Sihe Steel
Sihe Steel
Exacting dimensional tolerance profiles engineered to withstand corrosive media and high-pressure differentials.
Stainless steel capillary tubing serves as a core conduit in modern industrial applications. These ultra-small diameter tubes demand exact concentricity, internal surface roughness controls, and pressure-resistant wall thicknesses. At Liaocheng Sihe Stainless Steel Material LTD, our drawing operations transform structural raw tubes into precision-engineered conduits with outer diameters as small as 0.125 inches (3.175 mm).
Our processing controls ensure compliance with standards like ASTM A269 and EN 10216-5. This satisfies the requirements of subsea exploration engineers, semiconductor design teams, and chromatography equipment developers who need reliability in challenging environments.
Liaocheng Sihe is a leading expert in the production of stainless steel coiled tubing, polishing tubes, and seamless capillary systems.
Matching the right alloy chemistry to service environments avoids failure. We process high-performance grades strictly configured to standard rules.
| Alloy Grade | Key Elements (Cr, Ni, Mo, N) | Yield Strength (Min) | Primary Industrial Application |
|---|---|---|---|
| 304 / 304L | 18% Cr - 8% Ni | 205 MPa | General HVAC, domestic heat exchangers, instrumentation. |
| 316L | 16% Cr - 10% Ni - 2% Mo | 190 MPa | Marine fittings, HPLC equipment, food processing, biotech. |
| 321 | 17% Cr - 9% Ni + Ti Stabilized | 205 MPa | Aerospace exhausts, high-temperature heat exchangers. |
| Duplex 2205 | 22% Cr - 5% Ni - 3% Mo - 0.18% N | 450 MPa | High-pressure subsea control lines, chemical reactors. |
| Super Duplex 2507 | 25% Cr - 7% Ni - 4% Mo - 0.27% N | 550 MPa | Deep-water subsea umbilicals, desalination systems. |
| Incoloy 825 / Inconel 625 | Ni-Cr-Mo Alloys | Over 275 MPa | Extreme sour gas wells, petrochemical, military components. |
Our quality assurance program is built on physical testing protocols to verify tube integrity prior to shipment. Cold drawing introduces mechanical stress that work-hardens the alloy, increasing brittleness. To restore ductility, corrosion resistance, and metallurgical balance, our factory utilizes an online Bright Annealing (BA) heat treatment system.
100% Eddy Current and hydrostatic testing detects sub-surface defects, pinholes, and micro-cracks before dispatch.
We execute strict flare, flattening, tensile strength, and 100% hardness tests to confirm compatibility with standard bending and connection tools.
We offer single continuous spools up to 32,800 feet (10,000 meters) without orbital welds, reducing potential leakage pathways in deep-water applications.
Liaocheng Sihe products are engineered for clean-room installations, offshore structures, and precise analytical setups.
We support global sourcing needs with secondary tube processing services, reducing the need for post-procurement work.
We provide custom dimensional processing, supporting coiled tubing configurations with outer diameters from 6.35 mm to 19 mm, tailored to specialized system layout architectures.
We perform precise coiling operations, including helical and snake layout shapes, designed to meet dimensional constraints in compact heat exchangers and sensor jackets.
We utilize precision mechanical and clean abrasive cut systems to ensure straightness tolerances and clean tube ends, eliminating burrs and surface defects prior to installation.
We offer mechanical and electrochemical surface treatments, including internal polishing configurations, to limit particulate capture in high-purity fluid lines.
We provide structural end-forming, including flanged connections, designed to ensure gas-tight seals in automotive exhaust assemblies and heavy chemical processing operations.
Liaocheng, situated in Shandong Province, stands as a major hub for raw steel and precision manufacturing, offering key supply chain advantages. Choosing Liaocheng Sihe as your primary manufacturing partner provides direct access to localized industrial integration.
Our direct access to regional raw alloy processing centers ensures stable steel prices and mitigates supply risks. Our proximity to major shipping ports like Qingdao helps minimize transport lead times and shipping costs for international freight.
Over a decade of operations has allowed us to invest in specialized technologies, including online hydrogen bright annealing ovens, precision multi-roll cold drawing systems, and full-spec testing equipment, keeping us competitive in global markets.
All manufacturing processes are conducted in accordance with ISO 9001 quality guidelines, ensuring compliance with international project specifications.
Liaocheng Sihe designs solutions for major industrial sectors where precision and reliability are critical.
As offshore exploration continues to push into deeper, harsher marine environments, subsea systems demand high corrosion resistance and high-pressure ratings. Liaocheng Sihe manufactures continuous long-length coiled tubes in Duplex 2205, Super Duplex 2507, and Incoloy 825. These alloys are selected to withstand high saltwater pressures, sour gas, and chloride environments, protecting hydraulic control systems and chemical injection lines.
Semiconductor manufacturing facilities require piping systems with minimal surface variations. Our 316L precision tubes undergo bright hydrogen annealing, producing a clean interior surface with low roughness (Ra). This helps prevent contamination, particulate accumulation, and moisture retention in the delivery lines for specialized high-purity gases.
Modern medical diagnostics, pharmaceutical production, and environmental testing rely on chromatography equipment for trace-element analysis. Our cold-drawn, micro-bore capillary tubing features consistent internal dimensions. This helps maintain steady flow profiles and pressure drops, reducing cross-contamination in fluidic paths.
Key information regarding ordering logistics, material documentation, and custom fabrication services.
Browse our selection of precision tubes, high-performance alloys, and coiled heat exchanger tubing.
Liaocheng Sihe operates within strict industrial standards, producing durable stainless steel and nickel-alloy components.
Duplex 2205 and 2507 stainless steels combine austenitic and ferritic structures, offering high mechanical strength and resistance to stress corrosion cracking in marine environments.
Our 1/2" stainless steel coiled tubing is designed for chemical transfer and steam trace lines, helping to minimize thermal loss and maintain temperature control.
Grade 310 offers oxidation and heat resistance up to 1100°C, making it suitable for furnace components, high-temperature heat exchangers, and thermal processing applications.
