Sihe Steel
Sihe Steel
Explore our engineering-grade alloy 2507 coiled tubes and related materials, manufactured under global standards.
Liaocheng sihe stainless steel material LTD From China operates six state-of-the-art production lines, specializing in high-quality sheets, pipes, and coiled tubing development. We are widely recognized as a leading expert in the manufacturing of stainless steel coiled tubes, stainless steel polishing tubes, and stainless steel seamless coiled tubing. Adhering strictly to global industrial production standards—including GB, ASTM, ASME, JIS, and EN—our facility processes a diverse catalog of high-performance steels: 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Austenitic steel 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625 series, alongside other tailored specialty grades.
Our coiled tubing portfolio is designed to withstand intense pressure and aggressive chemical environments. Dimensional capabilities range from an outer diameter (OD) of 0.125 inch (3.175 millimeters) to 1 inch (25.4 millimeters), with wall thicknesses (WT) up to 0.165 inch (3 millimeters). To optimize offshore umbilical structures and minimize field-welding vulnerabilities, we supply continuous single-coil lengths up to 32,800 feet (10,000 meters). Customized geometries outside these standards are routinely delivered to meet specific client requests.
Alloy 2507 (UNS S32750) is a premium Super Duplex stainless steel engineered for highly corrosive applications requiring extreme tensile strength and chloride localized corrosion resistance. Featuring a balanced 50/50 dual phase microstructure of austenite and ferrite, Alloy 2507 combines the mechanical resilience of ferritic steels with the ductile workability of austenitic grades.
The alloy boasts a nominal composition of 25% Chromium, 7% Nickel, 4% Molybdenum, and 0.28% Nitrogen. This high alloying density translates to a Pitting Resistance Equivalent Number (PREN = %Cr + 3.3%Mo + 16%N) exceeding 41. Practically, this ensures unmatched protection against localized crevice corrosion and pitting in severe marine environments, outperforming standard 316L and standard duplex alloys (such as 2205) by a wide margin.
As oil and gas extractions advance into deeper waters and high-pressure/high-temperature (HPHT) reservoirs, subsea safety requirements become absolute. Our coiled umbilical tubing provides crucial fluid pathways, chemical injection lines, and hydraulic controls for control pods. The structural integrity of Super Duplex 2507 minimizes downtime risks and prevents catastrophic pipeline failure under hydrostatic pressure.
Liaocheng Sihe manufactures a broad line of custom-processed tubes, sheets, and capillary networks.
High performance 2205/2507 duplex stainless steel with seamless construction for high pressure applications.
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1/2 inch coiled tubing manufactured for downhole chemical injections and control lines.
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Heat-resistant 310/310S grade coiled tubes suited for high-temperature furnace gas lines.
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Engineered corrosion protection for extreme subsea control systems and chemical processing.
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Coiled tubes capable of holding extreme pressures in hydraulic exploration setups.
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Smooth inner surfaces minimizing turbulent flows and chemical residues.
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Continuous length manufacturing up to 10,000 meters for umbilical bundles.
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Optimized thermal transmission rates combined with high chemical resistance.
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Micro-bore tubes for medical instruments, chromatography, and sensor probes.
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Standardized seamless control line coils for processing control panels.
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Mechanically or chemically polished inner bore for ultra-pure sanitary setups.
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Ultimate chemical resistance in sour gas environments containing high H2S.
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Bespoke fabrication including complex bending, end-flanging, and special coil sizes.
LEARN MOREFrom deep-sea subsea templates to high-velocity chemical reactors, Alloy 2507 offers specialized service.
In high-salinity seawater desalination plants across the GCC, chloride corrosion attacks standard pipe infrastructures. Implementing Alloy 2507 coiled tubing in condenser configurations and feed lines eliminated micro-cracking and galvanic corrosion. This reduced maintenance shut-downs by 40% and improved heat-transfer consistency due to thinner, high-strength walls.
Operating under water depths exceeding 2,500 meters, subsea controls require ultra-long continuous fluid routes. Sihe's 10,000-meter continuous seamless coils in Alloy 2507 were used in hydraulic power links. The lack of orbital welds in the dynamic catenary zones of the riser significantly reduced fatigue cracking and localized stress corrosion risks.
Custom-engineered processing designed to meet rigorous chemical and aerospace requirements.
We process various corrosion-resistant materials (such as 304, 316L, 2205) and special sizes (OD 6.35mm to 19.05mm) to meet structural demands.
Includes high-precision bending, spiral coiling, seamless drawing, and complex profiles optimized for thermal transfer.
Precision mechanical shearing, laser trimming, and straight-line configurations to provide ready-to-assemble sub-components.
Bright annealing (hydrogen atmosphere) and polishing procedures to provide clean surfaces that resist build-up.
Specialized end-forming and flanging designed for automotive exhaust systems, high pressure chemical valves, and instrumentation setups.
Adapting manufacturing parameters to meet next-generation subsea extraction and green energy challenges.
Liaocheng Sihe Stainless Steel Material LTD leverages regional industrial clusters in Shandong to secure premium steel inputs. With a 10-year manufacturing history and 3 specialized coil production lines, our facility maintains raw material access, ensuring consistent production schedules and stable pricing compared to Western competitors.
Every meter of coiled tubing undergoes strict non-destructive and mechanical testing protocols before shipping:
Currently, up to 80% of our production is exported worldwide, including to the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe, demonstrating global market trust in our reliability and supply security.
Our processing holds international certifications, meeting the compliance requirements of major marine and engineering authorities.
Technical answers regarding ordering, metallurgy, lead times, and engineering specifications.
Explore our range of heat exchanger components, thin-wall precision tubes, and decorative sheets.
