Sihe Steel
Sihe Steel
Explore our foundational range of stainless steel sheets, plates, and connection components
As a leading pioneer in China's advanced metallurgical sector, Liaocheng Sihe Stainless Steel Material LTD operates six state-of-the-art production lines designed exclusively for high-integrity stainless steel coiled tubing, polishing tubes, and seamless coiled systems.
We execute strict manufacturing processes compliant with global engineering specifications including GB, ASTM, ASME, JIS, and EN standards. Our comprehensive alloy portfolio covers standard Austenitic grades (304/304L, 316L, 321, 317L, 309S, 310S), high-performance Duplex (2205 / UNS S31803), Super Duplex (2507), and premium nickel-iron-chromium superalloys (Incoloy 800, Incoloy 825, Inconel 625).
By implementing online bright annealing technology, we eliminate surface oxidation while ensuring optimal mechanical properties and microstructure uniformity. This enables our continuous tubing systems to reach lengths of up to 32,800 feet (10,000 meters) without orbital welds, drastically mitigating the risk of operational failures in demanding deepwater subsea control umbilicals and petrochemical operations.
Unmatched raw material access, advanced metallurgical processing, and global logistics efficiency
Our strategic position within China's industrial hub ensures seamless access to high-purity nickel, chromium, and molybdenum. This helps insulate our supply chains from global pricing shocks and raw material shortages.
We use protective atmosphere heat treatments (H2/N2) to achieve highly reflective internal and external surfaces. This eliminates the need for acid pickling and enhances the corrosion resistance of our tubes.
Our facility designs and manufactures single-spool, weld-free coiled lines up to 32,800 feet (10,000 meters). This reduces the need for orbital connection welds in long-distance umbilical cables.
Purchasing agents for chemical processors, offshore developers, and aerospace firms face strict compliance requirements. Liaocheng Sihe addresses these challenges by offering dual-certified alloys, detailed chemical analysis reports, and 100% non-destructive testing (NDT), including pneumatic, hydrostatic, and eddy current examinations.
Our manufacturing workflow is designed to balance mechanical performance with corrosion mitigation. For example, Duplex 2205 and Super Duplex 2507 tubing are cold-drawn and heat-treated to maintain a balanced 50:50 austenitic-ferritic microstructure. This structure provides high mechanical strength and excellent resistance to chloride-induced stress corrosion cracking (SCC).
Comprehensive metallurgical database for engineered procurement planning
| Steel / Alloy Grade | UNS Designation | Key Performance Attributes | Primary Industrial Applications |
|---|---|---|---|
| Austenitic 304 / 304L | UNS S30400 / S30403 | Excellent ductility, good general corrosion resistance, easy to weld. | Food & beverage processing, heat exchangers, general piping networks. |
| Austenitic 316 / 316L | UNS S31600 / S31603 | Enhanced resistance to chloride pitting due to molybdenum addition. | Marine fittings, chemical processing, pharmaceutical lines, oil & gas. |
| Duplex 2205 | UNS S31803 / S32205 | High yield strength, excellent resistance to stress corrosion cracking. | Desalination, chemical tankers, subsea flow lines, heat exchangers. |
| Super Duplex 2507 | UNS S32750 | PREN > 40. Outstanding resistance to pitting and crevice corrosion in seawater. | Offshore oil umbilicals, deep sea subsea equipment, marine scrubbers. |
| Incoloy 825 | UNS N08825 | Excellent resistance to both reducing and oxidizing acids. | Acid gas production, chemical handling equipment, nuclear fuel reprocessing. |
| Inconel 625 | UNS N06625 | Excellent mechanical strength at extreme temperature ranges (-250°C to 980°C). | Aerospace propulsion, turbine engines, subsea oil gas control lines. |
Proving our expertise through measurable production capacity and global footprint
Currently, 80% of our precision coil exports are shipped to demanding markets in the United States, Germany, Spain, South America, Southeast Asia, and the Middle East.
Our seamless stainless steel pipes and coiled tubes are designed for high-performance applications
Designed with uniform wall thickness to optimize thermal transfer efficiency in petrochemical systems.
Corrosion-resistant coils that prevent refrigerant leaks under high pressures.
Engineered to handle acidic process streams, high temperatures, and volatile compounds.
Electropolished, high-purity interiors that prevent contamination and bacterial growth.
Smooth-bore capillary tubing that maintains clean fluid transfer in pharmaceutical synthesis.
Super-critical boiler tubing designed to withstand high pressure-steam cycles.
Corrosion-resistant alloys (CRA) designed for sour oil reservoirs containing high levels of H2S and CO2.
High-precision hydraulic and exhaust tubing designed for high-stress aerospace environments.
We perform rigorous testing to ensure safety in demanding applications like subsea engineering and industrial processing. Every coil of pipe undergoes a comprehensive testing protocol before leaving our facility.
Our quality verification processes include:
This process reduces the risk of subsea pipe collapse and field failures, helping to lower the total cost of ownership for engineering projects.
Meeting unique engineering specifications with specialized technical processing
We process coils with outer diameters from 6.35mm to 19mm into custom configurations for compact heat exchangers and condensers.
We achieve exact dimensional control on capillary tubing, down to 0.125-inch OD, meeting precise flow control requirements.
We offer laser-cut finishes, mechanical deburring, and specialized flanging for automotive exhaust systems and chemical processing lines.
Third-party verifications and international safety standard documentation
Navigating import procedures for critical steel products requires proper documentation and compliance. We provide complete chemical composition documentation, mechanical test data, and certification matching the corresponding heat numbers.
For projects in North America, Europe, and the Middle East, we provide support with custom clearances, environmental documentation (including RoHS and REACH declarations), and localized logistical coordination. Our shipping containers are packaged to protect against oceanic salt spray corrosion, ensuring the material arrives at your facility in clean condition.
Our sales and technical teams provide support on material selection, pricing agreements, and supply contracts. Contact us to request customized sizes, specialized alloy configurations, or test reports.
Contact Technical SalesHigh-precision seamless tubing and flat-rolled alloys engineered for demanding applications
High-integrity Duplex 2205 and 316L coiled tubing designed for hydraulic lines, subsea umbilical systems, and chemical injection processes.
Ultra-thin wall, precision-drawn micro-tubing. Ideal for chromatography, diagnostic instruments, and aerospace control systems.
Bright-annealed heat exchanger pipes designed to withstand elevated pressures and prevent fouling in aggressive chemical processes.
Technical and logistical insights for global procurement agents
Explore our specialized range of seamless heat exchanger pipes and high-temperature plates
