Sihe Steel
Sihe Steel
Explore our top-tier precision-drawn, bright-annealed, and coiled piping configurations engineered for high-pressure, cryogenic, and corrosive environments.
As a global manufacturing authority based in China, Liaocheng Sihe Stainless Steel Material LTD operates six world-class extrusion and drawing lines, focusing exclusively on high-performance stainless steel coiled tubing, seamless heat exchanger pipes, capillary pipes, and polished tubes. Our metallurgical expertise encompasses high-purity austenitic profiles (304/304L, 316L, 321, 317L, 309S, 310S) and advanced high-nickel and duplex superstructures (Incoloy 800, Incoloy 825, Inconel 625, Duplex 2205, and Super Duplex 2507).
By strictly adhering to global design standards including GB, ASTM, ASME, JIS, and EN, we serve critical projects across 30 countries and regions. Our engineering prowess resides in our capability to deliver continuous ultra-long coiled pipelines up to 32,800 feet (10,000 meters) without a single orbital weld. This eliminates micro-leak paths and provides mechanical integrity in high-risk deepwater subsea control umbilicals, chemical injection systems, and aerospace fluid dynamics.
Our infrastructure supports the global energy transition, semiconductor scale-up, and chemical processing upgrades. We deploy advanced bright annealing lines to relieve material stresses online, ensuring stable mechanical performance in harsh corrosive environments.
As offshore exploration moves deeper into harsher ocean basins, the pressure levels and chloride concentrations surge. Sihe Steel develops corrosion-resistant, continuous coiled tubing for hydraulic control systems, subsea chemical injection lines, and subsea distribution units (SDUs).
By utilizing high-alloy materials such as Super Duplex 2507, Incoloy 825, and Inconel 625, we deliver components designed for severe pitting index (PREn > 40) environments, preventing stress-corrosion cracking (SCC) and localized mechanical fatigue.
Our processing capabilities match the requirements of high-purity micro-electronics fabrication, sterile bio-pharmaceutical processes, and nuclear cooling cycles. Below are our core technical areas:
Supports various materials (e.g., 304, 316L, 2205) and specifications (outer diameter 6.35mm to 25.4mm) for seamless and welded stainless steel coils.
Precision CNC tube bending, spiral forming, localized cold drawing, and customized continuous configuration designed for compact high-efficiency heat exchangers.
High-speed CNC laser cutting, clean mechanical cold cutting, and flame profiling with tolerances controlled within ±0.1mm to eliminate heat-affected zone (HAZ) damage.
Specialized Bright Annealing (BA), mechanical inner and outer surface polishing, and high-purity chemical passivation to minimize roughness down to Ra < 0.25 μm.
Standard and customized flange integration, flare forming, and high-integrity end-finishing used in automotive exhaust networks and aggressive chemical connections.
Comprehensive non-destructive testing (NDT), hydrostatic, pneumatic, hardness 100%, elongation, flattening, flaring, and intergranular corrosion tests per ASTM A262.
Our stainless steel 304 and high-alloy tubing systems are designed for high-stress applications in modern chemical, energy, and precision instrument fields:
Our product classifications represent optimized engineering structures for high durability and performance.
Flexible seamless coils in grades like 2205 duplex, 304, and 316L. Excellent structural integrity and continuous layout, minimizing potential leak points in high-pressure networks.
Designed for precision instruments, HPLC analysis, and control lines. Tight dimensional tolerances, clean interior bores, and high resistance to stress corrosion.
ASTM A213/A269 compliant tubing engineered for boilers, condensers, and thermal transfer modules. Optmized heat dissipation performance under elevated thermal ranges.
Mirror finish tubing for architectural, design, and high-purity industrial distribution networks.
Highly flexible, cold-drawn seamless tubing configurations for pneumatic control circuits.
Custom drawing profiles for subsea deployment without mid-span weld seams.
Purchasing departments for large projects require supply chain predictability, material consistency, and cost optimization. Sihe Steel mitigates market volatility through centralized raw material inventory management and efficient production schedules, reducing lead times to 20–30 days for volume orders.
Deploying stainless steel 304/304L or 316L in critical applications requires compliance with standard codes such as ASME BPVC Section II and the European Pressure Equipment Directive (PED 2014/68/EU). Our processes include complete chemical trace heat numbers, physical testing, and EN 10204 3.1 certification.
The transition toward hydrogen energy and green chemical synthesis demands components with low hydrogen permeation rates and minimized internal surfaces. We are researching grain boundary engineering and ultra-smooth inner surface processes (EP/BA) to support future industrial networks.
Selecting the correct material grade involves balancing chemical resistance requirements against mechanical load constraints.
| Alloy Grade | UNS Designation | Nominal Composition | Primary Mechanical Advantages | Typical Operational Environments |
|---|---|---|---|---|
| 304 / 304L | S30400 / S30403 | 18% Cr, 8% Ni | High ductility, cost-effective, good general corrosion resistance. | Food processing, beverage piping, low-pressure gas, structural elements. |
| 316 / 316L | S31600 / S31603 | 16% Cr, 10% Ni, 2% Mo | Enhanced resistance to chloride pitting, reduced weld-zone sensitization. | Marine hardware, chemical process equipment, pharmaceutical distribution. |
| Duplex 2205 | S31803 / S32205 | 22% Cr, 5% Ni, 3% Mo, 0.18% N | Double the yield strength of austenitics; high stress-corrosion cracking resistance. | Offshore oil wells, chemical tankers, high-chloride heat transfer units. |
| Inconel 625 | N06625 | Nickel-base, 21% Cr, 9% Mo, 3.6% Nb | Excellent mechanical properties at temperatures from cryogenic up to 1800°F (982°C). | Aerospace manifolds, engine components, sour gas processing, subsea umbilicals. |
Our manufacturing operations utilize rigorous testing procedures to verify the quality and consistency of every production batch:
Technical, commercial, and operational information for global procurement officers and design engineers:
Select from our full line of corrosion-resistant, high-temperature stainless steel tubing solutions, manufactured to international specifications.
