Sihe Steel
Sihe Steel
Explore our industrial-grade stainless steel pipes and coiled tube configurations tailored for extreme operating environments.
Industrial Leader in High-Performance Coiled Tubing and Polished Stainless Piping Solutions
Established as an elite authority in metallurgical engineering, Liaocheng Sihe Stainless Steel Material LTD operates six state-of-the-art production lines designed to manufacture superior-grade stainless steel coiled tubes, precision capillary tubing, and heat exchanger pipes. We strictly align our operations with recognized global standards: GB, ASTM, ASME, JIS, and EN.
Our comprehensive steel catalog features high-performance materials such as 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800, alongside specialized grades like Austenitic Steel 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625. We serve mission-critical sectors including military infrastructure, semiconductor manufacturing, biopharmaceuticals, aerospace, marine engineering, and oil exploration.
An in-depth look at alloy chemistry, grain structure optimization, and mechanical property dynamics.
SS304 (UNS S30400) relies on a minimum of 18% chromium and 8% nickel. This chemical combination creates a stable austenitic phase that remains non-magnetic and highly ductile across a broad temperature range. By managing carbon levels, we prevent the formation of grain-boundary chromium carbides, which can lead to intergranular corrosion under high temperatures.
Our manufacturing process includes a controlled acid bath that triggers the formation of a passive chromium oxide (Cr₂O₃) layer. This transparent, self-repairing layer resists chloride-induced pitting, general atmospheric corrosion, and organic compound damage. This makes our SS304 piping ideal for food preparation and medical industries.
Using precision cold-drawing and sizing processes, we refine the grain structure of our stainless steel tubing. This achieves tight dimensional tolerances, smooth interior surface finishes (with low Ra values to limit bio-burden accumulation), and improved yield strength under high pressure.
| Steel Grade | C (%) Max | Cr (%) | Ni (%) | Mo (%) | Yield Strength (MPa) Min | Tensile Strength (MPa) Min |
|---|---|---|---|---|---|---|
| AISI 304 (UNS S30400) | 0.08 | 18.0 - 20.0 | 8.0 - 10.5 | - | 205 | 515 |
| AISI 304L (UNS S30403) | 0.03 | 18.0 - 20.0 | 8.0 - 12.0 | - | 170 | 485 |
| AISI 316L (UNS S31603) | 0.03 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | 170 | 485 |
| Duplex 2205 (UNS S32205) | 0.03 | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 450 | 620 |
Online Bright Annealing Treatment for Superior Microstructure Control
Liaocheng Sihe Stainless Steel Material LTD has spent a decade refining its production technology. By using hydrogen-filled, oxygen-free online bright annealing technology, we can continuously soften stainless steel tubing online. This eliminates internal residual stresses from cold drawing without tarnishing the reflective surface of the metal.
This process reduces the need for secondary mechanical polishing while maintaining grain boundaries, preventing sensitization, and ensuring consistent mechanical properties over long tubing runs. For complex subsea umbilical lines, this process ensures reliable performance across continuous tube lengths up to 32,800 feet (10,000 meters).
How our stainless steel tube systems support demanding operations worldwide.
Deep offshore environments require tubing that can withstand high pressures and corrosive sea water. Our high-pressure coiled tubing, manufactured from Duplex 2205 and Incoloy 825, ensures safe chemical injection and hydraulic control transfer from surface platforms down to subsea wells.
In bio-processing, clean surfaces are essential. Our bright-annealed SS304 and 316L capillary lines feature extremely low internal roughness. This prevents bacterial growth and chemical contamination during critical fluid transfer stages.
Power plants and solar thermal setups rely on efficient heat transfer. Our thin-wall, high-conductivity heat exchanger tubing is designed to resist thermal cycling and stress corrosion cracking under continuous operation.
With precise diameter configurations ranging from 0.125 inches (3.175 mm) up to 1 inch (25.4 mm), our high-pressure hydraulic lines provide reliable, leak-free performance under extreme vibration and pressure fluctuations.
The transport of high-purity process gases requires clean, smooth tubing. Our high-precision capillary and polished stainless steel tubing prevent particle generation, helping safeguard semiconductor manufacturing yields.
Every shipment is backed by strict metallurgical testing, international certifications, and trace documentation.
To ensure high quality, we test all of our products. Our facility performs both destructive and non-destructive quality tests:
We provide advanced fabrication options to deliver ready-to-install components for your system.
We manufacture custom coils, spiral forms, and serpentine layouts. These are designed to fit the specific space limits of advanced heat exchangers and condenser systems.
We use precision laser cutting and mechanical cutting systems to deliver exact, clean cut-to-length tubes with square, burr-free ends.
We offer electro-polishing, chemical passivation, and specialized cleaning services. These help meet the strict sanitization and purity standards of semiconductor and pharmaceutical lines.
Our flanging and end-forming services provide secure connections. These are ideal for automotive exhausts, high-pressure instruments, and chemical pipelines.
Our stainless steel tubes are installed across a wide range of industrial applications, including:
Heat Exchangers
HVAC Systems
Chemical Processing
Food & Beverage
Important details about pricing, custom specifications, global logistics, and material certifications.
Browse our catalog of custom processing shapes, special alloys, and high-performance piping structures.
2205 duplex and austenitic seamless coils designed for high fatigue resistance.
1/2" diameter and custom sizes for structural piping networks.
High-temperature resistant alloy coils for boilers and furnaces.
Access our secondary product categories, specialized alloy sheets, and micro-capillary tubes.
