-tolerance profiles are paramount to operational longevity.
Based in China, Liaocheng Sihe Stainless Steel Material LTD is a world-class manufacturer specializing in the advanced production of high-performance stainless steel coiled tubes, capillary lines, and high-precision heat exchanger pipes. Operating six advanced production lines and integrating state-of-the-art bright annealing lines, we adhere strictly to premium domestic and global standards including GB, ASTM, ASME, JIS, and EN.
Our material portfolio is meticulously engineered to support the most challenging operational profiles. We offer a comprehensive suite of alloys:
Austenitic Grades: 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800.
Super Alloys & Duplex: Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
With over ten years of specialized manufacturing experience, our team guarantees unmatched concentricity, surface smoothness, and mechanical reliability. Eighty percent of our export inventory supplies critical projects across the United States, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
| Feature / Parameter | Imperial Specification Range | Metric Specification Range |
|---|---|---|
| Outer Diameter (OD) | 0.125 inch to 1.000 inch | 3.175 mm to 25.40 mm |
| Wall Thickness (WT) | Up to 0.165 inch | Up to 3.00 mm |
| Continuous Coil Length | Up to 32,800 feet | Up to 10,000 meters |
| Applicable Standards | GB, ASTM (A269, A213, A789), ASME, JIS (SUS202, SUS304, etc.), EN | |
| Surface Finishing | Bright Annealed (BA), Electrolytic Polished (EP), Ground Finish | |
For global EPC contractors and procurement managers, managing the total cost of ownership (TCO) in stainless steel coiled tubing procurement is highly complex. The challenges involve minimizing ocean freight transit damage, securing clear export documentation, and verifying material traceability back to the casting charge.
Liaocheng Sihe has designed a complete logistics framework to handle these risks. Our coiled tubing is packaged using high-integrity wood or metal drums, wrapped with anti-corrosive plastic films and structural crating, safeguarding coils from salt-spray exposure. Additionally, we provide full testing reports with each shipment, containing trace analysis of primary metals, mechanical tensile profiles, and ASTM/ASME conformity markers.
Delivering optimized metallurgical components configured for the demanding environments of modern industrial sub-sectors.
Handling pressures up to 15,000 psi in ultra-deep water setups. Our Super Duplex 2507 and Incoloy 825 coiled lines are key components in high-pressure subsea control assemblies and chemical injection lines.
For ultra-high purity gas distribution. We offer 316L and 316L VIM-VAR capillary tubes featuring ultra-smooth internal surfaces, ensuring low outgassing and particle-free gas delivery.
Excellent heat transfer rates for aggressive industrial environments. Our coiled heat exchanger tubes are manufactured from corrosion-resistant duplex steel to resist chloride pitting.
Advanced post-drawing processing capabilities engineered to convert bulk coiled tubing into custom, installation-ready system configurations.
We work with various grades (such as 304, 316L, 2205) and adjust external diameters from 6.35mm to 19mm to align with custom specifications.
Includes high-precision bending, tight-radius spiral coil shaping, and custom continuous drawn profiles optimized for advanced industrial heat exchangers.
Utilizing high-grade laser cutting, automatic mechanical cutting, or specialized flame cutting systems to ensure flat end surfaces and close length tolerances.
We support various finishes, including acid pickling, bright annealing, mechanical polishing, and electro-polishing for high-purity systems.
End forming and flanging designed for secure integration into automotive exhaust loops, chemical transport lines, and high-vibration instrument systems.
Custom solutions engineered to perform reliably under demanding field conditions across diverse heavy industries.
Duplex 2205 alloy mixes austenitic and ferritic structures, offering exceptional resistance to chloride-induced stress corrosion.
Our 1/2" coiled stainless steel tubing options provide high flexibility for reliable high-pressure instrument routing.
Manufactured directly in local production facilities, these 310 grade tubes are designed to resist oxidation in high-temperature environments.
Our 100% inspection guarantee ensures zero structural defects across all seamless coiled tubing configurations.
At Liaocheng Sihe, quality assurance is integrated into every step of our manufacturing. We utilize premium-grade raw steel billeted under verified batch numbers to guarantee full trace transparency. Our production lines feature an advanced Bright Annealing system. This system performs online heat treatment of the stainless steel tubing under a controlled gas atmosphere, yielding a scale-free, mirror-bright surface finish with uniform hardness.
Our quality checks include a comprehensive suite of mechanical and non-destructive evaluations to verify integrity before shipment:
Each coil is pressurized to confirm structural integrity, matching design parameters for subsea operations.
Online inspection to detect internal and external micro-voids or inconsistencies in the tubing walls.
Verifying flexibility and physical properties, including 100% tensile verification and drift expansion testing.
Confirms uniform material hardness and ensures leak-free performance under continuous gas pressures.
Advancing production capabilities to meet the carbon-neutral and hydrogen-based manufacturing requirements of tomorrow.
As industrial processing shifts toward green hydrogen and ultra-high purity media, metal piping must satisfy strict criteria to prevent hydrogen embrittlement. Liaocheng Sihe is investing in research to optimize nickel-based superalloys (such as Inconel 625 and Hastelloy grades) to improve fatigue resistance under high cyclic pressures. Our engineering team is currently testing next-generation drawing techniques designed to lower inner diameter roughness (Ra) values to below 0.25μm, minimizing physical resistance in precise micro-fluidic loops.
Additionally, we are focusing on reducing our carbon footprint. By integrating efficient energy recovery systems into our bright annealing lines and upgrading our raw material sourcing practices, we aim to deliver high-quality, high-reliability products that help our customers meet their environmental goals.
Get detailed technical answers regarding pricing structures, raw material options, custom processing capabilities, and order logistics.
Discover more high-performance seamless coiled tubing options, precision capillary pipes, and industrial-grade alloys.
