Sihe Steel
Sihe Steel
The global demand for high-integrity piping systems is undergoes a structural shift driven by extreme operational environments in subsea exploration, high-purity microelectronics manufacturing, and decarbonization infrastructures. Today's commercial applications demand materials capable of surviving high-pressure cyclic loading, elevated temperatures, and aggressively corrosive chemical processes.
As a premier expert, Liaocheng Sihe Stainless Steel Material LTD integrates state-of-the-art metallurgical processing to meet these rigorous standards. Through advanced thermodynamic modeling and strict manufacturing controls, our mill yields stainless steel coiled tubes, capillary tubes, and heat exchanger pipes that satisfy standard designations worldwide, including GB, ASTM, ASME, JIS, and EN.
Strategically located in Liaocheng, China, our company represents over a decade of dedication to precision cold-drawn and bright-annealed stainless steel tube manufacturing.Operating six high-precision production lines and three specialized coil forming systems, we manufacture high-integrity tube solutions optimized for challenging global projects.
Our core competency lies in the manufacturing of extremely long continuous runs. Our coiled tubing is available in outer diameters (OD) spanning from 0.125 inches (3.175 mm) to 1.0 inch (25.4 mm), with wall thicknesses reaching up to 0.165 inches (3.0 mm). We deliver uninterrupted lengths up to 32,800 feet (10,000 meters)—a vital breakthrough that directly reduces joint vulnerabilities and lowers installation costs in subsea umbilical applications.
Our factory features inline bright annealing technologies under protective pure hydrogen atmospheres. This ensures zero oxidation, a perfectly clean scale-free inner diameter (ID), and superior metallurgical ductility.
Every single coil undergoes 100% pneumatic testing, air tightness checks, hydraulic pressure validation, eddy current inspections, dimensional tolerances control, tensile strength, hardness, flaring, and flattening tests.
From raw heat numbers of premium wire rods to finished tubes, our QC tracking system guarantees complete documentation (MTRs to EN 10204 3.1) supporting chemical compositions and mechanical limits.
We process custom austenitic, duplex, and nickel-base superalloys selected for high pitting resistance equivalent numbers (PREN) and mechanical robustness under extreme operating environments.
| Alloy Category | Standard Steel Grades | Primary Alloying Elements | Key Environmental Fit |
|---|---|---|---|
| Austenitic Stainless Steel | 304/304L, 316L, 321, 317L, 309S, 310S | Fe, Cr (~18-20%), Ni (~8-12%), Mo (~2-3% in 316L) | Standard industrial corrosion protection, food processing, medical capillary systems, HVAC. |
| Duplex Stainless Steel | Duplex 2205 (UNS S32205 / S31803) | Cr (~22%), Ni (~5%), Mo (~3%), N (~0.18%) | Excellent resistance to stress corrosion cracking (SCC) and pitting in high chloride applications. |
| Super Duplex Steel | Super Duplex 2507 (UNS S32750) | Cr (~25%), Ni (~7%), Mo (~4%), N (~0.27%) | Extreme deepwater marine environments, acid gas processing, desalination plant piping. |
| Nickel Superalloys | Incoloy 825, Inconel 625, Incoloy 800 | Ni (~38-60%), Cr (~20%), Mo, Cu, Fe | Sour gas wells, high-temperature heat exchangers, chemical reactors processing sulfuric/phosphoric acids. |
Supports raw material manipulation across 304, 316L, and Duplex 2205, for custom stainless steel coils with outer diameters spanning 6.35 mm up to 19 mm.
Specialized engineering for spiral heat exchanger coils, custom tight-radius bends, and specialized configurations for cooling units and process machinery.
Incorporates high-precision CNC laser cutting, mechanical chipless cutting, and straightening to supply accurate capillary tube lengths for critical medical instrument designs.
Provides bright annealing (BA) and options for mechanical polishing or electropolishing (EP) to attain low roughness profiles (Ra ≤ 0.25 μm) for ultra-clean industrial gases.
Engineered end flares and swaging optimized for pressure fittings, automotive exhaust systems, downhole control line instrumentation, and connection blocks.
2205 stainless steel is a duplex stainless steel containing austenitic and ferritic microstructure, delivering exceptional resistance to chloride stress cracking.
1/2" stainless steel coiled tubing refers to a continuous coil engineered to decrease mechanical connections and leakage risks across chemical systems.
High-chromium nickel grade designed for elevated temperature services, exhibiting excellent creep resistance and cyclic oxidation tolerance.
We adhere strictly to international manufacturing codes. Our products hold certifications confirming that chemical compositions, dimensional precision, and structural characteristics conform to ASTM A269, A312, EN 10216-5, and related aerospace standards.
