Sihe Steel
Sihe Steel
Explore our industrial-grade, heavy-duty stainless steel encapsulated tubes, control lines, and capillary tubes manufactured under stringent international guidelines.
Analyzing critical operational requirements for offshore extraction and subsea injection systems.
Global procurement teams in the oil and gas sectors prioritize stress-corrosion cracking (SCC) resistance. High chloride environments combined with temperatures up to 200°C demand robust solutions such as Duplex 2205, Super Duplex 2507, and high-nickel alloys like Inconel 625 and Incoloy 825.
To eliminate subsea mechanical connection failures, we specialize in manufacturing single, orbital-weldfree continuous lengths of up to 32,800 feet (10,000 meters). This drastically simplifies deployment in subsea control lines and downhole chemical injection umbilicals.
Outer protective layers made of high-grade polymers (Nylon, PVDF, FEP) safeguard the inner metallic tube from external mechanical wear, abrasive sea-floor movement, marine biology, and corrosive elements, extending operational life cycles to over 30 years.
A reference table for engineers selecting tubing grades based on specific operational stress profiles.
| Steel Grade | UNS designation | Yield Strength (Mpa) | PREN (Pitting Resistance) | Primary Industrial Application |
|---|---|---|---|---|
| Austenitic 316L | S31603 | ≥ 220 | 23 - 25 | Semiconductor, pharmaceuticals, chemical dosing, hydraulic lines |
| Duplex 2205 | S32205 / S31803 | ≥ 450 | 35 - 38 | Offshore platform instrumentation, downhole completions |
| Super Duplex 2507 | S32750 | ≥ 550 | ≥ 42 | Deep-water umbilical systems, high pressure injection |
| Incoloy 825 | N08825 | ≥ 240 | 31 - 33 | Sour gas production wells, high sulfide stress cracking protection |
| Inconel 625 | N06625 | ≥ 415 | ≥ 45 | Extreme subsea umbilical fields, aerospace, high temperature gas valves |
Decades of fabrication expertise delivering high-performance metallic coiled pipes globally.
Liaocheng sihe stainless steel material LTD strictly follows production standards including GB, ASTM, ASME, JIS, and EN. Our facilities implement the world's first-class bright annealing technology, allowing online stainless steel pipe softening treatment to optimize tensile properties, flexibility, and fatigue limits.
Liaocheng sihe stainless steel material LTD excels in producing premium-grade stainless steel coiled tubes, seamless coiled tubing, and precision polishing tubes. Our materials find high utilization in military applications, semiconductors, pharmaceutical biotechnology, aerospace engineering, automotive components, and marine shipbuilding plants.
Our strategic manufacturing processes ensure that sizes arranging from an outer diameter of 0.125 inches (3.175 mm) to 1 inch (25.4 mm) are perfectly drawn, with wall thicknesses reaching up to 0.165 inches (3 mm). Special customized dimensions are continuously handled to match local and international customer guidelines.
End-to-end metallurgical operations configured to fulfill unique architectural and flow design requirements.
We support various materials (e.g., 304, 316L, 2205) and custom specifications ranging from diameter 6.35mm to 19mm for seamless stainless steel coils.
Our facility carries out precision drawing, bending, and specialized spiral forming tailored strictly for heat exchangers and hydraulic actuators.
We use state-of-the-art laser cutting, high-efficiency mechanical cutting, and flame cutting to deliver clean edges and precise length distributions.
Continuous online bright annealing (BA) and internal mechanical polishing optimize surface roughness, preventing scaling and particle buildup.
Highly utilized in automotive exhaust systems, chemical pipelines, and precision instrumentation connections to guarantee leak-proof seals.
We perform compressed air tests, flaring/bending assessments, tensile/hardness checks (100% verification), and air-tightness pressure trials.
Seamlessly integrated within major global infrastructures requiring high-integrity containment and transport.
Liaocheng Sihe ensures full compliance with international classification organizations and quality protocols.
How we are engineering the next generation of encapsulated capillary and coiled umbilical technologies.
As offshore exploration advances into ultra-deep horizons (exceeding 3,000 meters / 10,000 feet subsea), the hydrostatic pressures acting on umbilical lines escalate rapidly. Liaocheng Sihe is designing high-wall-thickness variants (up to 3mm) in alloy 625 and duplex grades that offer high collapse resistance under severe external ocean forces.
Hydrogen embrittlement represents a critical risk for metal conduits downhole. We are expanding research into custom internal surface passivation layers and ultra-low carbon formulations to limit grain boundary precipitation, preserving high mechanical toughness even when exposed to continuous wet H2S (sour service) and high-concentration gaseous hydrogen.
Explore our extensive range of seamless, welded, and capillary coil tubing products configured for general and specialized piping projects.
Get instant answers regarding international ordering terms, metallurgy, certifications, and shipping.
Our prices are subject to change depending on supply and other market factors. We will send you an updated price list after your company contact us for further information.
Yes, we require all international orders to have an ongoing minimum order quantity. If you are looking to resell but in much smaller quantities, we recommend you check out our website.
Yes, we can provide most documentation including Certificates of Analysis / Conformance; Insurance; Origin, and other export documents where required.
For samples, the lead time is about 7 days. For mass production, the lead time is 20-30 days after receiving the deposit payment. The lead times become effective when (1) we have received your deposit, and (2) we have your final approval for your products. If our lead times do not work with your deadline, please go over your requirements with your sale. In all cases we will try to accommodate your needs. In most cases we are able to do so.
You can make the payment to our bank account, Western Union or PayPal: 30% deposit in advance, 70% balance against the copy of B/L.
We warranty our materials and workmanship. Our commitment is to your satisfaction with our products. In warranty or not, it is the culture of our company to address and resolve all customer issues to everyone's satisfaction.
Yes, we always use high quality export packaging. We also use specialized hazard packing for dangerous goods and validated cold storage shippers for temperature sensitive items. Specialist packaging and non-standard packing requirements may incur an additional charge.
The shipping cost depends on the way you choose to get the goods. Express is normally the quickest but also most expensive way. By seafreight is the best solution for big amounts. Exact freight rates we can only give you if we know the details of amount, weight and way. Please contact us for further information.
