Sihe Steel
Sihe Steel
Stainless Steel 316L (UNS S31603) represents the pinnacle of austenitic alloys engineered for high-durability subsea, chemical, and industrial piping. By limiting the carbon footprint to a maximum of 0.03%, 316L effectively eliminates the risk of carbide precipitation during processes such as orbital welding. The presence of 2.0% to 3.0% Molybdenum significantly increases resistance to localized pitting and crevice corrosion compared to traditional 304 grades.
The Pitting Resistance Equivalent Number (PREN) formula: PREN = %Cr + 3.3%Mo + 16%N yields a robust range of 23 to 25 for 316L. This metric guarantees exceptional stability under continuous exposure to acidic, chloride-rich, and maritime environments. Our coiled tubing undergoes advanced metallurgical optimization to consistently deliver this performance baseline, making it the preferred choice for umbilical lines, downhole control lines, and chemical injection systems.
Liaocheng Sihe Stainless Steel Material LTD utilizes advanced bright annealing (BA) furnace networks. By processing the material within a controlled, high-purity hydrogen atmosphere at temperatures exceeding 1040°C, we achieve absolute recrystallization without oxidation. This eliminates the necessity for chemical pickling, maintaining a highly reflective, ultra-smooth inside diameter (ID) and outside diameter (OD).
Our commitment to reliability includes comprehensive testing protocols:
We supply continuous coiled tubing lengths up to 32,800 feet (10,000 meters) per spool. Eliminating intermediate orbital welds minimizes potential leak paths, optimizes flow dynamics, and streamlines field installation in umbilical bundle manufacturing.
Operating from Liaocheng, China's premier industrial hub for high-precision metallurgical alloys, Liaocheng Sihe Stainless Steel Material LTD runs six advanced production lines. This centralized manufacturing infrastructure ensures vertical integration from raw steel billets to finished, packed coiled spools. By managing the entire supply chain locally, we bypass intermediate markups, offering direct factory pricing without compromising on quality.
Our strategic proximity to major ports (such as Qingdao Port) ensures simplified logistics and predictable shipping timelines to the US, Germany, Spain, and more than 30 other countries worldwide. Our production capability covers outer diameters from 0.125 inches (3.175 mm) to 1 inch (25.4 mm), with custom configurations available to match specialized project requirements.
Our products are engineered to align with local codes in Europe, the Americas, and the Asia-Pacific region. Every batch is certified under EN 10204 3.1, providing full material traceability. We manufacture in strict accordance with ASTM, ASME, JIS, and EN standards to guarantee compliance with regional regulatory boards, including PED (Pressure Equipment Directive) in the European Union and ASME boiler codes in North America.
EPC contractors and procurement divisions prioritize predictability. Our manufacturing workflow supports critical project demands: custom reel dimensions, specialized export packaging, long-term price hedging against nickel volatility, and dedicated port logistics. We assist technical buyers by providing extensive engineering submittal packages, MTRs (Mill Test Reports), and dimensional tolerance verification before dispatch.
The industry is transitioning toward longer subsea step-outs and higher pressure limits. As oil and gas exploration expands into deeper waters, the demand for corrosion-resistant alloys (CRAs) like Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625 is increasing. Liaocheng Sihe is positioned for this shift, providing dual-certified 316/316L coiled tubes and exotic superalloys tailored for extreme operating environments.
Beyond high-quality raw tube drawing, we supply value-added custom processing to minimize fabrication times at your facility.
We provide custom structural bending and spiral winding services, delivering ready-to-install coils tailored to the housing configurations of your industrial heat exchangers and cooling systems.
Utilizing high-precision laser and mechanical cutting, we deliver precise length cuts with deburred, clean ends ready for orbital welding or localized connector fitting.
Our flanging and end-forming services are tailored for chemical process pipes and automotive systems, ensuring dependable, leak-proof connections at joint boundaries.
Optimized heat transfer efficiency and thermal stress resistance in processing plants.
Ensuring leak-free circulation of refrigerants under varying thermal profiles.
Corrosion resistance under continuous exposure to acidic compounds.
Hygienic surfaces with minimal roughness to prevent bacterial build-up.
Electropolished inner diameters supporting high-purity fluid transfer.
Steam generation lines designed to withstand high pressure and temperature cycles.
Engineered for deep-well control lines and sour gas extraction environments.
Reliable fuel lines and hydraulic systems designed for high-stress aerospace applications.
Our quality system is verified by international inspection bodies. Below are our manufacturing and material certifications confirming compliance with global supply standards:
2205 duplex and austenitic options for high-durability subsea systems.
1/2 inch coiled configurations designed for chemical injection lines.
High-temperature oxidation resistant spools for furnace applications.
