Sihe Steel
Sihe Steel
Engineered to exceed ASTM A269 and ASME SA269 specifications, our ultra-long seamless coiled tubes deliver peak durability for structural integrity.
High-precision capillary tubing designed for analytical instruments, chromatography, and control line systems requiring strict dimensional control.
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Offers superior yield strength and exceptional resistance to chloride stress corrosion cracking, ideal for marine and oilfields.
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Specially polished exhaust-grade tubing offering superior thermal performance and corrosion resistance for automotive systems.
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Precision engineered tubes providing high dimensional accuracy for hydraulic mechanisms and structural equipment applications.
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High-finish bright annealed tubes, offering exceptional cleanliness and corrosion resistance for sanitary line applications.
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Nickel-iron-chromium alloy tubing designed for high-stress sour gas environments and chemical oxidation resistance.
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Extreme performance super duplex coils. Features ultra-high strength and superb local corrosion resistance in sea water.
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Standard metric instrumentation-size coil tubing suitable for high-pressure control circuits and pneumatic systems.
Get Factory Direct QuoteIn high-integrity industrial fluid systems, material failure is not an option. Under ASTM A269/ASME SA269, requirements are defined for seamless and welded austenitic stainless steel tubing for general service. This standard mandates strict controls over chemical composition, mechanical properties, and grain microstructure, ensuring optimal performance across a wide operating temperature range.
For applications involving high pressure, cryogenic conditions, or highly corrosive chemicals, seamless coiled tubing is the preferred engineering solution. Cold drawing or cold rolling is utilized in the production of seamless coiled tubing to ensure a uniform microstructure, eliminating the risks of weld line failures or heat-affected zone (HAZ) corrosion associated with welded alternatives.
While ASTM A213 focuses primarily on boilers, superheaters, and heat-exchanger tubes (subject to strict creep-rupture testing), ASTM A269 offers more flexible dimensional parameters for general services, making it the industry standard for hydraulic control lines, subsea umbilical systems, chromatography lines, and petrochemical instrumentation.
Liaocheng Sihe Stainless Steel Material LTD specializes in the production of high-performance seamless coiled tubing in critical grades, including 304/304L, 316L, 321, 317L, 309S, 310S, and Incoloy 800. These products are fully compliant with GB, ASTM, ASME, JIS, and EN standards.
Analyzing market shifts in chemical, energy, and subsea applications under a demanding regulatory environment.
As offshore oil and gas exploitation moves into deeper, ultra-harsh waters, subsea umbilical systems face extreme environments. Mechanical properties must handle tremendous external pressures and temperatures. Our seamless coiled tubing, offered in Duplex 2205, Super Duplex 2507, and Incoloy 825, provides the corrosion resistance and high yield strength required to prevent catastrophic failures downhole.
The paradigm of Chinese steel manufacturing has shifted. Factory 4.0 production combines automated cold-drawing rigs with online induction bright annealing. By reducing human handling and using real-time laser monitoring, we produce long-length coils with dimensional consistency. This approach provides cost-effective logistics while meeting quality standards.
Global procurement directors require partners capable of weathering raw material fluctuations. Sihe maintains strategic raw material reserves of high-purity nickel and chromium alloys. By securing domestic supply channels, we offer lead time reliability, insulating international buyers from severe logistics disruptions.
| Alloy Grade | UNS Designation | PREN Value | Yield Strength (Mpa) | Recommended Industrial Applications |
|---|---|---|---|---|
| Austenitic 316L | S31603 | ≥ 23.1 | ≥ 220 | Chemical dosing, laboratory instrumentation, heat exchangers, HVAC systems |
| Duplex 2205 | S31803 / S32205 | ≥ 35 | ≥ 450 | Offshore oil and gas pipelines, high-chloride environments, paper mills |
| Super Duplex 2507 | S32750 | ≥ 42 | ≥ 550 | Subsea control lines, oilfield umbilicals, seawater desalination plants |
| Alloy 825 | N08825 | ≥ 32 | ≥ 230 | Sour gas (H2S) service, sulfuric and phosphoric acid processing plants |
| Alloy 625 | N06625 | ≥ 46 | ≥ 410 | Extreme temperature aerospace piping, marine engineering, exhaust valves |
For over ten years, Sihe Steel Group has set the standard in continuous coiled tubing technology.
Operating three specialized lines for stainless steel coil production alongside three additional drawing lines, we ensure steady capacity and rigorous quality control. The incorporation of advanced bright annealing technology enables continuous online softening. This process relieves cold-working stresses without altering the clean surface profile.
Our facility supports multiple testing procedures, including compression, flaring, bending, 100% hardness inspections, tensile elongation, and air-tightness verification. This comprehensive testing ensures that 80% of our production reliably serves global export markets, including the US, Germany, Spain, South America, and Southeast Asia.
Where failure is not an option: engineered coiled tubing designed for high-stress systems.
Providing value-added fabrication options to simplify installation and assembly.
We process stainless steel coils across diverse materials (304, 316L, 2205) and custom specifications, covering diameters from 6.35mm to 19mm to fit your design layout.
Our forming processes include continuous bending, spiral coiling, and high-precision cold drawing. These operations are tailored for heat-transfer configurations and space-constrained installations.
Laser cutting, high-speed abrasive wheel mechanical cutting, and flame processing ensure clean, square cuts, simplifying field orbital welding.
We offer bright annealing, chemical pickling, and mechanical polishing. These treatments minimize micro-roughness (Ra) and prevent process contamination.
Pre-formed flanged tube ends are available, facilitating reliable mechanical connection joints in automotive exhausts and chemical process lines.
Independent material testing and third-party certifications verifying raw material compliance.
Explore additional product specifications, surface finishes, and structural profiles from our factory stock.
Duplex 2205 stainless steel containing balanced austenitic and ferritic phases for robust corrosion protection.
1/2" seamless coiled tubing configuration suited for chemical injection and hydraulic lines.
High-temperature oxidation resistant 310/310S grade coils suitable for boiler and furnace gas paths.
Expert technical answers to key questions from international buyers, engineers, and supply chain managers.
Heavy-duty options engineered for extreme heat, high-purity processing, and corrosive downhole conditions.
Designed for downhole safety control valves and chemical injection systems operating under high-pressure conditions.
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High-strength sheets and plates featuring good weldability and forming characteristics for storage tanks.
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Features high hardness and wear resistance, suited for knives, valves, and high-stress mechanical components.
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Heavy-wall industrial tubes designed for hydraulic lines and instrumentation networks requiring high pressure limits.
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Molybdenum-bearing formulation offering improved resistance to pitting corrosion in sea water environments.
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Ferritic non-hardenable grade offering good corrosion resistance and formability, suited for home appliances.
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High-alloy heat-resistant tubes, designed to withstand continuous temperatures up to 1150°C without scaling.
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Super-alloy coiled tubing designed for high pitting, crevice, and intergranular corrosion resistance in severe environments.
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