Sihe Steel
Sihe Steel
Select from our engineering-grade stainless steel capillary and coiled tube portfolio designed to operate under critical pressures.
In modern industrial applications, fluid transfer pathways must endure severe thermal fluctuations, high pressure limits, and chemical exposure. Stainless steel coiled tubing has transitioned from a niche component to a critical element in oil exploration, petrochemical refining, aerospace fuel lines, and precision analytics. Selecting the optimal alloy—specifically comparing 201, 304, and 316 grades—represents a balance between mechanical reliability, environmental corrosion dynamics, and capital expenditure targets.
At Liaocheng Sihe Stainless Steel Material LTD, we operate six advanced production lines utilizing state-of-the-art online bright annealing technologies. This allows us to manufacture ultra-long seamless and welded coiled tubing conforming to rigorous international standards including GB, ASTM, ASME, JIS, and EN. Our expertise spans traditional austenitic formulations to elite nickel alloys and duplex variants (2205, 2507, 825, 625), delivering solutions for complex downhole and surface system integrations globally.
Deciding which grade of coiled tubing to purchase requires analyzing the chemical composition of each metal. Each alloy exhibits distinct behaviors under mechanical load and corrosive environments:
| Steel Grade | Chromium (Cr) % | Nickel (Ni) % | Molybdenum (Mo) % | Pitting Index (PREN) | Primary Application Environment |
|---|---|---|---|---|---|
| JIS SUS201 | 16.0 - 18.0 | 3.5 - 5.5 | N/A | ~17 | Exhaust pipes, indoor structural tubing, mild air lines |
| ASTM A269 304 | 18.0 - 20.0 | 8.0 - 11.0 | N/A | ~19 | HVAC, food processing, heat exchangers, standard hydraulics |
| ASTM A312 316L | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | ~23 - 25 | Marine, offshore umbilicals, deepwell injection, biopharm |
| Alloy 825 / 625 | 19.5 - 23.5 | 38.0 - 46.0 | 2.5 - 3.5 | >30 | Acid gas wells, geothermal, deepwater subsea control lines |
The global demand for high-strength stainless steel coiled tubing is growing, driven by the expansion of offshore drilling, geothermal energy projects, and advanced chemical automation. Historically, sourcing continuous long-length tubing required welding short segments together. This created heat-affected zones (HAZs) that were prone to stress-corrosion cracking (SCC).
Today, advanced mills like ours draw seamless coils up to 32,800 feet (10,000 meters) without orbital welds. This continuous construction is crucial for modern umbilical lines, where fluid lines must run deep into offshore wells without any weak points. At the same time, regional logistics centers in North America and Western Europe are demanding stricter certifications (such as material test certificates compliant with EN 10204 3.1) and customized wood-spool packaging to streamline field installations.
China is a major source of high-quality stainless steel coils. At Liaocheng Sihe Stainless Steel Material LTD, we combine this localized capacity with modern manufacturing technology to deliver several key advantages:
Our proximity to local raw steel suppliers allows us to source premium billets with low carbon levels, ensuring clean steel chemistry before drawing begins.
Our mills feature inline hydrogen-protected bright annealing systems. This process relieves internal stress while keeping the tubing scale-free and maintaining a mirror-like finish.
With multiple operational lines running simultaneously, we reduce mass production lead times to just 20-30 days, keeping our clients' operations running on schedule.
Liaocheng Sihe Stainless Steel Material LTD has spent over a decade refining its production systems. Our factory currently exports roughly 80% of its total coiled tubing output to demanding markets across the United States, Germany, Spain, South America, Southeast Asia, and the Middle East. This global reach is built on strict quality control: every coil undergoes comprehensive hydrostatic, flaring, flattening, and eddy current testing to guarantee performance under high pressures.
From subsea control lines to precision laboratory instrumentation, our products are built for demanding environments.
Continuous seamless configurations reduce joint count, minimizing the risk of leaks in high-temperature chemical exchange systems.
Durable 304 and 304L coils provide excellent thermal conductivity and corrosion resistance when exposed to modern refrigerants.
Alloy 825 and Grade 316L capillaries deliver performance under high pressure, maintaining systemic control in aggressive chemical processing environments.
Smooth internal surface finishes prevent microbial accumulation, meeting food and dairy safety standards.
Electropolished and ultra-clean capillary tubes are ideal for analytical instrumentation and dosage delivery systems.
Super duplex and high-nickel coils withstand geothermal steam containing corrosive dissolved minerals.
Heavy-wall coiled tubes run along oil field umbilicals to safely transport hydraulic control fluids over miles of seafloor.
High-vibration fuel lines and high-temperature exhaust piping benefit from the structural properties of SUS201/304 coils.
To meet the unique specifications of your project, our facilities offer customized processing services for coiled tubing. We support complex fabrication steps and supply chains to ensure integration with your existing equipment:
Every shipment is backed by material test certificates (MTC) and undergoes strict testing including hydrostatic, air tightness, and flare testing before export.
We maintain a rigorous quality assurance workflow to ensure compliance with global engineering codes.
Technical answers to help buyers evaluate structural compatibility, grade selection, and order logistics.
Our pricing model adapts to the current LME (London Metal Exchange) nickel and molybdenum indexes, along with order quantity and sizing requirements. Contact our sales team with your specifications, and we will provide an updated, detailed quotation.
Yes, we require a minimum order quantity for international shipments to ensure shipping and production efficiency. For custom sizes or specialized grades (such as duplex 2205 or Inconel 625), MOQ limits vary. Please contact us to discuss your project requirements.
Every shipment is fully traceable. We provide comprehensive documentation, including Certificates of Analysis (COA) / Conformance, EN 10204 3.1 Material Test Certificates, Hydrostatic Testing Reports, Eddy Current Traceability Files, and Country of Origin certification for global customs clearance.
Standard prototype or evaluation samples can be dispatched within 7 days. For mass production orders, lead times typically range from 20 to 30 days after receiving your deposit and final design approval. If you are working toward a tight project deadline, let us know and we will do our best to accommodate your schedule.
We accept wire transfers (T/T), L/C, Western Union, and PayPal. Our standard terms are a 30% deposit in advance, with the remaining 70% balance paid upon presentation of the Bill of Lading (B/L) copy.
We provide a comprehensive warranty covering material purity and manufacturing workmanship. If you encounter any issues with chemical tracking or wall-thickness consistency, our engineering team will work to resolve the problem promptly.
We package all coils on heavy-duty wooden or steel drums, wrapped in water-resistant plastic sheeting and padded with protective layers. This robust packaging protects the coils from physical distortion, scratching, and sea-salt exposure during long-distance maritime transport.
Shipping rates depend on order volume, weight, delivery terms (e.g., FOB, CIF, DDP), and your choice of transport. While air freight is fastest, ocean freight is usually the most cost-effective option for large bulk orders. We can provide shipping estimates once we have your order details and delivery address.
View additional options, including heat exchanger tubes, capillary piping, and custom cold-rolled sheets.
