Sihe Steel
Sihe Steel
Explore our industrial-grade stainless steel catalog, manufactured to rigorous ASTM, ASME, JIS, and EN specifications.
When selecting metallurgical components for critical process lines, hydraulic control loops, and umbilical cables, engineering teams prioritize material integrity, pitting resistance, and seamless construction. ASTM A269 316L Stainless Steel Coiled Tubing represents the pinnacle of high-performance fluid transportation technology. Engineered with a low-carbon variant of the traditional 316 austenitic alloy, 316L (UNS S31603) minimizes the risks associated with chromium carbide precipitation at grain boundaries during welding, ensuring excellent resistance to intergranular corrosion.
"The primary mechanical advantage of coiled tubing under ASTM A269 is the drastic reduction of physical connection points, which directly translates to a lower probability of structural leakage, reduced assembly times, and minimized turbulent flow profiles within high-pressure systems."
The addition of Molybdenum (2.0% to 3.0%) combined with a balanced Nickel concentration (10.0% to 14.0%) provides ASTM A269 316L with an improved Pitting Resistance Equivalent Number (PREN) compared to standard 304/304L steels. This chemical structure makes it exceptionally suitable for service in highly corrosive environments, including chloride-laden sea spray, acidic chemical processes, and high-temperature steam loops.
| Element | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | }
|---|---|---|---|---|---|---|---|
| ASTM A269 316L Min % | 16.00 | 10.00 | 2.00 | — | — | — | — |
| ASTM A269 316L Max % | 18.00 | 14.00 | 3.00 | 0.030 | 2.00 | 0.75 | 0.045 |
| Typical Value (Sihe Steel) | 17.20 | 12.10 | 2.25 | 0.021 | 1.45 | 0.50 | 0.030 |
In the modern industrial landscapes of North America, Europe, and the Middle East, procurement teams are actively looking to mitigate downstream maintenance costs by specifying ultra-long seamless coiled tubes. The transition from short, segmented straight pipes to continuously spooled coiled tubing is driven by two main operational metrics: installation velocity and structural reliability. In subsea extraction wells, chemical injection lines, and refinery instrumentation panels, a single weld failure can halt operations, resulting in millions of dollars in downtime.
Additionally, with the global rise of the hydrogen economy, green energy infrastructure, and ultra-high purity (UHP) gas lines in semiconductor fabs, ASTM A269 compliant tubes are seeing unprecedented demand. The requirement for smooth inner-surface profiles, achieved through precision mechanical polishing and bright hydrogen annealing, prevents contaminant entrapment and hydrogen embrittlement.
At Liaocheng Sihe Stainless Steel Material LTD, we operate six state-of-the-art production lines designed around the principles of Manufacturing 4.0. Our facility utilizes advanced real-time laser gauging, inline eddy current inspection, and automated cold-drawing technology to guarantee sub-millimeter tolerances on both wall thickness and concentricity.
Our competitive edge lies in the combination of raw material vertical integration, extensive engineering expertise, and advanced online bright annealing technology. Annealing under a high-purity hydrogen gas atmosphere eliminates surface oxidation without the need for chemical pickling, resulting in a mirror-like finish. This process reduces surface roughness, making the tubing suitable for high-purity biopharmaceutical and semiconductor applications.
Industrial performance is defined by manufacturing precision. Discover the structural features that distinguish Sihe Steel's products.
Our online bright annealing technology soft-treats the austenitic matrix under pure hydrogen, resulting in an oxide-free inner and outer surface. This prevents mechanical scaling and increases tube ductility for complex bending.
Every meter of our coiled tubing undergoes hydrostatic, pneumatic, and eddy current testing. We perform hardness, flaring, compression, and mechanical tensile tests to verify compliance with international ASTM A269 standards.
We supply continuous, orbital weld-free coils up to 32,800 feet (10,000 meters) in length. This long configuration minimizes potential joint failures and simplifies installation in deepwater subsea control umbilicals.
We provide a range of value-added manufacturing options, including precise high-speed laser cutting, spiral bending, mechanical straightening, flanging, and custom surface polishing.
Along with 316L, we offer specialized materials including Super Duplex 2507, Duplex 2205, Inconel 625, and Incoloy 825 to meet demanding chemical and marine corrosion requirements.
We provide full material traceability for all shipments. This includes Mill Test Certificates (MTC) conforming to EN 10204 3.1, alongside Certificate of Origin and custom export documentation.
Designed for performance. Our ASTM A269 316L coiled tubing is used across demanding global industries.
Recognizing that standard dimensions do not fit every engineering design, Liaocheng Sihe offers specialized custom fabrication. Our technical team works directly with client specifications, managing wall thicknesses up to 3mm (0.165 inches) and outer diameters ranging from 3.175mm (0.125 inches) to 25.4mm (1.0 inch).
We supply pre-bent configurations, spiral helical bundles, and custom coiled geometries designed to slot directly into heat exchanger shells, saving time during final assembly.
We offer precise flanged, flared, and cut-to-length options to ensure clean, leak-free integration with compression fittings and analytical instrumentation valves.
Our automated laser division performs burr-free perpendicular cuts on critical, high-volume order components, maintaining precise edge tolerances.
We maintain strict ISO 9001:2015 quality controls and material compliance certificates for our global shipments.
Browse our core product categories, optimized for fluid transport and process heat transfer applications.
2205 duplex and austenitic stainless steel coils designed to withstand elevated pressures and pitting.
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Standard 1/2-inch outer diameter coiled tubing configured for oil, gas, and instrument control lines.
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High-temperature oxidation resistant 310S steel tubes designed for furnace applications and boiler loops.
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Essential technical information and purchasing guidance from our engineering department.
Additional steel products manufactured to meet ASTM, JIS, and DIN specifications.
