Sihe Steel
Sihe Steel
Precision-engineered solutions manufactured under strict international certifications (ASTM, ASME, JIS, DIN, EN) for subsea, aerospace, and processing industries.
Established as an industry-leading manufacturer in China, Liaocheng Sihe Stainless Steel Material LTD operates six state-of-the-art production lines dedicated exclusively to high-performance alloy fabrication. We specialize in the high-precision processing and engineering of stainless steel coiled tubes, capillary lines, bright annealed polished tubes, and ultra-long seamless coiled pipelines.
Our facility implements the world's most advanced Online Bright Annealing (BA) technology, resolving internal stresses and achieving grain boundary structural stabilization on the fly. This results in superior mechanical integrity, exceptional corrosion resistance, and mirror-finished inner and outer surfaces crucial for sensitive fluid handling systems.
The shifting paradigm of global infrastructure demands high-durability, corrosion-resistant austenitic alloys that withstand challenging operating environments.
With the global transition to green energy, 304 and 316L stainless steel pipes have become essential components in solar thermal plants, biomass processing installations, and carbon capture machinery. Their resistance to high operating temperatures and aggressive chemical solvents guarantees structural stability over decades of continuous operation.
As offshore oil and gas drilling moves into ultra-deep waters, the extreme environment demands specialized umbilical lines. Super Duplex 2507, Incoloy 825, and Inconel 625 alloys are integrated into complex subsea manifolds to guarantee leakproof control lines under high hydrostatic pressure, preventing costly catastrophic failures.
Chinese manufacturers have embraced automation to boost supply chain resilience. Through integrated manufacturing networks, computerized cold-drawing, automated annealing furnaces, and inline eddy current testing, we ensure that every batch meets rigorous tolerances while keeping pricing highly competitive.
A comparative analytical reference of popular austenitic and duplex alloys manufactured at our facilities.
| Alloy Grade | UNS Designation | Chromium (Cr) % | Nickel (Ni) % | Molybdenum (Mo) % | Carbon (C) % Max | Yield Strength (Mpa) Min |
|---|---|---|---|---|---|---|
| TP304 / 304L | S30400 / S30403 | 18.0 - 20.0 | 8.0 - 12.0 | - | 0.08 / 0.030 | 205 / 170 |
| TP316 / 316L | S31600 / S31603 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | 0.08 / 0.030 | 205 / 170 |
| Duplex 2205 | S31803 / S32205 | 21.0 - 23.0 | 4.5 - 6.5 | 2.5 - 3.5 | 0.030 | 450 |
| Super Duplex 2507 | S32750 | 24.0 - 26.0 | 6.0 - 8.0 | 3.0 - 5.0 | 0.030 | 550 |
| Incoloy 825 | N08825 | 19.5 - 23.5 | 38.0 - 46.0 | 2.5 - 3.5 | 0.05 | 240 |
| Inconel 625 | N06625 | 20.0 - 23.0 | 58.0 Min | 8.0 - 10.0 | 0.10 | 415 |
Our machinery is calibrated to produce custom configurations. We can design and deliver custom specifications within the following standard dimensions:
At Liaocheng Sihe, quality assurance is integrated into every phase of production. We run advanced dimensional and structural testing to ensure our coiled tubes perform reliably in harsh high-pressure environments.
How global raw material markets, manufacturing processing, and logistics affect final prices.
Because 304 and 316L stainless steel are rich in nickel and chromium, international pricing is closely tied to London Metal Exchange (LME) spot rates. Fluctuations in these primary alloying elements directly impact base material costs. We offer flexible hedging strategies and long-term contracts to help our partners manage price volatility.
High-precision processing, such as sub-micron surface polishing, bright annealing, or producing single continuous 10,000m coils, incurs processing surcharges. These processes require specialized tooling and longer production times, which are calculated into the final quote.
Shipping continuous coils requires robust, custom packaging to prevent deformation. We use heavy-duty steel and wooden drums with internal braces to protect tubes during transport. Our logistics department coordinates ocean, rail, and multimodal shipping to optimize transit times and minimize costs.
We support custom fabrication requirements, transforming raw tubing into installation-ready components.
We offer custom precision coiling, spiral forming, and complex multi-axis bending for specialized heat exchangers and condensers. Our modern CNC bending machinery ensures consistent tube geometry without flattening or wall thinning.
Equipped with state-of-the-art laser cutting systems and rotary straightening machines, we deliver precise tube lengths with clean, burr-free square cuts. This ensures consistent fits and reliable automated orbital welding in high-purity piping systems.
We offer custom pre-formed flared ends, flanged connections, and swaged end-reductions to simplify integration into hydraulic manifolds, automotive exhaust systems, and chemical process lines.
Our products are engineered to perform reliably across demanding industrial applications.
Our factory and products undergo audit processes to comply with global engineering and safety regulations.
Frequently asked questions and technical details for international buyers and engineers.
Explore our full line of corrosion-resistant capillary tubes, coiled tubing, and specialty alloys.
We manufacture a broad range of alloy products tailored to specific pressure and temperature requirements.
Duplex 2205 is an austenitic-ferritic duplex stainless steel that combines high strength with excellent resistance to stress corrosion cracking.
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Standard 1/2 inch coiled tubing manufactured in continuous lengths to minimize connection points and potential leak paths.
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High-temperature resistant 310 series stainless steel tubing designed for thermal processing and furnace applications.
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As subsea oil and gas extractions move into deeper, harsher waters, offshore environments demand extreme safety and reliability. Our goal is to help you select the right corrosion-resistant materials for coiled umbilical tubing, ensuring the safety and longevity of your operations.
This focus drives our engineering innovations and continuous facility upgrades. We prioritize our customers' specifications and requirements, offering customized solutions for chemical injection lines, hydraulic control lines, and subsea distribution systems.
"With over ten years of manufacturing experience, Liaocheng Sihe is a trusted supplier of high-precision stainless steel tubing, exporting to over 30 countries across the Americas, Europe, and Asia."
