Sihe Steel
Sihe Steel
Explore our top-tier industrial coiled, welded, and seamless stainless steel piping solutions designed for harsh environments.
Stainless steel capillary pipe represents the pinnacle of micro-dimensional engineering in modern metallurgy. Characterized by extremely tight dimensional tolerances, microbore inner diameters, and high surface integrity, these tubes are indispensable in high-demand flow control systems, medical diagnostics, chromatography, and aerospace instrumentation.
Liaocheng Sihe Stainless Steel Material LTD specializes in manufacturing high-precision seamless capillary tubes, using advanced Bright Annealing (BA) Technology and multi-pass cold drawing techniques. Our structural capacity ensures that every meter of capillary tubing demonstrates uniform mechanical attributes, optimal corrosion resistance, and flawless internal surface finish, matching international requirements.
As micro-fluidic applications become more complex, selecting the appropriate material grades (such as AISI 304, AISI 316L, or specialty alloys like Incoloy 825) is crucial. Our manufacturing process ensures minimal eccentric variation, enabling smooth and highly predictable flow rates even under high pressure limits.
Leveraging ten years of experience, three specialized coil lines, and six primary fabrication channels.
Our capillary pipes are offered in an extensive range of configurations, with custom dimensions prepared to order. Standard size classifications cover outer diameters from 0.125 inches (3.175 millimeters) to 1.0 inch (25.4 millimeters). The wall thickness profiles stretch up to 0.165 inches (3.0 millimeters), offering reliable structural strength under elevated pneumatic or hydraulic load parameters.
Our specialty is the fabrication of super-long continuous coiled piping systems, with continuous single-run configurations scaling up to 10,000 meters. This minimizes the necessity for orbital joints and connectors, reducing leak risks in complex installations like subsea control lines or downhole chemical injection systems.
| Alloy Class | UNS / DIN Code | Key Performance Traits | Primary Industrial Use Cases |
|---|---|---|---|
| Austenitic 304/304L | UNS S30403 / 1.4307 | Excellent ductility, standard mechanical properties, cost-effective corrosion resistance. | Instrumentation systems, general hydraulic loops, consumer appliances. |
| Austenitic 316L | UNS S31603 / 1.4404 | High molybdenum fraction, superior pitting resistance in saline / mild acid fluids. | Chemical processing pipelines, pharmaceutical production, marine sensors. |
| Duplex 2205 | UNS S31803 / 1.4462 | Dual-phase micro-structure offering high yield limit and superior stress corrosion cracking protection. | Offshore oil and gas pipelines, high-temperature heat transfer equipment. |
| Super Duplex 2507 | UNS S32750 / 1.4410 | Highly alloyed, designed for demanding high-chloride oilfield applications. | Deepwater subsea umbilicals, high-salinity seawater intake systems. |
| Incoloy 825 | UNS N08825 / 2.4858 | High nickel/iron/chromium content providing resistance to both reducing and oxidizing acids. | Sour gas well downhole tubing, chemical processing equipment. |
| Inconel 625 | UNS N06625 / 2.4856 | Superior creep strength, exceptional resistance to oxidation and pitting under extreme heat. | Aerospace propulsion systems, waste incinerator thermal wells. |
How Liaocheng Sihe integrates local resources, specialized processes, and strict quality control to deliver competitive pricing.
Direct partnerships with key domestic raw material suppliers ensure stable supply and predictable pricing for nickel-rich and molybdenum alloys.
Our bright annealing systems process tubing in a hydrogen-rich atmosphere, maintaining a bright surface and preventing scale formation without acid pickling.
Includes 100% hydrostatic and eddy current inspection, pneumatic tests for micro-leak detection, and mechanical tests (flaring, bending, tensile) to guarantee high reliability.
Our products adhere strictly to GB, ASTM, ASME, JIS, and EN standards. Click on the certificates below to verify our credentials.
Our diverse range of stainless steel products is engineered for critical application requirements.
Tailoring precision stainless steel capillary and coiled piping components to exact engineering requirements.
Supports various materials (e.g., 304, 316L, 2205) and specifications (diameter 6.35mm to 19mm) for stainless steel coils.
Includes bending, spiral forming, precision drawing, and other processes tailored for heat exchangers.
Laser cutting, mechanical cutting, or flame cutting for high-precision and efficient material processing.
We develop new products with state-of-the-art electropolishing and bright annealing technologies.
End connections in high-pressure capillary pipes require precise flanging. Our processing lines offer specialized cold flanging on capillary tubes ranging from 1/8 inch up to 1 inch outer diameters.
These processed ends are commonly used in automotive exhaust systems, chemical pipelines, and precision instrument connections, providing robust leak protection and ensuring reliable service lifetimes under high pressure.
Our tubing solutions are engineered to perform in demanding industrial conditions.
Exporting high-precision tubing requires meticulous packaging to protect structural integrity during transit. For international shipments, Liaocheng Sihe utilizes reinforced wooden spools, custom plastic casing, and desiccant packaging to prevent mechanical damage and moisture exposure.
Each delivery includes a complete documentation package containing Mill Test Certificates (MTC to EN 10204 3.1), dimensional measurement records, chemical composition analyses, and optional third-party testing validations (such as SGS or TUV). This ensures full compliance with international engineering specifications upon arrival.
Our logistical network supports shipping terms including FOB, CIF, DDP, and DAP, with efficient sea and air transport routes connecting our facility to major global ports.
Common questions regarding orders, technical specifications, and logistics.
Our prices are subject to change depending on material raw costs and market conditions. Please contact us with your specifications, and we will provide an updated pricelist.
Yes, we require minimum order quantities for international shipments. For specific custom sizes, please contact our team to discuss your production run requirements.
Yes, we provide Mill Test Certificates (MTC 3.1), Certificates of Conformance, export paperwork, and custom compliance documents as requested.
Samples typically take 7 days. Mass production lead times range from 20 to 30 days after receiving deposit and technical drawings approval.
We accept T/T bank transfers, Western Union, and PayPal. Our standard terms are a 30% deposit in advance, with the 70% balance due against the B/L copy.
We warrant material composition and workmanship. Our technical team works to resolve any quality questions to our customers' satisfaction.
Yes, we use high-quality packaging for export shipping, with optional custom crating for micro-diameter capillary tubing coils.
Shipping costs depend on weight, volume, and destination. Sea freight is recommended for volume orders, while express options are available for sample deliveries.
Review our extensive range of welded, seamless, and polished precision piping options.
