Sihe Steel
Sihe Steel
Direct from our state-of-the-art cold rolling and drawing facility. Compliance certified with ASTM, EN, JIS, and GB international guidelines.
Rooted in Shandong, China, Liaocheng Sihe Stainless Steel Material LTD represents the cutting edge of domestic manufacturing in cold-rolled precision alloys, high-performance coiled tubes, and complex structural industrial tubing. Supported by six advanced production lines, our industrial facility specializes in delivering ultra-long seamless coiled tubing and corrosion-resistant alloys built to satisfy strict global demands.
We execute precise operations under international metallurgical protocols, guaranteeing that every batch leaves our plant in compliance with GB, ASTM, ASME, JIS, and EN specifications. From standard austenitic configurations to super-alloys designed for severe offshore corrosion, our product profile includes:
Whether deploying solutions in subsea oil exploration, deep geothermal wells, nuclear systems, or high-purity biopharmaceutical pipelines, we engineer our cold-rolled solutions to prioritize structural reliability, tight dimensional tolerances, and high purity surface finishes.
Integrating online induction annealing, precise dimensional control, and full integrity testing to produce reliable cold-rolled alloys.
We deliver continuous seamless coils in lengths reaching up to 32,800 feet (10,000 meters) without orbital welds. This production capacity enables continuous integration into umbilical cables for subsea oil and gas, minimizing leakage points and mechanical weak links.
Our drawing benches and sizing equipment handle outer diameters from 0.125 inches (3.175 mm) up to 1.0 inch (25.4 mm). We process wall thicknesses up to 0.165 inches (3 mm) to hold high-pressure hydraulic requirements.
By using protective atmospheres of pure hydrogen or cracked ammonia during induction heating, we resolve internal mechanical stresses without exposing the metal to oxygen. This preserves a bright metallic surface and limits chromium depletion at grain boundaries.
In high-pressure and highly corrosive environments, standard hot-finished products often suffer from surface irregularities and dimensional variances that can lead to localized stress and premature component failure. Our cold rolled and cold drawn processing is designed to refine the metallurgical grain structure, ensuring consistent wall thickness and exceptional dimensional accuracy.
During the rolling and drawing operations, work hardening increases the base mechanical tensile properties. To restore the alloy’s ductility and optimize corrosion resistance, the tubing undergoes an online bright annealing heat treatment. This step dissolves precipitated carbides back into the solid austenitic matrix, preventing intergranular corrosion paths in high-stress, offshore applications.
Offering specialized post-drawing fabrication to guarantee seamless integration with your target machinery and assembly workflows.
Precision bending and spiral forming services custom-configured to fit space-constrained boiler compartments, heat exchangers, and cooling coils.
High-precision laser and mechanical cutting to deliver exact cut-to-length tubing with minimal kerf and clean, deburred perpendicular faces.
Electropolishing and mechanical polishing to achieve low surface roughness (Ra) finishes, critical for sanitary bio-pharmaceutical applications.
End fabrication, including flaring, flanging, and swaging, designed to integrate seamlessly with industrial compression fittings and automotive exhaust systems.
Our stainless steel tubes and sheets are deployed across demanding environments that require mechanical reliability and corrosion resistance.
In today's global B2B procurement environment, reliability of supply is just as critical as raw material quality. At Liaocheng Sihe, we address this through our specialized China Factory 4.0 manufacturing approach. By integrating automated cold-drawing lines, online eddy current monitoring, and real-time process control, we maintain consistent production parameters across long manufacturing runs.
Our facility uses automated material tracking from raw steel coil reception through cold-rolling, bright annealing, final sizing, and testing. This end-to-end tracebility ensures that every raw heat number is permanently linked to the shipped product, providing complete documentation for compliance verification.
Furthermore, our strategically positioned factory in Shandong provides direct access to primary domestic steel mills, protecting our production schedule from raw material shortages. With a dedicated logistics network and deep-water port proximity, we maintain stable shipping timelines for our overseas distribution networks across the US, Germany, and Spain.
Ensuring structural reliability under extreme pressures through standardized mechanical testing and third-party verified quality audits.
Liaocheng Sihe operates with a commitment to zero-defect manufacturing. Each production run is subjected to a comprehensive testing matrix to verify both structural integrity and dimensional compliance. Our standardized quality control protocols include:
Every meter of our coiled and precision tubing undergoes online eddy current testing and air tightness testing to verify the absence of microscopic surface fissures, pinholes, or longitudinal weld flaws.
We execute standard drift, flaring, flattening, and reverse bending tests on sample coupons from each batch to confirm that cold work ductility meets the requirements for field fabrication.
Tensile testing and Rockwell/Vickers hardness checks are performed to ensure that the bright-annealing process has successfully relieved stress and met standard design specifications.
Understanding the balance of phase composition, pitting resistance, and stress corrosion cracking in extreme industrial applications.
To select the proper stainless steel grade for aggressive chemical processes, engineers must analyze the material's structural stability. For standard austenitic grades like 304/304L and 316/316L, corrosion resistance relies on a stable passivation layer of chromium oxide (Cr₂O₃). However, in the presence of warm chloride solutions, localized breakdown of this layer can lead to pitting or stress corrosion cracking (SCC).
For applications exposing components to high chloride levels or acidic environments, we utilize duplex alloys such as Duplex 2205 and Super Duplex 2507. These alloys feature a mixed microstructural phase of approximately 50% ferrite and 50% austenite, which provides higher yield strength and improved resistance to stress corrosion cracking compared to traditional austenitic steels.
To quantify pitting resistance, engineers utilize the Pitting Resistance Equivalent Number (PREN) formula:
Under this metric, standard 316L displays a PREN value of 23-25, Duplex 2205 ranges from 34-36, and Super Duplex 2507 reaches ≥ 40. This allows engineers to select the optimal material balance based on their specific operating temperatures and environmental conditions. Our technical team works directly with engineering clients to provide the necessary mechanical performance data and mill test certificates (MTC) required for project approval.
Addressing the next generation of clean energy infrastructures through material innovation and process decarbonization.
We are optimizing the interior bore surfaces of our TP316L and Inconel tubes to mitigate hydrogen embrittlement. This specialized conditioning ensures secure containment and transfer within clean hydrogen filling stations and high-pressure fuel cell infrastructures.
By transitioning our bright-annealing induction lines to renewable electrical power, we are working to reduce the carbon footprint of our operations, supporting our partners' supply chain sustainability targets.
We are scaling the production of Incoloy 825 and Inconel 625 coiled configurations to withstand the high-temperature brine exposures found in deep geothermal energy extraction systems.
Engineered shapes, capillary profiles, and custom coil lengths to match diverse mechanical configurations.
Engineered using Duplex 2205 for high pressure stability and corrosion resistance in subsea chemical injection systems.
Standard 1/2-inch outer diameter coiled configurations designed for hydraulic control systems and instrument hookups.
High-temperature resistant 310S grade stainless steel tubes built to withstand oxidizing atmospheres in furnace internals.
Key information regarding procurement guidelines, technical standards, lead times, and quality assurance frameworks.
Our prices are subject to change depending on supply, raw alloying material costs (nickel, molybdenum, chromium), and other market factors. We will send you an updated price list after your company contact us for further information.
Yes, we require all international orders to have an ongoing minimum order quantity. For specific custom grades (e.g., Duplex 2507 or Inconel 625), the MOQ is determined based on the setup of our drawing lines. If you are looking to resell but in much smaller quantities, we recommend you check out our website or contact our sales team to discuss trial configurations.
Yes, we can provide most documentation including Certificates of Analysis / Conformance; Material Test Reports (MTR) according to EN 10204 3.1; Marine Classification Certificates; Insurance; Certificate of Origin, and other export documents where required.
For samples or stock items, the lead time is about 7 days. For mass production of customized coiled tubes, the average lead time is 20-30 days after receiving the deposit payment. Lead times become effective when (1) we have received your deposit, and (2) we have your final technical drawing approval. In all cases we will try to accommodate your timeline, and in most instances we can adjust schedules for urgent project deadlines.
You can make the payment to our bank account, Western Union or PayPal: 30% deposit in advance, 70% balance against the copy of B/L.
We warranty our materials and workmanship. Our commitment is to your satisfaction with our products. In warranty or not, it is the culture of our company to address and resolve all customer issues to everyone’s satisfaction.
Yes, we always use high quality export packaging. Coiled tubes are shipped on metal or wooden reels wrapped in heavy polymer protection. We also use specialized hazard packing for dangerous goods and validated cold storage shippers for temperature sensitive items. Specialist packaging and non-standard packing requirements may incur an additional charge.
The shipping cost depends on the way you choose to get the goods. Express is normally the quickest but also most expensive way. By sea freight is the standard solution for bulk orders. Exact freight rates can only be calculated when we have details of the volume, weight, and delivery location. Please contact us for further information.
We utilize high-temperature bright annealing at temperatures between 1040°C and 1150°C in a protective atmosphere (cracked ammonia/pure hydrogen). This process rapidly dissolves carbides back into the grain structures, and the subsequent rapid cooling stage prevents chromium carbide precipitation at the grain boundary interfaces.
Explore our inventory of precision coiled and straight tubing configurations for industrial heat transmission and hydraulic systems.
