Sihe Steel
Sihe Steel
Explore our premium factory-direct coiled tube products optimized for extreme industrial environments and high-precision fluid instrumentation.
For over a decade, we have pioneered the development and high-precision manufacturing of austenitic and duplex stainless steel coiled tubing. Equipped with six advanced production lines and world-class online bright annealing technology, we consistently meet the most rigorous demands of international engineering projects.
Our facility strictly adheres to globally recognized manufacturing standards, including GB, ASTM, ASME, JIS, and EN. We specialize in processing high-performance steel grades such as 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Austenitic 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
Standardization is key, but adaptability drives modern engineering. Our coiled tubing is engineered to cover a wide spectrum of sizes and wall thicknesses to ensure perfect integration into your complex assemblies.
A comprehensive breakdown of metallurgy, supply chains, compliance, and how global enterprises benefit from optimization.
Grade 304 is the classic 18/8 austenitic stainless steel. Containing approximately 18% chromium and 8% nickel, it offers excellent corrosion resistance, high ductility, and exceptional formability. When drawn into continuous coiled configurations, 304 stainless steel exhibits excellent mechanical properties suited for structural and hydraulic networks.
For critical applications involving welding or elevated operational temperatures, we recommend 304L (Low Carbon), which prevents sensitization to intergranular corrosion by avoiding chromium carbide precipitation along the grain boundaries.
Sourcing directly from Chinese manufacturers like Liaocheng Sihe offers crucial strategic benefits:
International procurement directors must balance total cost of ownership (TCO) with system integrity. Continuous 304 coiled tubing dramatically lowers installation costs. By eliminating multiple mechanical fittings and orbital joint welds:
Review key mechanical properties and chemical compositions of our primary steel products to match your design requirements.
| Steel Grade | UNS Designation | Carbon content (Max %) | Chromium (%) | Nickel (%) | Yield Strength (Mpa, Min) | Primary Industrial Use Case |
|---|---|---|---|---|---|---|
| 304 Stainless Steel | S30400 | 0.08 | 18.0 - 20.0 | 8.0 - 10.5 | 205 | Heat exchangers, general instrumentation, process pipelines. |
| 304L Stainless Steel | S30403 | 0.03 | 18.0 - 20.0 | 8.0 - 12.0 | 170 | Welded systems, chemical injection, offshore lines. |
| 316L Stainless Steel | S31603 | 0.03 | 16.0 - 18.0 | 10.0 - 14.0 | 170 | Marine structures, medical instrumentation, harsh environments. |
| Duplex 2205 | S31803 / S32205 | 0.03 | 21.0 - 23.0 | 4.5 - 6.5 | 450 | Deepwater oil/gas subsea completions, high-pressure umbilicals. |
| Super Duplex 2507 | S32750 | 0.03 | 24.0 - 26.0 | 6.0 - 8.0 | 550 | High chloride environments, desalinization, subsea manifolds. |
Our commitment to rigorous QA/QC processes is backed by international certifications and extensive test protocols.
We carry out comprehensive internal tests, including compression, flaring, bending, 100% hardness evaluation, tensile strength assessment, and high-pressure air tightness testing. These tests ensure our coils function reliably under demanding load and marine conditions.
We provide full-spectrum engineering customization to streamline assembly at your integration facility.
We support various premium grades (304, 316L, 2205) and technical specifications spanning outer diameters from 6.35mm to 19mm to suit customized system configurations.
Equipped for custom bending, complex spiral forming, and precision cold drawing. Optimized for immediate installation in high-efficiency heat exchangers.
We utilize precision laser cutting, clean mechanical cutting, and thermal flame cutting for dimensional accuracy and clean burr-free ends.
Proprietary online bright annealing preserves clean surface finishes, maximizing resistance to local pitting and uniform corrosion.
Ensures robust flange and end preparation, which is vital for connecting automotive exhaust networks, chemical lines, and precision instruments.
See how Liaocheng Sihe coiled tubing delivers reliability across critical global industrial sectors.
Continuous coils maximize heat transfer efficiency and eliminate internal joint risk.
Protects against refrigerant leakage under high operational vibration and cycling.
Safely guides corrosive fluids through industrial reaction loops and transfer pipelines.
Polished interiors preserve strict hygiene and prevent product accumulation.
Engineered to meet cleanroom standards for biological processing and fluid transit.
Superheated steam handling and cooling line applications under high pressure.
Excellent durability under deepwater chemical injection and hydraulic controls.
High strength-to-weight ratio tubing for exhaust loops and hydraulic lines.
Deepening international partnerships and leading technological breakthroughs in coiled pipe production.
As oil and gas extractions move into deeper and harsher waters, extreme offshore environments demand absolute safety. Our mission is to help you select the optimal corrosion-resistant materials for coiled umbilical tubing, improving the reliability of your installations.
We prioritize customer requirements and strive to satisfy project-specific specifications. Liaocheng Sihe Stainless Steel Material Limited Company has served the industry for a decade, selling products to over 30 countries and regions, including the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe. Today, approximately 80% of our production volume is exported worldwide.
Explore the full breadth of our stainless steel and alloy manufacturing capabilities.
2205 duplex stainless steel containing austenitic and ferritic microstructures.
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1/2" stainless steel coiled tubing engineered for fluid instrumentation systems.
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High temperature oxidation resistant 310 steel coiled tubing for boilers.
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Custom dimensions engineered for chemical injection and hydraulic lines.
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High dimensional accuracy instrumentation tubes for control systems.
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Corrosion resistant alloy tubing designed for harsh offshore environments.
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Super long continuous tubing coils for subsea umbilical networks.
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ASTM compliant seamless stainless steel tubes with polished surface finishes.
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Austenitic and super duplex grade coils custom manufactured to length.
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Online bright annealed tubing designed to optimize mechanical ductility.
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High-pressure hydraulic instrumentation tubing designed for subsea control lines.
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Durable heat exchanger tubes suited for demanding chemical processing units.
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Premium heat exchanger coil tubes optimized for thermal transfer efficiency.
View More ProductCritical purchasing insights and operational parameters for international procurement teams.
Direct factory access for critical projects requiring precise dimensions and high alloy consistency.
