Sihe Steel
Sihe Steel
Engineered to excel in corrosive high-pressure oil/gas wells, chemical processing plants, and marine environments.
Liaocheng Sihe Stainless Steel Material LTD: A premier global manufacturer specializing in high-alloy sheet, plate, and continuous seamless tubing developments.
Founded as a pioneering force in China's industrial steel corridor, Liaocheng Sihe Stainless Steel Material LTD has established over a decade-long track record of metallurgical excellence. Operating six advanced production lines, our facilities strictly enforce international production standards, including GB, ASTM, ASME, JIS, and EN. We specialize in producing high-integrity products across a comprehensive spectrum of steel grades: 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800.
Our specialized metallurgical capability extends to high-performance austenitic steels, duplex, and superalloys, including Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625. Driven by the demands of safety-critical operations, we deliver custom-engineered coiled tubing, bright-annealed capillary lines, and industrial plates designed to withstand the harshest physical and chemical stresses.
Currently, over 80% of our products are exported globally, catering to mission-critical infrastructure in over 30 countries and regions, including the United States, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Unlocking structural cost efficiencies and timeline reliability through integrated vertical production ecosystems.
Situated in China's industrial metalworking heartland, Liaocheng Sihe coordinates directly with domestic Tier-1 iron and steel refineries. This provides stable access to raw billets of 316L, Duplex 2205, and Super Duplex 2507, mitigating material shocks even during periods of global supply volatility.
Our in-house capabilities include high-precision cold rolling, cold drawing, orbital welding, and continuous coil annealing. By handling all processing phases in-house, we eliminate external transport bottlenecks, reduce material handling damage, and lower production costs.
Standard manufacturers require massive minimum orders for custom setups. We offer flexible production capabilities, adjusting outer diameters from 0.125 inches (3.175 mm) to 1.0 inch (25.4 mm) and wall thicknesses up to 0.165 inches (3.0 mm) with competitive lead times.
How our advanced manufacturing systems ensure microstructural integrity in high-performance steel products.
Exploring how different industries apply our plates, sheets, and coiled tubing products in the field.
Our long-run seamless coiled tubing is used in umbilical systems, chemical injection lines, and downhole control tools. Choosing corrosion-resistant alloys like Super Duplex 2507 and Inconel 625 protects systems against high concentrations of hydrogen sulfide (H2S), chlorides, and carbon dioxide (CO2) at depths exceeding 3,000 meters.
Used in high-temperature, high-pressure thermal exchange processes. Our thin-walled 316L, 304, and Incoloy 800 tubes provide efficient thermal conductivity, low thermal expansion, and resistance to localized pitting and crevice corrosion from cooling waters.
In microchip fabrication facilities, gas delivery lines must remain free from outgassing, moisture absorption, and microscopic particulate contamination. Our bright-annealed, electropolished capillary tubes provide smooth interior surfaces, ensuring clean gas transport.
Our 310S, 309S, and SUH409 alloys are designed for high-temperature service, including automotive exhaust systems, aircraft fuel conduits, and structural hydraulic tubing, maintaining material stability under rapid thermal cycling.
Value-added manufacturing and fabrication capabilities tailored to complex engineering drawings.
We support various materials (including 304, 316L, 2205) and custom specifications, covering diameters from 6.35 mm up to 19 mm for coiled configurations.
Our facility offers precision tube bending, spiral coiling, structural cold drawing, and forming services designed for custom heat exchangers and boiler systems.
We provide automated laser cutting, mechanical abrasive sawing, and gas-shielded flame cutting to deliver clean edges, tight length tolerances, and minimal deformation.
We offer mechanical polishing, pickling, and acid passivation to enhance surface finish and restore the protective oxide layer for demanding corrosive applications.
We process tube ends for flanged connections, flaring, and thread prep, supporting integration into automotive manifolds, chemical piping, and instrument installations.
Visualizing our products across heat exchange systems, cooling loops, and chemical processing facilities.
Verification of our metallurgical standards and production quality management systems.
Technical and logistics answers for procurement engineers and global distribution managers.
Browse our complete product range, including capillary tubes, heat exchanger tubes, and heavy plate fabrications.
A deep dive into alloy selections for corrosive and high-temperature services.
Our processing focus is maintaining the balanced microstructures of Duplex 2205 (UNS S32205) and Super Duplex 2507 (UNS S32750). During cooling, the phase ratio must be maintained at approximately 50% ferrite and 50% austenite to prevent the formation of intermetallic phases like sigma, which embrittle the material and decrease corrosion resistance.
Through our bright hydrogen annealing lines, cooling rates are monitored to ensure rapid heat dissipation. This process maintains dissolved nitrogen and chromium within the matrix, keeping the Pitting Resistance Equivalent Number (PREN) above 40 for Super Duplex 2507.
For high-temperature applications, such as power plant heat exchangers and automotive exhaust systems, we supply grades 309S and 310S. These materials are characterized by their high chromium and nickel content, which form an adherent oxide layer that prevents further surface scaling.
Grade 310S contains up to 25% chromium and 20% nickel, enabling it to maintain structural load-bearing capacity and resist oxidation in continuous service up to 1150°C. For stabilizing carbon in weld zones, our Grade 321 contains titanium additions that preferentially form titanium carbides, protecting the grain boundaries against sensitization and intergranular corrosion.
