Sihe Steel
Sihe Steel
Explore our core selection of precision stainless steel capillary tubing, coiled tubing, and specialized high-alloy components engineered for extreme environments.
Years of Coiled Tubing Production History
Advanced Precision Production Lines
Exporting Countries & Regions Globally
Hydrostatic & Non-destructive Tested
The global demand for high-precision microbore and capillary stainless steel tubing is undergoing a paradigm shift. Historically confined to basic laboratory instruments and refrigeration loops, contemporary applications demand unprecedented structural integrity and corrosion resistance. In particular, the rise of 316L (UNS S31603) as the global standard for critical applications highlights a significant trend toward life-cycle cost reduction and preventative failure engineering.
Today's smart industrial ecosystems require tubing that can withstand aggressive chemical exposure, high temperatures, and high pressures. This demand is prominent in the subsea oil and gas sectors, aerospace instrumentation, semiconductor manufacturing, and advanced green energy systems like hydrogen refueling stations.
Liaocheng Sihe Stainless Steel Material Ltd, a leader with over a decade of continuous technological innovation, stands at the intersection of these advancements. By integrating world-class bright annealing technology, we eliminate the oxide scale formations characteristic of standard thermal treatments, delivering ultra-smooth internal surfaces (ID) essential for laminar fluid dynamics and preventing micro-cavitation.
"The transition to deeper offshore extractions and harsher industrial processes demands materials that refuse to compromise. 316L capillary and coiled tubing, processed under controlled atmosphere annealing, represents the baseline for modern subsea control umbilical engineering."
Understanding the chemical composition and mechanical threshold differences of stainless steel variants and superalloys is critical to making informed procurement decisions.
| Alloy Grade | UNS Designation | Standards Compliance | Key Feature & Primary Application |
|---|---|---|---|
| 316L Stainless Steel | UNS S31603 | ASTM A269 / ASME SA269 / EN 1.4404 | Low carbon, high molybdenum. Excellent pitting resistance for marine and chemical systems. |
| 304 / 304L | UNS S30400 / S30403 | ASTM A269 / EN 1.4301 | Versatile corrosion resistance. Highly economical for HVAC, instrumentation, and food processing. |
| Duplex 2205 | UNS S31803 / S32205 | ASTM A789 / EN 1.4462 | High yield strength. Exceptional resistance to chloride stress corrosion cracking (SCC). |
| Super Duplex 2507 | UNS S32750 | ASTM A789 / EN 1.4410 | Extremely high pitting resistance (PREN > 40). Designed for high-salinity subsea umbilical environments. |
| Incoloy 825 | UNS N08825 | ASTM B163 / ASME SB163 | High nickel content. Unparalleled resistance to oxidizing and reducing acids, especially sulfuric and phosphoric. |
| Inconel 625 | UNS N06625 | ASTM B444 / ASME SB444 | Nickel-Chromium-Molybdenum-Columbium alloy. Superior strength and fatigue resistance up to 982°C. |
Global procurement teams prioritize logistical predictability, compliance with local codes (JIS, DIN, EN, ASTM), and robust physical testing documentation.
China's industrial integration enables factories to secure raw material alloys (BaoSteel, TISCO) quickly, keeping production cycle times under 30 days.
With OD capabilities spanning 0.125” to 1.0” and ultra-long seamless coils up to 32,800 feet (10,000 meters), custom specs are easily met.
In the global market, cost-efficiency cannot exist at the expense of quality. Liaocheng Sihe Stainless Steel Material Ltd operates as a model for smart metallurgy manufacturing (Factory 4.0). By implementing advanced online bright annealing technology directly on our production lines, we reduce energy overhead while improving metallurgical consistency.
Our processing setup includes inline sizing calibration, high-resolution eddy current testing systems, and automated laser dimension controls. This high degree of automation ensures that our coiled capillary tubing maintains tight wall thickness and outer diameter tolerances across extensive continuous lengths.
Furthermore, our geographic position within Liaocheng, China's central steel manufacturing hub, allows us to mitigate supply shocks. We maintain close strategic partnerships with major domestic mills, ensuring stable pricing and continuous raw material delivery. As global supply chains face uncertainty, our structure provides a reliable alternative with predictable transit times and highly competitive pricing models.
We provide comprehensive downstream fabrication services, turning standard capillary tubing into plug-and-play assemblies for specialized projects.
Custom processing supports complex 3D bending geometry, spiral coil profiling, and compact space designs for high-efficiency heat exchangers.
Laser and high-speed mechanical cutting ensure burr-free cuts, accurate length tolerances, and optimal interior channel integrity.
End configurations including flared, swaged, and flanged profiles to simplify integration into hydraulic and exhaust setups.
Our capillary and coiled tubing is deployed across demanding global industries where system failure is not an option.
Enables highly efficient thermal exchange inside compact marine and industrial boilers.
Durable capillary expansion lines that prevent refrigerant leakage and handle vibration stress.
Corrosion-resistant tubing designed to handle aggressive media and precise chemical dosing.
Ultra-clean, bright-annealed interior surfaces that prevent batch contamination and biological buildup.
Quality is verified by international inspection bodies. Explore our certified quality management documentation.
To ensure failure-free deployment in extreme environments like deep-sea subsea oil wells, we subject our products to rigorous testing. Our QA lab performs 100% hydrostatic and pneumatic air-tightness testing, hardness profiling, flaring/expansion tests, and micro-structural analysis. Every shipment includes certified mill test reports (MTR) according to EN 10204 3.1, tracing the physical properties and chemistry of each production heat back to the raw material melt.
In deep offshore oil and gas extraction, downhole safety valves and chemical injection systems operate under extreme hydrostatic pressures and high temperatures. Control lines constructed from our 316L, Duplex 2205, and Inconel 625 coiled tubing offer a seamless fluid pathway that prevents leaks over long subsea links. By manufacturing continuous lengths up to 32,800 feet (10,000 meters) without orbital butt welds, we eliminate local heat-affected zones (HAZ) where stress-corrosion cracking typically begins.
In the aerospace industry, weight savings and pressure integrity are paramount. Our ultra-thin-walled capillary tubes serve as high-pressure sensor lines, carrying hydraulic fluids and volatile gases through thermal zones without structural failure. In analytical sciences, such as Gas Chromatography (GC) and High-Performance Liquid Chromatography (HPLC), the inner surface of our tubing is polished to prevent sample carryover, ensuring highly repeatable measurements for laboratory instruments.
Get professional, engineering-focused answers regarding technical specifications, procurement logistics, and testing protocols.
316L (UNS S31603) contains 2.0% to 3.0% molybdenum, which significantly improves resistance to localized chloride pitting and crevice corrosion compared to 304. The "L" indicates low carbon content (less than 0.03%), which prevents carbide precipitation during welding and high-temperature thermal cycling, preserving corrosion resistance along weld zones.
We manufacture continuous, weld-free coiled tubing lengths up to 32,800 feet (10,000 meters), depending on the outer diameter and wall thickness. This long length is ideal for subsea control lines and umbilical systems, reducing the need for orbital welds and lowering potential leak risks.
Our manufacturing processes comply with ASTM (e.g., ASTM A269, ASTM A213, ASTM A789), ASME, JIS (Japanese Industrial Standards), and EN (European Standards). All materials are fully tested and certified before shipping.
Every production run undergoes 100% hydrostatic and pneumatic air-tightness testing. We also perform mechanical testing, including flaring, flattening, reverse-bending, tensile strength, and hardness tests, as well as non-destructive eddy current testing to ensure zero defects.
Prototype and sample production typically takes 7 days. For mass production orders, the standard lead time is 20 to 30 days after receipt of deposit and final technical sign-off. We work closely with our logistics partners to accommodate urgent production deadlines.
Yes, we provide full quality documentation with every order. This includes Certificates of Analysis/Conformance (EN 10204 3.1 Mill Test Certificate), raw material trace certificates, Certificate of Origin, and export documentation.
Yes. While our standard outer diameter sizes range from 0.125 inch (3.175 mm) to 1 inch (25.4 mm) with wall thicknesses up to 3 mm, we can customize dimensions to meet your specific project requirements.
We accept bank wire transfers (T/T), Western Union, and PayPal. Our typical payment terms are a 30% deposit in advance, with the remaining 70% balance paid upon presentation of the copy of the Bill of Lading (B/L).
Complete your procurement requirements by browsing our wider selection of coiled control lines, structural tubes, and heat exchanger components.
