Sihe Steel
Sihe Steel
Featured corrosion-resistant capillary solutions engineered for high chloride and extreme marine conditions in Southeast Asian sectors.
Dual-phase microstructure ensuring high strength and pitting resistance.
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Designed for severe acidic environments and deepwater offshore operations.
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Reliable, cost-effective alternative to high-nickel superalloys.
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Superb tensile properties combined with superior SCC protection.
Learn MoreAs Vietnam’s economic powerhouse, Ho Chi Minh City (HCMC) has quickly transformed from light manufacturing to high-tech, marine engineering, petrochemical, and semiconductor sectors. The neighboring Southern Key Economic Zone (SKEZ)—including Bà Rịa-Vũng Tàu, Bình Dương, and Đồng Nai—hosts massive oil terminals, deep-water ports, and chemical processing facilities that operate under intense humid, marine environments.
Due to coastal salinity and high ambient temperatures, traditional austenitic steels like 304 and 316L frequently fail from Stress Corrosion Cracking (SCC) and localized pitting. 2205 Duplex Stainless Steel Capillary Tubing provides the ideal solution. By balancing a 50:50 austenitic-ferritic microstructure, 2205 delivers a Pitting Resistance Equivalent Number (PREN) above 34, coupled with double the yield strength of standard stainless steels, making it a crucial component for local engineering companies, offshore system integrators, and equipment manufacturers.
Perfectly suited for coastal infrastructures, saline river estuaries, and subsea application routes in and around the Southern Vietnamese coastline.
Twice the yield strength of 316L, allowing design engineers to minimize wall thicknesses and overall weight in umbilical systems.
Essential for high-accuracy hydraulic lines, chromatography columns, and automated chemical control systems.
Comprehensive technical specifications, chemical configurations, and quality validation processes of our 2205 capillary tubing.
UNS S31803 / S32205 is strictly balanced with approximately 22% Chromium, 5% Nickel, 3% Molybdenum, and 0.18% Nitrogen. This precision configuration prevents intergranular corrosion during subsea thermal cycles and enhances overall alloy toughness in heavy-duty setups.
Our advanced multi-stage cold-drawing process yields ultra-precise dimensional tolerances (down to +/- 0.02 mm). Combined with specialized protective atmosphere bright annealing, we ensure oxide-free, mirror-smooth inner surfaces that prevent deposition blockages.
Every capillary batch undergoes complete testing: Hydrostatic Pressure testing (up to 1,000 bar), Eddy Current defect inspection, flaring/flattening tests, and PMI chemical analysis to guarantee zero leakage in hazardous offshore applications.
Years of Continuous Production Experience
Advanced Micro-Tubing Production Lines
Continuous Coiled Length Capability (No Welds)
Global Export Destinations Covered
From China, we operate six production lines specializing in manufacturing high-quality sheet, pipe developments, and stainless steel coiled tubing. As a leading industry expert, we produce high-performance stainless steel polished tubes and seamless coiled tubing under strict global production standards, including GB, ASTM, ASME, JIS, and EN.
Our extensive metallurgical portfolio includes 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Austenitic steel 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625 series steels. Our product dimensions range from an outer diameter of 0.125 inch (3.175 mm) up to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inch (3 mm). For high-integrity subsea umbilical and oil-field instrumentation projects, we deliver continuous lengths up to 32,800 feet (10,000 meters) without orbital butt welds.
As modern oil and gas operations move into deeper waters where extreme environments demand heightened safety protocols, our mission is to deliver the right corrosion-resistant materials for coiled umbilical tubing to ensure long-term, fail-safe reliability. Over the past decade, we have expanded our distribution to over 30 countries across the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Liaocheng Sihe is equipped with world-class bright annealing technology, which processes continuous online tubing softening. Our testing array includes compression, flaring, bending, 100% tensile strength checks, hardness testing, and air tightness validation. This rigorous QC process is why over 80% of our production lines are exported to support key offshore operations worldwide.
Providing custom, high-precision engineering solutions across various heavy sectors in HCMC and globally.
Designed for high-performance heat exchange in industrial chillers, condensers, and thermal power plants.
Ensures reliable refrigerant transport under high operational pressures and chemical cooling conditions.
Ideal for feeding aggressive acid media and carrying corrosive catalysts through demanding piping routes.
Mirror-polished inner surface finishes strictly prevent contamination and comply with sanitation standards.
Precision microbore capillary tubing suitable for complex process dosing, HPLC, and diagnostic devices.
Suitable for boiler steam feeds, feed-water piping, and high-pressure steam distribution headers.
Resistant to crude oil sulfur corrosion, organic acids, and chloride cracking in refineries.
Provides high-strength structural chassis lines, hydraulic brakes, and engine fuel injection lines.
Working directly with our modern manufacturing facility in Liaocheng, China, offers significant supply chain advantages. We integrate smart warehouse management systems, automatic drawing machines, and real-time process monitoring to optimize cost-efficiency and lead times.
We help local engineering firms and multinational firms in HCMC minimize raw material storage costs. Leveraging direct container shipping from Qingdao or Tianjin Port to Cat Lai Port (HCMC), we offer highly reliable shipping routes. This direct integration bypasses intermediate distributors, reducing procurement costs while securing certified material traceability.
Supports processing custom dimensions, varying outer diameters (6.35 mm to 19 mm), and wall thickness configurations in grade 304, 316L, and 2205 steel coils.
Precision bending, spiral forming, coiling, and high-precision drawing designed to meet tight heat-exchanger tolerances.
Advanced automatic cutting machines ensure clean burr-free cuts, accurate lengths, and pristine end profiles for immediate system integration.
Our production strictly adheres to standard norms, supported by complete laboratory test certificates.
Explore our full range of coiled, straight, and customized stainless steel tubing solutions for global distribution.
Extremely long continuous lines ideal for petrochemical control lines.
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Seamless construction eliminates the risk of longitudinal weld failure.
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Cost-efficient precision capillary configurations for quick imports.
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Standard OD/WT size designed for high-pressure control manifolds.
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Chemical-resistant polymers coating for subsea hydraulic lines.
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Ideal for structural reinforcement panels and chemical vessels.
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Optimized weldability and design reliability for standard operations.
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Cost-efficient exhaust piping configurations for automotive platforms.
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Economical solution for non-corrosive exhaust routing structures.
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Excellent oxidation resistance for automotive exhaust configurations.
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Super-austenitic alloy offering high resistance to hot sulfuric acids.
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Ferritic alloy grade featuring good corrosion resistance and ductility.
View Details2205 duplex stainless steel (UNS S31803 / S32205) is characterized by a carefully balanced 50:50 ratio of ferrite and austenite phases. This configuration provides a unique combination of high yield strength and superior corrosion resistance, far exceeding standard austenitic grades such as AISI 316L or 317L. The presence of both phases inhibits Stress Corrosion Cracking (SCC) pathways, which commonly cause catastrophic failure in warm chloride environments like those in Southern Vietnam.
By utilizing 2205 duplex capillary lines for pneumatic systems and control valves, design engineers can prevent sudden localized corrosion failures, saving significant maintenance and downtime costs for deep-sea oil and gas offshore installations.
The pitting resistance of duplex alloys is evaluated using the Pitting Resistance Equivalent Number (PREN) formula: PREN = %Cr + 3.3(%Mo + 0.5%W) + 16%N. Standard 2205 duplex tubing yields a PREN rating between 32 and 35. For comparison, AISI 316L scores only about 24. This notable performance improvement is due to three key alloying elements:
Manufacturing high-integrity capillary tubing requires strict control over dimensional tolerances and surface finishes. Our cold-drawing production facility features advanced hydraulic draw benches capable of producing capillary tubes with outer diameters from 0.5 mm up to 10 mm. Following cold working, our online bright annealing furnace heat-treats the tubes in a hydrogen-purged environment at temperatures over 1050°C. This process ensures recrystallization without surface scaling, leaving a clean, mirror-smooth inner surface (roughness Ra < 0.4 μm) to prevent flow restriction.
For procurement managers in HCMC, Binh Duong, and Vung Tau, direct sea shipping from China provides optimized transit schedules. Under the ASEAN-China Free Trade Agreement (ACFTA), importers can secure preferential customs tariffs by presenting a valid Form E Certificate of Origin. This can significantly reduce import duty rates on stainless steel components, improving overall project margins.
We work closely with major logistics providers to deliver seamless customs clearance at Cat Lai port, minimizing delays and ensuring critical raw materials arrive on site on schedule.
Expert insights regarding procurement, technical specifications, and shipping of duplex capillary tubes to HCMC.
Our raw material prices depend on metal market fluctuations, order sizes, and custom processing options. Please send us your detailed specification requirements (OD, WT, Length), and our export sales team will provide an updated, customized price quote.
Yes, we require a minimum order quantity for international shipments to ensure production efficiency. For standard size duplex 2205 capillary tubing, our MOQ is typically 500 meters. For custom-developed sizes, the MOQ varies depending on the specific tooling required.
Yes. We provide comprehensive mill test documentation, including EN 10204 3.1 Mill Test Certificates (MTC), chemical analysis certificates, mechanical test reports, hydrostatic validation records, and NDT (Eddy Current) inspection reports.
Sample production takes approximately 7 days. For bulk orders, manufacturing is typically completed within 20 to 30 days after deposit confirmation. Ocean transit from major Chinese ports to HCMC (Cat Lai) takes an additional 7 to 10 days.
We accept secure wire transfers (T/T), L/C at sight, Western Union, and PayPal. Our standard payment terms are a 30% deposit in advance, with the remaining 70% balance paid against presentation of the copy of the Bill of Lading (B/L).
Yes. All coiled capillary tubing is wrapped in secure protective plastic, mounted on heavy-duty wooden spools, and packed in reinforced plywood cases to prevent ocean mist contamination and physical impact during transit.