Sihe Steel
Sihe Steel
Explore our high-performance precision tubing, heat exchanger pipes, and custom surface-protected steel solutions manufactured according to ASTM, ASME, JIS, and EN standards.
In modern industrial procurement, surface integrity is non-negotiable. When sourcing wholesale stainless steel sheets, surface damage during deep drawing, stamping, or transit can lead to astronomical scrap rates. PVC protective film coating (ranging from 50 to 100 microns, including UV-resistant and fiber laser cutting grade films) provides a physical barrier against abrasion, mechanical scuffs, and chemical exposure during hydraulic pressing.
Alternatively, paper interleaving using non-corrosive neutral paper prevents metal-to-metal contact, preventing micro-fretting corrosion and moisture entrapment between stacked sheets. For high-precision architectural panels, mirror-polished 316L, and pharmaceutical-grade surfaces, combining precision PVC laminating with automated paper interleaving represents the pinnacle of surface quality assurance.
As offshore oil and gas extraction migrates toward ultra-deepwater environments exceeding 3,000 meters, traditional jointed piping introduces unacceptable failure vectors. Continuous seamless coiled tubing—manufactured in spools up to 32,800 feet (10,000 meters)—eliminates intermediate mechanical fittings and orbital welds.
Utilizing high-alloy materials like Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625, these long-length umbilical coils withstand aggressive sour gas (H2S), high concentrations of chlorides, and extreme subsea hydrostatic pressures. Bright annealing technology ensures clean internal diameters (ID) with minimal roughness, crucial for hydraulic control lines and chemical injection systems.
Our state-of-the-art facility operates six dedicated production lines adhering strictly to international standards including GB, ASTM, ASME, JIS, and EN.
| Steel Grade Family | Specific Alloy Grade | Applicable Standards | Outer Diameter (OD) Scope | Wall Thickness (WT) | Primary Industrial Application |
|---|---|---|---|---|---|
| Austenitic Stainless | 304 / 304L | ASTM A269, ASTM A249, JIS G3463 | 0.125" to 1" (3.175 - 25.4 mm) | Up to 0.165" (3.0 mm) | General hydraulic, automotive exhaust, food & beverage processing. |
| Acid-Resistant Austenitic | 316L / 317L | ASTM A269, EN 10216-5, DIN 439 | 0.125" to 1" (3.175 - 25.4 mm) | Up to 0.165" (3.0 mm) | Pharmaceutical biotechnology, semiconductor ultra-pure fluid lines. |
| High-Temperature Austenitic | 321 / 309S / 310S (1.4841) | ASTM A312, ASTM A269, EN 10095 | Custom Mill Specs | Up to 0.165" (3.0 mm) | Boilers, heat exchangers, furnace components, aerospace ducting. |
| Duplex Stainless Steel | Duplex 2205 (UNS S31803) | ASTM A789, ASTM A790 | 9.52mm - 25.4mm | 1.24mm - 3.0mm | Desalination plants, chemical processing, marine heat exchangers. |
| Super Duplex Steel | Super Duplex 2507 (S32750) | ASTM A789, ASTM A790 | Custom Coil Sizes | Engineered to Spec | Subsea umbilicals, high-chloride offshore oil exploration. |
| Nickel Alloy Superalloys | Incoloy 800 / 825, Inconel 625 | ASTM B423, ASTM B704, ASME SB423 | 0.125" to 1" (3.175 - 25.4 mm) | Precision Drawn | Nuclear power, severe chemical processing, downhole umbilical lines. |
With over a decade of dedicated metallurgical innovation, Liaocheng Sihe Stainless Steel Material LTD stands as a premier global manufacturer of seamless coiled tubing, bright annealed precision pipes, and surface-protected stainless steel sheets.
Our facility houses six state-of-the-art production lines equipped with world-class online bright annealing technology. This advanced thermal processing occurs under a controlled protective gas atmosphere, delivering fully softened, scale-free stainless steel tubing with exceptional ductility and mirror-like surface brightness.
Export Leadership: Currently, over 80% of our precision coil production is exported worldwide, serving critical sectors in over 30 countries across North America, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
From raw alloy selection to final packaging, our engineering teams provide specialized processing tailored to your precise industrial requirements.
Supports extensive grade selections (304, 316L, 2205, 2507, Inconel 625) and precise dimensional customization with outer diameters from 6.35mm to 19mm and wall thicknesses up to 3mm.
Specialized precision bending, spiral coil forming, precision re-drawing, and continuous orbital welding designed for heat exchangers and subsea control umbilicals.
High-precision laser cutting, mechanical burr-free cutting, and dynamic tube straightening ensuring zero micro-cracking and tight length tolerances for instrument lines.
Online application of specialized PE/PVC laser protective films, deep-drawing films, and acid-neutral paper interleaving for stainless steel sheet mirror finishes.
Precision tube flanging, expanding, and reduction testing. Critical for automotive exhaust assemblies, high-pressure chemical joints, and aerospace couplings.
Our coiled tubing and sheet materials are field-proven in extreme operational environments globally.
To maintain total reliability, every coil and pipe undergoes comprehensive nondestructive testing (NDT), hydrostatic pressure testing, dimensional calibration, and mechanical stress evaluation.
Advancing EP (Electropolished) and BA (Bright Annealed) tubing capabilities to meet 10 Ra max internal surface roughness requirements for ultra-high purity gas distribution lines in semiconductor fabrication plants.
Integrating continuous hydrogen-atmosphere annealing furnaces that eliminate carbon emissions while achieving zero surface oxidation, reducing energy consumption per metric ton by 28%.
Implementing real-time laser wall thickness gauging and automated ultrasonic fault detection during the continuous cold-drawing process to guarantee zero wall concentricity variance.
Clear answers to global enterprise procurement, technical specifications, and shipping compliance queries.
Select from our extended portfolio of Super Duplex, DIN standard, and high-temperature alloy continuous coil pipes.
