Sihe Steel
Sihe Steel
Direct supply from Liaocheng Sihe factory, matching international production standards for high-stress applications.
Established as a benchmark of metallurgical precision in China, Liaocheng Sihe Stainless Steel Material LTD operates six advanced production lines. We are specialized in the production of high-grade stainless steel coiled tubes, precision polishing tubes, and seamless coiled tubing designed for high-stress applications.
Our production capabilities conform strictly to global criteria: GB, ASTM, ASME, JIS, and EN standards. We manage a robust metallurgical selection including 304/304L, 316L, 321, 317L, 309S, 310S, alongside premium nickel alloys such as INCOLOY 800, 825 and INCONEL 625. With over ten years of specialized manufacturing history and dedicated coil production infrastructures, we deliver high performance, dimensional reliability, and corrosion resistance.
Our core alloy range spans from austenitic steels to complex Duplex and Super Duplex classes, including Duplex 2205 and Super Duplex 2507. These materials are heavily demanded in demanding environments such as military, semiconductor processing, biotechnology, precision instruments, petrochemical processes, marine engineering, and heat exchangers.
Our coiled tubing solutions are offered in outer diameters ranging from 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inch (3 mm). For critical umbilical system manufacturing, we can supply continuous lengths up to 32,800 feet (10,000 meters). This significantly minimizes the risk of weld seam failures in offshore oil and gas drilling operations.
A comprehensive analysis of austenitic, duplex, and nickel-alloy stainless steel sheets and tubes under high-stress conditions.
Austenitic grades (such as 304, 316L, 321) feature a face-centered cubic (FCC) crystal structure, providing excellent ductility, toughness, and non-magnetic properties. By keeping carbon levels low in our "L" variants (e.g., 316L), we prevent chromium carbide precipitation at grain boundaries during welding. This mitigates intergranular corrosion when exposed to aggressive chemical media.
Duplex 2205 and Super Duplex 2507 utilize a balanced 50:50 ratio of austenite and ferrite. This dual microstructure offers double the yield strength of standard austenitic alloys, along with high resistance to chloride stress corrosion cracking (SCC). With a Pitting Resistance Equivalent Number (PREN) exceeding 40 for Super Duplex, these materials resist localized pitting and crevice corrosion.
Our Incoloy 800/825 and Inconel 625 alloys are designed for extreme thermal and corrosive challenges. Incoloy 800 resists oxidation and carburization at elevated temperatures. Inconel 625, alloyed with molybdenum and niobium, provides excellent mechanical stability from cryogenic ranges up to 982°C. This makes it ideal for offshore piping, aerospace exhausts, and chemical processing.
At Liaocheng Sihe, we use Bright Annealing (BA) processes in a controlled hydrogen atmosphere to prevent oxidation and scale formation. This method retains a highly reflective finish while relieving internal stresses from cold-drawing. Every batch undergoes non-destructive evaluation (NDE), including online eddy current and ultrasonic testing. This process detects micro-fissures and wall-thickness anomalies, ensuring complete compliance with ASTM and EN manufacturing specifications.
In the modern metal processing sector, manufacturing consistency determines long-term project success. Liaocheng Sihe combines smart manufacturing platforms with high-output machinery to manage demanding orders without sacrificing tolerance limits. Our online annealing processes are monitored by digital control systems. These systems maintain heat consistency to prevent grain growth and ensure uniform mechanical properties.
With our six specialized production lines, we offer stable supply chains despite shifting global raw material markets. Sourcing directly from our factory in China provides significant advantages:
How our high-grade stainless steel products serve critical sectors across marine engineering, power plants, and semiconductor lines.
Explore our core product ranges designed to meet standard and customized industrial requirements.
Manufactured in Duplex 2205, Super Duplex, and austenitic grades for high-pressure control lines.
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Precision capillary tubes from 0.125 inch to 1 inch outer diameter, holding tight dimensional tolerances.
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Specialized high-temperature and oxidation-resistant alloys tailored for boiler and heat exchanger coils.
VIEW MORE PRODUCTDelivering production-ready components that seamlessly integrate into your assembly line.
We process various materials (including 304, 316L, and 2205) in custom coiled configurations with outer diameters ranging from 6.35 mm to 19 mm.
Includes high-precision bending, spiral forming, and precision drawing, optimized for marine umbilical applications and high-efficiency heat exchangers.
Laser cutting, mechanical slicing, and flame cutting. We hold exact tolerances to ensure optimal material utilization for downstream fabrication.
We use automated polishing and bright chemical pickling lines to deliver a clean internal surface finish, minimizing fluid drag and contamination risks.
Precision end flanging designed for automotive exhaust manifolds, high-pressure chemical transfer pipelines, and micro-instrument connections.
Liaocheng Sihe is committed to strict compliance and third-party verification, meeting demanding quality inspection requirements.
Pioneering advancements in low-emission steel production, precision rolling, and digital alloy design.
As environmental regulations tighten globally, we are optimizing our production workflows to reduce carbon emissions. By partnering with low-carbon smelting operations and recycling high-grade scrap, we supply stainless steel sheets with a smaller environmental footprint. We continue to improve our processing lines to reduce energy consumption per ton while maintaining high metallurgical standards.
Our technology roadmap includes integrating artificial intelligence into our non-destructive testing (NDT) workflows. In addition to standard eddy current tests, automated laser sensors track dimensional tolerances on the line. This allows us to catch micro-defects early, ensuring that only high-quality material reaches our customers.
With the growth of hydrogen fuel cells and high-pressure liquid chromatography (HPLC), we are expanding our capabilities in ultra-thin wall capillary tubing. Our ongoing development projects aim to achieve uniform wall thicknesses down to 0.1 mm in specialized alloys like Inconel 625, helping to prevent hydrogen embrittlement under extreme pressures.
When purchasing industrial stainless steel materials, ensure your supplier provides:
Clear, direct answers regarding specifications, minimum order quantities, lead times, and global shipping policies.
Explore our full range of specialty heat exchanger pipes, precision capillaries, and chemical-grade sheets.
