Sihe Steel
Sihe Steel
Discover our comprehensive collection of industrial stainless steel pipes, capillary tubes, and coiled configurations designed for extreme temperatures, high pressures, and corrosive media.
Over the last decade, Liaocheng Sihe Stainless Steel Material Ltd has established itself as an industry leader in manufacturing high-quality stainless steel coiled tubing, precision polished tubes, and ultra-long seamless pipes. Operating with six state-of-the-art production lines, we adhere to strict international production standards: GB, ASTM, ASME, JIS, and EN.
We work with premium steel grades, including 304/304L, 316L, 321, 317L, 309S, 310S, and Incoloy 800, along with special alloys like Austenitic 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625. Our continuous coiled tubing is available in outer diameters from 0.125 inches (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inches (3 mm) and single coil lengths reaching up to 32,800 feet (10,000 meters).
Driven by the demands of complex subsea installations and aggressive chemical environments, we focus on engineering the right corrosion-resistant materials to enhance safety and project longevity worldwide.
Positioning 304L stainless steel at the center of modern industrial transformations, from carbon-neutral energy grids to subsea drilling operations.
As extraction moves into deeper, ultra-harsh environments, the threat of chloride stress corrosion cracking increases. Our 304L and duplex coiled umbilical tubings offer structural integrity under immense external pressures, ensuring safe chemical injection and hydraulic control lines.
Transitioning to clean energy requires infrastructure capable of transporting cryogenic media like liquefied natural gas (LNG) and liquid hydrogen. The low carbon content in 304L prevents grain boundary sensitization during welding, preserving structural toughness down to cryogenic temperatures.
With 80% of our products exported to Western markets, we maintain reliable supply logistics. We combine advanced domestic production capacities in China with global trade standards, providing quality control paperwork and prompt dispatch services.
Understanding the difference: Why 304L (Low Carbon) outperforms standard 304 in high-temperature, welded, and corrosive applications.
The principal difference between standard 304 and 304L stainless steel lies in the carbon content. By keeping carbon levels below 0.03%, 304L prevents sensitization—the precipitation of chromium carbides at grain boundaries during welding. This helps preserve the chromium content throughout the heat-affected zone, ensuring long-term resistance to intergranular corrosion.
| Element / Composition % | Carbon (C) | Chromium (Cr) | Nickel (Ni) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|---|---|
| 304 (UNS S30400) | ≤ 0.08 | 18.0 - 20.0 | 8.0 - 10.5 | ≤ 2.0 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 |
| 304L (UNS S30403) | ≤ 0.03 | 18.0 - 20.0 | 8.0 - 12.0 | ≤ 2.0 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 |
Mechanical Performance Characteristics of 304L:
We pair historical manufacturing experience with high-tech processing capabilities to deliver high-integrity steel solutions:
Tailoring chemical composition, geometrical precision, and mechanical properties to meet demanding customer specifications.
We work with various materials (such as 304, 316L, 2205) and offer tailored outer diameters (6.35 mm to 19 mm) to supply custom-designed stainless steel coils.
We offer precise tube bending, tight-radius spiral forming, and precision drawing, producing optimized coils for heat exchangers and hydraulic applications.
Using advanced laser cutting, mechanical abrasive cutting, and automated roller straightening machinery, we achieve burr-free end cuts and linear precision.
We provide chemical passivation, electro-polishing, and mechanical polishing, enabling clean inner and outer tube surfaces that minimize fouling and biological growth.
We offer specialized flanging and end-forming services, producing reliable mechanical connections for automotive exhaust systems and chemical processing lines.
Providing specialized tubing configurations to meet the distinct engineering requirements of heavy industries.
Our commitment to quality is backed by international verification documents and certification protocols.
We supply products accompanied by comprehensive documentation, including Mill Test Certificates (MTC) according to EN 10204 3.1, Certificates of Analysis (COA), Certificate of Conformance (COC), and export origin documents. This ensures complete traceability from the initial melting process to final delivery.
Providing a broad selection of steel grades and product types optimized for industrial applications.
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VIEW MOREInnovating to support next-generation metallurgy, emission reductions, and clean energy storage.
We are reducing the environmental footprint of our annealing furnaces by adopting hybrid electric-hydrogen heating systems, helping to lower carbon emissions throughout our processing operations.
Driven by semiconductor and HPLC requirements, we are refining our draw-bench technology to achieve an internal surface roughness (Ra) below 0.2 micrometers, eliminating microscopic pits that can harbor contamination.
To support high-temperature and highly acidic environments, we are expanding our production of nickel-based alloys like Inconel 625 and Incoloy 825, providing reliable materials for deep geothermal and offshore drilling fields.
Frequently asked questions regarding material selection, ordering, and delivery logistics.
Choose from our selection of premium stainless steel grades, high-purity capillary tubing, and heat-resistant piping solutions.
