Sihe Steel
Sihe Steel
Engineered to withstand intense mechanical loads, high temperatures, and chemical exposure. Browse our primary product configurations.
How Modern Engineering Demands Seamless, Continuous-Run Alloy Tubing to Bypass High-Stress Welded Connections.
In modern industrial fluid networks and control environments, the transition from traditional straight line joints to continuous stainless steel coiled tubing represents a significant architectural leap. Weld points are traditionally the weakest spots within high-pressure pipelines. By utilizing seamless coil tube technologies, global heavy industries—including petroleum extraction, pharmaceutical biotechnology, and marine logistics—greatly reduce the potential risk of failure points, streamlining field installation processes and preventing costly fluid leakage.
The global demand for high-strength alloys like AISI 304, AISI 316L, and Duplex 2205 has surged as deep offshore exploratory wells push physical pressure limits. System designers operate in hostile environments requiring corrosion resistance, precise wall-thickness tolerances, and extreme ductility. Standard structural specifications require products that withstand extreme temperature transitions while containing highly volatile media under extreme pressures. As a prominent Chinese manufacturer, Liaocheng Sihe Stainless Steel Material LTD leverages over ten years of metallurgy engineering history to deliver highly certified solutions globally.
Continuous runs of up to 32,800 feet (10,000 meters) eliminate intermediate orbital welding, removing structural hot spots and leak vulnerabilities.
Designed specifically for multi-axis CNC bending systems, coiled lines retain internal integrity during complex mechanical bends.
Specialized chemical composition with elevated Nickel (Ni) and Chromium (Cr) profiles ensures active passivation in salty marine and acid environments.
Leveraging six high-efficiency cold-drawing and bright annealing lines to deliver standardized and customized solutions globally.
Based in China, Liaocheng Sihe specializes in manufacturing premium stainless steel coiled tubing, precision polishing tubes, and seamless long pipelines. We maintain high standards of testing across all steps. By conforming to global industrial specifications (including GB, ASTM, ASME, JIS, and EN standards), we serve various industrial sectors.
Our materials inventory includes 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Austenitic Steel 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625. Our coiled tubes are available in sizes ranging from an outer diameter of 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inch (3 mm). To optimize costs and run times, we supply single, continuous lengths up to 32,800 feet (10,000 meters), ideal for umbilical fabrication.
Delivering high-reliability tubing systems for critical infrastructure and demanding industrial operations.
Deepwater oil and gas operations face harsh external pressures and internal corrosive flows. Our long, joint-free coiled tubing is utilized in hydraulic control bundles, chemical injection channels, and communications umbilicals linking surface platforms to subsea installations.
In sterile manufacturing, contamination must be completely avoided. Our bright-annealed tubes feature ultra-smooth inner surfaces (ID) that prevent microbial adhesion and particulate buildup, helping systems conform to ASME BPE sanitization requirements.
Optimizing thermal exchange cycles requires materials with high thermal conductivity and thin, uniform walls. Our 304 and 316L coiled structures are designed for geothermal loops, cryogenic cooling networks, and industrial condenser units.
Every batch of stainless steel coiled tubing undergoes rigorous processing, tracking, and certification to match global quality standards.
| Steel Grade Category | Available OD Range (inch / mm) | Wall Thickness Max (inch / mm) | Standards Conformity | Key Testing Benchmarks |
|---|---|---|---|---|
| Austenitic (304, 304L, 316, 316L, 321, 317L, 310S) | 0.125" – 1.0" (3.175mm – 25.4mm) | Up to 0.165" (3.0mm) | ASTM A269, ASTM A249, GB/T 14976, EN 10216-5 | Hydrostatic, Flaring, Bending, Hardness 100%, Eddy Current |
| Duplex & Super Duplex (2205, 2507) | 0.250" – 0.75" (6.35mm – 19.05mm) | Up to 0.120" (2.11mm) | ASTM A789, ASTM A790, API 5LC | Tensile, Yield, Hardness, Microstructure Analysis |
| High Nickel Alloys (800, 825, 625) | 0.125" – 0.50" (3.175mm – 12.7mm) | Up to 0.083" (2.11mm) | ASTM B163, ASTM B423, ASTM B444 | Corrosion testing, Air Tightness, Positive Material ID (PMI) |
Our quality assurance program is built around several key steps:
Tailoring our production processes to match your precise engineering specifications.
We support various materials (e.g., 304, 316L, 2205) and custom specifications, covering diameters from 6.35mm to 19mm for stainless steel coils.
Includes bending, spiral forming, precision drawing, and other specialized configurations tailored for high-efficiency heat exchangers.
Laser cutting, mechanical cutting, or flame cutting options to achieve tight length tolerances and clean edges.
Continuous updates to our polishing and chemical passivation processes to meet demands for clean inner surfaces.
Automated end preparation for automotive exhaust systems, chemical pipelines, and precision instrument connections.
Where our coiled tubing systems are integrated to ensure reliable performance under extreme conditions.
Looking ahead at precision-engineered alloys, carbon reduction initiatives, and extreme-reach technologies.
The next generation of infrastructure requires coiled piping to perform in challenging environments. Deepwater extraction, high-pressure hydrogen transport, and advanced chemical processes require improvements in structural integrity and metallurgy.
Our technical roadmap focuses on three main developments:
Our production quality is backed by international certifications and strict testing guidelines.
Technical guidance and commercial support for purchasing and installing coiled tubing.
Explore our core product lines manufactured to meet global industrial standards.
Featuring duplex and austenitic alloys designed to reduce leak risks in high-vibration systems.
Standard 1/2-inch coils engineered for instrument hookups, chemical injection, and hydraulic controls.
High-temperature resistant coils designed for heat treat furnaces and severe exhaust ducts.
Drawn tubes with tight dimensional tolerances, suitable for chromatographic equipment.
Supplied in continuous coils up to 10,000 meters to minimize fitting requirements.
Optimized for hydraulic valves and subsea safety systems.
Features 2205 duplex structure for high pitting resistance in marine environments.
High-nickel configurations for severe chemical processing environments.
Drawn and polished coils designed for food, beverage, and dairy systems.
Formed to handle thermal expansion cycles in vehicle exhaust systems.
Pre-wound spiral lines designed for condenser units and cooling processes.
Designed for high-pressure gas distribution and laboratory analytical systems.
Durable coils designed for heavy industrial hydraulic fluid control.
Explore our wider range of sheets, plates, and precision welded pipes.
