Sihe Steel
Sihe Steel
Browse our top-tier stainless steel coiled, welded, and capillary tubes manufactured under strict international standards.
High-precision polished ASTM A269 Grade 202 tubes, engineered for decorative and light-corrosion industrial systems demanding smooth finishes.
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Cost-efficient ASTM A312 Grade 201 welded steel pipes, optimized for structural and fluid transmission applications in mild environments.
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Super alloy Incoloy 825 micro-bore tubing offering extreme resistance to chloride-induced stress corrosion cracking and localized pitting.
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High-integrity welded pipes compliant with German DIN standards, designed using premium AISI 304 raw materials for reliable fluid transfer.
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Ferritic 409 grade pipes possessing superior oxidation and corrosion protection properties, custom-designed for automotive exhaust applications.
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Polished surface ASTM A269 grade 201 tubing combining structural strength with an aesthetic mirror or satin finish.
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Bespoke 201 grade decorative and mechanical tubes optimized for cost-effective manufacturing and architectural designs.
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Heavy-duty 304 seamless coiled tubing designed for high pressure hydraulic control lines and chemical injection systems in oilfields.
View DetailsFrom our state-of-the-art facility in China, Liaocheng sihe stainless steel material LTD stands as a global leader in manufacturing high-performance stainless steel coiled tubing, precision capillary tubes, and seamless instrumentation solutions. With our integrated engineering capabilities and six advanced production lines (including specialized lines with ten years of historical R&D dedicated specifically to ultra-long coiled tubing), we deliver micro-tubes that conform strictly to GB, ASTM, ASME, JIS, and EN standards.
We process an extensive alloy spectrum including classic austenitic steels like 304/304L, 316L, 321, 317L, 309S, and 310S alongside advanced super alloys such as INCOLOY 800, Incoloy 825, Inconel 625, Duplex 2205, and Super Duplex 2507. Our precision-engineered capillary tubes support critical components in high-reliability markets including semiconductor fabrication, pharmaceutical biotech, aerospace propulsion, marine engineering, and oil exploration.
Addressing macro-economic industrial demands with custom alloy configurations, long continuous lengths, and secure logistics.
Modern industrial operations face mounting supply chain vulnerabilities, volatile raw material indices, and escalating quality standards. For global B2B procurement professionals, sourcing high-integrity 304 Stainless Steel Capillary Tubing requires more than identifying a low-cost supplier. It demands a manufacturing partner capable of maintaining strict tolerance limits (often to ±0.01 mm OD), delivering continuous weld-free lengths up to 32,800 feet (10,000 meters), and providing comprehensive documentation packages.
Liaocheng Sihe alleviates global supply bottlenecks by implementing world-class online bright annealing (bright softening). This advanced thermal processing prevents surface oxidation and preserves structural malleability, facilitating worry-free bending, spiral coiling, and flanging. Over 80% of our products are exported to demanding markets in the United States, Germany, Spain, South America, Southeast Asia, and the Middle East, satisfying critical needs for umbilical subsea tubing, control lines, and gas delivery manifolds.
Our solutions cater directly to engineers seeking reliable corrosion protection, high burst pressure resistance, and exceptionally clean interior diameters (ID). By controlling raw chemical ratios (such as managing Carbon content below 0.08% for standard 304 and 0.03% for 304L), we minimize carbide precipitation during welding, preserving structural integrity in corrosive environments.
Verified physical and chemical characteristics of our stainless steel and super alloy tubing lineup.
| Steel/Alloy Type | UNS Designation | Standard Specs | Outer Diameter (OD) Range | Wall Thickness (WT) Range | Key Industrial Advantages |
|---|---|---|---|---|---|
| 304 / 304L | S30400 / S30403 | ASTM A269 / A312 | 0.125" - 1.0" (3.175 - 25.4mm) | Up to 0.165" (4.19mm) | Excellent general corrosion resistance, easy formability, cost-efficient. |
| 316 / 316L | S31600 / S31603 | ASTM A269 / A213 | 0.04" - 1.0" (1.0 - 25.4mm) | Up to 0.165" (4.19mm) | Superior chloride pitting resistance via molybdenum addition. |
| Duplex 2205 | S31803 / S32205 | ASTM A789 / A790 | 0.25" - 1.0" (6.35 - 25.4mm) | Custom up to 3.0mm | Double the yield strength of austenitcs, exceptional SCC resistance. |
| Incoloy 825 | N08825 | ASTM B423 | 0.125" - 0.75" (3.175 - 19.05mm) | 0.035" - 0.083" (0.89 - 2.11mm) | High resistance to reducing/oxidizing acids, sulfur compounds. |
| Inconel 625 | N06625 | ASTM B444 | Custom Micro-Bores | Custom High-Pressure | High temperature strength up to 982°C, extreme oxidation resistance. |
We design beyond standard limits, offering tailor-made modifications to guarantee system compatibility.
We support various materials (e.g., 304, 316L, 2205) and custom specifications ranging from outer diameters of 6.35mm to 19mm for coiled configurations.
Advanced shaping workflows including tight bending, custom spiral forming, precision cold drawing, and stress-relieving specialized heat exchangers.
Non-deforming laser cutting, specialized mechanical cutting, or targeted flame cutting to provide burr-free ends for seamless connector integration.
Electropolishing (EP), bright annealing, chemical pickling, and passivation. We develop high-purity interior surfaces for semiconductor applications.
Robust flange end connections vital for high-temperature automotive exhaust lines, chemical transport pipes, and precision instruments.
Our precision tubes provide the backbone for critical fluidics, gas delivery, and structural components across modern industries.
Pioneering precision metallurgy to satisfy next-generation micro-fluidic, aerospace, and energy transition applications.
The future of precision instrumentation is shifting toward extreme environments and miniaturization. At Liaocheng Sihe, we align our metallurgy development with key international technology trends:
Our quality assurance workflow employs inline eddy current inspection alongside automated air-tightness testing to verify 100% material integrity throughout production. By refining carbon-trapping processes during induction melting, we guarantee our 304, 316, and Incoloy alloys maintain phase stability under structural and thermal stress.
This technical roadmap ensures that our engineering clients receive products that exceed the specifications of tomorrow's precision instrument designs.
Every shipment undergoes extensive material validation tests and is backed by industry-accredited certifications.
Explore custom options across coiled tubing, capillary configurations, heat exchangers, and flat metal plates.
Manufactured in Duplex 2205, Super Duplex 2507, and premium grade 316L for high-pressure control lines.
Precision drawn coiled tubing, available in sizes ranging from 1/8 inch to 1 inch outer diameter.
High-temperature oxidation resistant coiled tubing, designed for thermal processing environments.
Advanced capillary and instrumentation lines processed using our automated bright annealing line.
Corrosion resistant capillary solutions designed for chromatographs and analytical instruments.
Ultra-long umbilical lines designed for downhole oil injection systems and offshore platforms.
High-strength welded tubes, manufactured to ASTM A312 standards for general industrial plumbing.
High thermal conductivity options designed for chemical processing and industrial cooling towers.
Ultra-thin micro-tubes designed for medical catheters and high-reliability aerospace sensors.
Aesthetic bright finished options, engineered for design applications and sanitation equipment.
Incoloy 825 and Inconel 625 coils, engineered for extreme resistance to acidic and high-temperature conditions.
Robust heavy wall tubes designed to handle high pressures in petroleum recovery and offshore exploration.
Straightened and cut-to-length tubes, optimized for condenser and evaporator manufacturing.
Get immediate answers to common technical, logistics, and purchasing queries regarding our products.
Examine our wider catalog of precision pipes, specialized coils, and nickel-alloy solutions.
Polished tubes compliant with European EN 1.4372 guidelines, balancing chemical structure stability with structural strength.
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Robust coiled tubing available in continuous long lengths, engineered to minimize field welds in high-pressure oil and gas systems.
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Highly demanded 1/4" outer diameter by 0.049" wall thickness 304 seamless coiled tubing, ideal for general hydraulic control manifolds.
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High-strength Duplex 2205 coiled tubing designed for high-chloride marine settings, offering protection against pitting and fatigue.
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Dual-certified JIS and DIN TP 316L precision tubes. Designed with close dimension tolerances for instrumentation networks.
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Precision micro-bore 316L capillary tubes, offering high resistance to chemical corrosion in pharmaceutical equipment.
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Encapsulated 316 steel tubing providing an extra layer of mechanical defense for harsh subsea and underground environments.
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Highly alloyed 904L coiled tubing designed for high sulfuric acid concentrations, offering reliable performance under tough chemical conditions.
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