Sihe Steel
Sihe Steel
Explore our top industrial grade stainless steel coiled tubing, polishing pipes, and capillary solutions optimized for various commercial and mechanical applications.
Grade 304 (UNS S30400) is the standard "18/8" stainless steel, belonging to the austenitic family. Its distinct chromium-nickel alloy composition delivers superior oxidation resistance and mechanical strength under harsh industrial working conditions.
At Liaocheng Sihe Stainless Steel Material LTD, we control the chemical balance of Grade 304 with extreme precision. The high nickel concentration (8.0% - 10.5%) stabilizes the austenitic structure, ensuring exceptional ductility, non-magnetic properties, and superior formability. Meanwhile, the chromium content (18.0% - 20.0%) builds a continuous, self-healing passive oxide film that stops deep pitting and general corrosion.
| Steel Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Ni (%) | N (%) |
|---|---|---|---|---|---|---|---|---|
| TP304 | ≤ 0.08 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 | 18.0 - 20.0 | 8.0 - 11.0 | - |
| TP304L | ≤ 0.035 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 | 18.0 - 20.0 | 9.0 - 13.0 | - |
| TP316L | ≤ 0.035 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 | 16.0 - 18.0 | 10.0 - 14.0 | Mo: 2.0-3.0 |
Our production facilities house six high-performance drawing lines configured to manufacture ultra-long, seamless coiled tubing. One of our core competitive advantages is the integration of **Online Bright Annealing (BA)** technology.
This process heats the stainless steel tubing under a dry hydrogen and nitrogen atmosphere to recrystallize the metal grain structure. Keeping the chamber oxygen-free prevents oxide scale from forming, resulting in a smooth, high-purity, reflective finish. Bright annealing also eliminates residual stresses from cold drawing, improving the pipe’s flexibility and corrosion resistance for high-vibration applications.
All products must pass strict physical inspection standards before dispatch:
Supporting heavy industries across international territories with high-durability, corrosion-resistant tube solutions.
Supplying ultra-long, jointless coiled tubes up to 10,000 meters. Perfect for control lines and chemical injection systems in high-pressure, subsea oil and gas extraction fields.
Our 304 and 316L coiled tubes deliver high thermal conductivity and mechanical strength, optimizing heat exchange loops in commercial refrigeration setups.
Precision capillary tubes feature ultra-clean, polished inner surfaces (ID) to prevent particle buildup and microbial contamination in ultra-pure fluid handling networks.
We tailor physical profiles, dimensional tolerances, and structural parameters to align with complex engineering designs.
Configured with specific helical diameters and pitches to fit compact spatial footprints in heat recovery units and process vessel jackets.
Provides secure, leak-free mechanical joints under high pressures, making it ideal for automotive exhaust runs and heavy-duty chemical piping.
Delivers exceptionally clean, burr-free cuts with tight dimensional tolerances, removing the need for secondary end-finishing before assembly.
Provides mechanical and electrochemical polishing to control inner and outer wall roughness, satisfying sanitary engineering standards.
For more than ten years, Liaocheng Sihe Stainless Steel Material LTD has served as a reliable global manufacturer of high-performance stainless steel coiled tubes, capillary tubes, and industrial piping.
Equipped with modern manufacturing setups, advanced metallurgy technology, and skilled technicians, we manufacture items in strict alignment with GB, ASTM, ASME, JIS, and EN standards. Our product catalog features high-grade metals including 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
We export 80% of our production capacity to over 30 countries and regions, including the United States, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe, satisfying global quality standards.
Our high-precision tubing is engineered to perform across diverse industrial environments globally.
Coiled configurations for dynamic heat transfer with low thermal stress deformation.
Copper-replacement options delivering high pressure safety and long lifetimes.
Exceptional resistance to acidic/alkaline media and high operational reliability.
High-purity sanitary grades that preserve system hygiene and prevent flavor contamination.
Electropolished interiors designed for sterile transport systems and pure water loops.
High-temperature alloys built for superheaters and steam return pipelines.
Handles volatile hydrocarbons and sulfurous gas mixtures reliably over long runs.
Provides high fatigue resistance for fuel injection rails, braking lines, and hydraulic networks.
As deep-water oil extraction and petrochemical processing push to greater depths and temperatures, standard steel grades face technical limits. Our R&D division focuses on exploring the next generation of corrosion-resistant alloys (CRAs).
Our future roadmap targets higher yield strengths and enhanced pitting resistance equivalent numbers (PREN). We are optimizing high-alloy materials, including Duplex 2205, Super Duplex 2507, and nickel-based superalloys (Inconel 625, Incoloy 825). These alloys provide excellent resistance to chloride-induced stress corrosion cracking and hydrogen embrittlement.
Additionally, we are developing automated grain structure inspection methods and cleaner bright annealing gases (using high-purity argon loops) to reduce trace impurities on tube walls, preparing for the demands of the sub-10nm semiconductor sector.
Find answers to technical specifications, commercial terms, and production processes.
Review our extensive range of high-performance alloy structures and specialty items manufactured for extreme environments.
2205 duplex stainless steel coiled tube offering high yield strength.
1/2 inch O.D. coiled tube, manufactured for chemical injection runs.
Designed for high-temperature furnace tubes and combustion chambers.
Corrosion-resistant tube solutions optimized for high-pressure applications.
Precision-straightened exchanger tubes ready for immediate assembly.
Highly reflective, smooth-bore pipelines for sanitary fluids.
Coiled tubing configured for deepwater marine environments.
Tight dimensional control for laboratory instruments and medical sensors.
High-strength plates built for structural tanks and reactor vessels.
Engineered for maximum thermal cycle efficiency and surface exposure.
Made from Inconel/Incoloy alloys for aggressive chemical media.
Bright-annealed hydraulic lines that prevent contamination and system wear.
Thick-walled seamless tubes designed for high-stress civil infrastructure, marine offshore platforms, and industrial petrochemical plants.
Direct factory supply of wholesale stainless steel sheets, thin-wall capillary tubing, and coiled processing products.
