Sihe Steel
Sihe Steel
Explore our precision-engineered core selection of stainless steel and duplex alloy coiled tubing, manufactured strictly to ASTM/ASME/JIS standard specifications.
Within B2B manufacturing, the specification of fluid transfer lines is a high-liability engineering decision. Standard 304-grade stainless steels suffer catastrophic failures when subjected to seawater, warm chloride solutions, and concentrated acidic environments. SUS316 and SUS316L austenitic stainless steels resolve this threat through the deliberate metallurgical addition of 2.0% to 3.0% Molybdenum (Mo).
Molybdenum significantly raises the alloy's Pitting Resistance Equivalent Number (PREN), calculated mathematically as:
PREN = %Cr + 3.3 * %Mo + 16 * %N. The increased PREN rating prevents localized chloride attacks, preserving the mechanical integrity of long-length continuous operations. The low carbon content in SUS316L (≤0.03%) eliminates the risk of chromium carbide precipitation during thermal operations such as orbit welding, maintaining peak intergranular corrosion resistance adjacent to weld zones.
"By supplying continuous, orbital-weld-free spools up to 32,800 feet (10,000 meters) in length, we eliminate mechanical fitting leak pathways, significantly lowering system maintenance costs across subsea umbilicals and petrochemical facilities."
Liaocheng Sihe Stainless Steel Material LTD has engineered a comprehensive quality-control loop. Operating advanced high-speed drawing machines, continuous bright annealing lines, and automated inline testing setups, we fulfill massive volume orders while strictly adhering to ASTM A269, ASTM A213, ASME SA213, JIS G3459, and EN standards. Our export footprint spans the USA, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Accurate chemical calibration governs performance in high-pressure oil, gas, and chemical processes. Below is our baseline material analysis comparison table.
| Alloy Grade | UNS Designation | Chromium (Cr)% | Nickel (Ni)% | Molybdenum (Mo)% | Carbon (C)% Max | Tensile Strength (MPa) | Yield Strength (MPa) |
|---|---|---|---|---|---|---|---|
| SUS316 | S31600 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | 0.08 | ≥ 515 | ≥ 205 |
| SUS316L | S31603 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | 0.03 | ≥ 485 | ≥ 170 |
| Duplex 2205 | S32205 | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 0.03 | ≥ 655 | ≥ 450 |
| Alloy 825 | N08825 | 19.5 - 23.5 | 38.0 - 46.0 | 2.5 - 3.5 | 0.05 | ≥ 586 | ≥ 241 |
| Alloy 625 | N06625 | 20.0 - 23.0 | ≥ 58.0 | 8.0 - 10.0 | 0.10 | ≥ 827 | ≥ 414 |
Our coiled tubes are produced in a broad spectrum of outer diameters, ranging from ultra-thin 0.125 inch (3.175 mm) up to robust 1 inch (25.4 mm). Wall thickness limits extend up to 0.165 inch (3 mm), ensuring high burst-pressure performance across deepwater applications.
Using special cold-drawing pipelines combined with orbital butt-welding techniques, we provide uninterrupted coil lengths up to 32,800 feet (10,000 meters). Custom dimensional envelopes are adjusted precisely in accordance with client-specified bend radii, spooler configurations, and chemical composition modifiers.
We support B2B supply lines from the drawing board to installation, providing specialized post-processing services to optimize field performance.
We support various materials (e.g., 304, 316L, 2205) and custom specifications spanning diameter ranges from 6.35mm up to 19mm.
Includes high-precision bending, tight spiral coiling, concentric coiling, and precision drawing designed specifically for compact heat exchangers.
We utilize computer-controlled laser cutting, high-speed mechanical shearing, and non-distorting tube straightening for smooth downstream assembly.
Continuous integration of state-of-the-art bright annealing (BA) technology in a pure hydrogen atmosphere ensures scale-free, high-purity internal bores.
Used extensively in automotive exhaust lines, high-purity chemical connections, and heavy-duty instrumentation manifolds.
Our corrosion-resistant SUS316 coiled tubes operate reliably in highly critical commercial, maritime, and scientific environments.
Our factory quality control system operates according to international standards. Certified traceable materials protect your downstream operation.
Every spool of SUS316/SUS316L coiled tubing is subjected to a rigorous non-destructive evaluation (NDE) program. We conduct online hydrostatic pressure testing up to 1000 bar and high-resolution eddy current testing (ECT) to detect surface defects and micro-pores.
Mechanical verification testing includes flaring, flattening, elongation, tensile strength, and hardness profiling. All shipments are supplied with complete EN 10204 3.1 Mill Test Certificates (MTC), detailing chemical composition, heat number traceability, and physical test values.
Specialized duplex 2205 and austenitic alloy coiled tubing containing mixed ferrite-austenite microstructures for harsh deepwater installations.
Precision-drawn 1/2-inch stainless steel coiled tubing and hydraulic control line tubing with smooth internal walls and tight dimensional tolerances.
High-temperature resistant 310/310S grade stainless steel coil tubes engineered specifically for boilers, superheaters, and heat recovery generators.
Get answers to critical technical questions regarding the logistics, specifications, and applications of our SUS316 coiled tubing.
Our pricing structures are determined by raw alloy index values (specifically LME nickel and molybdenum prices) and order specifications. After you submit your detailed specifications (e.g., outer diameter, wall thickness, total length, testing requirements), our sales department will provide an updated, itemized quote valid for 30 days.
Yes, because of the production setup times required for custom cold-drawing and bright annealing, international orders have an ongoing minimum order quantity. For standard dimensions, the MOQ typically starts at 500 meters. Smaller trial quantities can be arranged if stock material exists on our shelves.
Yes, we provide comprehensive documentation packages with every shipment. This includes Certificates of Analysis/Conformance (compliant with EN 10204 3.1), marine insurance certificates, certificates of origin, packing lists, and export declarations. Specialized third-party test reports (SGS, TUV) are available upon request.
For standard stock samples, the lead time is approximately 7 days. For custom production runs, the lead time ranges from 20 to 30 days following the receipt of your advance payment deposit and final drawing approval. If you are working against tight installation deadlines, we can adjust our production planning to prioritize your schedule.
We accept wire transfers (T/T), Western Union, and PayPal. Our standard commercial terms are 30% advance deposit to initiate production, with the remaining 70% balance paid against the copy of the Bill of Lading (B/L). Irrevocable Letters of Credit (L/C) are accepted for large-scale procurement projects.
We provide a 12-month structural and metallurgical warranty covering materials and workmanship. If any tube fails due to manufacturing defects during standard operation, we will replace the material or issue a credit. Customer satisfaction and technical safety remain our primary priorities.
Yes. Coiled tubing is wound onto customized wooden, plastic, or steel reels, wrapped in protective moisture-barrier shrink film, and secured inside steel-reinforced crates. This heavy-duty export packaging prevents structural deformation and physical denting during transit. We also utilize specialized climate-controlled containers for high-purity, electropolished gas lines.
Shipping fees are determined by the gross weight, volume, and destination port of the shipment. Ocean freight is typically the most economical solution for large orders. For urgent requirements, air cargo can be arranged. We will provide detailed freight estimates based on current container market rates when quoting.
Below is the remainder of our specialized material inventory, including nickel alloys, connectors, and high-purity plate products.
