Sihe Steel
Sihe Steel
Explore our signature lines of high-durability stainless steel and alloy piping options tailored for heat exchange systems, hydraulic lines, and marine environments.
Liaocheng Sihe Stainless Steel Material LTD is a globally established manufacturer and supplier specializing in premium stainless steel coiled tubes, polishing tubes, and seamless coiled tubing configurations. By maintaining six state-of-the-art production lines, we ensure an uninterrupted supply chain that responds effectively to global engineering projects and bulk industrial distributions.
Our manufacturing facility enforces international alignment with major compliance frameworks, including GB, ASTM, ASME, JIS, and EN standards. Sihe's product lines cover an extensive array of standard and advanced alloys: 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800, alongside specialized offerings in Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
With more than 10 years of domestic and export manufacturing experience, our products have successfully penetrated over 30 countries and regions, including the United States, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe. Over 80% of our precision coil exports are directed globally to fulfill strategic oil, gas, and chemical project specifications.
Cold Rolled 316 Stainless Steel Sheet forms the foundational element for countless highly critical industrial parts. Renowned for its superior corrosion resistance compared to 304, the addition of Molybdenum (2-3%) in Grade 316 ensures elevated protection against pitting and crevice corrosion, specifically in chloride-rich environments, chemical processing systems, and marine atmospheres.
Our manufacturing process employs precise multi-stage cold reduction processes. By rolling steel below its recrystallization temperature, we alter its crystal grain structure. This strain hardening method yields sheets with impeccable surface finishes (including 2B, Bright Annealed, No. 4 Polished, and Hairline), highly uniform thicknesses, and increased yield and tensile strength. These sheets serve as crucial raw inputs for forming precision high-pressure tubing, process vessels, heat exchanger plates, and subsea structures.
Understanding the metallurgical composition is key to choosing the correct steel grade for harsh environments. Grade 316L (Low Carbon) is specifically utilized to mitigate sensitization—the precipitation of chromium carbides at grain boundaries during welding processes—which preserves corrosion resistance in welded structures.
| Steel Grade | Yield Strength (MPa Min) | Tensile Strength (MPa Min) | Elongation (% Min) | Hardness (HRB Max) | Pitting Resistance (PREN) |
|---|---|---|---|---|---|
| ASTM A240 Grade 316 | 205 | 515 | 40 | 95 | 23 - 25 |
| ASTM A240 Grade 316L | 170 | 485 | 40 | 95 | 23 - 25 |
| Duplex 2205 (S32205) | 450 | 620 | 25 | 293 (HB) | 34 - 36 |
| Super Duplex 2507 (S32750) | 550 | 750 | 15 | 310 (HB) | > 40 |
Procuring high-grade materials at scale requires deep visibility into manufacturing timelines, quality control protocols, and supply chain logistics. B2B buyers in sectors such as pharmaceutical biotechnology, desalination plants, subsea oil and gas, and chemical storage systems face strict compliance mandates that demand comprehensive material certification.
At Liaocheng Sihe, we address these demands by offering mill test certificates (MTC) aligning with EN 10204 3.1, detailing precise ladle analysis and destructive/non-destructive testing results. Through our direct manufacturing route, we eliminate third-party markups, giving our global clients pricing stability amidst volatile alloy surcharges for nickel and molybdenum.
Full heat number traceability back to raw billet melting. In-house spectrometers confirm the precise chemical composition of every batch.
High-precision cold rolling mills enforce tight thickness tolerances (+/-0.02mm) across custom lengths and widths.
Hydrostatic, eddy current, mechanical tensile, flaring, flanging, and 100% pneumatic testing for zero-leak tube configurations.
Liaocheng Sihe goes beyond basic material supply. We offer tailored post-processing and precision metalwork configurations to meet exact drawing specifications. Whether it is transforming sheets into structures or fabricating ultra-long seamless coiled tubes, our processing services ensure maximum material efficiency and compliance.
Comprehensive support for 304, 316L, 2205 grades with precise outer diameter specifications starting from 6.35mm up to 19mm for seamless coils.
Industrial bending, custom spiral forming, precision drawing, and coil configuration designs tailored for shell and tube heat exchangers.
Fiber laser cutting, high-accuracy mechanical shearing, and oxygen-barrier flame cutting to produce perfectly flat edges with zero heat-affected zone distortion.
Bright Annealing (BA), pickle-passivation processes, electropolishing, and mechanical hair-line brushing for decorative and highly clean fluid systems.
Heavy-duty cold flanging processing, engineered for seamless assembly in automotive exhaust paths, chemical pipelines, and precision instrumentation.
Due to the remarkable structural integrity, thermal stability, and corrosion protection properties of our cold-rolled sheets and custom-drawn coiled tubes, they are utilized in several high-risk and challenging fields:
High thermal efficiency design withstanding structural stress in extreme power and marine cooling applications.
Coiled paths that manage intense pressure shifts and resist ambient oxidation in HVAC condenser coils.
Engineered paths optimized to resist organic acids, hot sulfuric compounds, and industrial chemical solvents.
Strict sanitary standards requiring ultra-smooth finishes to prevent bacterial adherence and contamination.
High purity materials suitable for cleanroom environments, process pipes, and biological storage.
Reliable tubing solutions for steam condensers, gas processing pipes, and nuclear cooling cycles.
Ideal for subsea hydraulic lines, downhole control paths, and harsh offshore drilling rigs.
Lightweight, high-strength tubing paths matching rigid aerospace weight-to-performance criteria.
Quality assurance is the foundation of Liaocheng Sihe. Our facilities are certified to match international industrial norms, ensuring that every shipment complies with safety and performance protocols. We present our mill certifications and testing documentation openly to guarantee compliance for any public tender or commercial contract.
Our product line addresses diverse industrial layouts. By maintaining core raw materials, we process and supply the following major configurations:
Featuring seamless and flexible configurations. Duplex 2205 contains balanced austenitic and ferritic microstructures to support reliable gas delivery paths.
Precision drawing from 0.125 inch (3.175mm) to 1 inch (25.4mm) outer diameter, featuring thin wall options for instrumentation systems.
Pipes engineered to handle high temperatures and resist oxidation, including Grades 310S, 309S, and Incoloy alloys.
Our core Cold Rolled 316 and 304 series, providing flat, durable stock with uniform grain structures.
The stainless steel sector is transforming through carbon-reduction goals and smart manufacturing practices. Liaocheng Sihe is updating its process technology to include automated bright annealing ovens, real-time laser monitoring, and energy-efficient induction heating. These additions ensure consistent metallurgical grain sizing and lower energy consumption per ton produced.
Our research and development team concentrates on maximizing pitting resistance parameters in ultra-thin cold-rolled sheets. By optimizing the distribution of alloying elements during billet casting and cooling, we aim to extend the lifecycle of Grade 316 sheet variations. This helps reduce long-term maintenance costs and material replacement cycles in offshore oil extractions and subsea operations.
Review clear answers regarding pricing, minimum order quantities (MOQ), production lead times, and logistical guarantees below.
Browse our selection of specialized tubing products, covering various national standards, surface polishes, and alloy grades tailored for complex environments.
