Sihe Steel
Sihe Steel
Engineered for high-pressure durability, corrosion resistance, and seamless system integration.
In modern industrial hydraulic systems, fluid control lines act as the nervous system. The choice of tubing material, processing standards, and testing procedures directly correlates with operational safety and environmental durability. Modern hydraulic applications, specifically in marine, aerospace, and high-pressure chemical processes, demand strict compliance with international mechanical properties.
Choosing the correct grade guarantees reliable corrosion inhibition. While standard austenitic 304 is highly suitable for general machine parts and internal hydraulic circuits, demanding offshore and petrochemical projects require the enhanced pitting resistance of 316L. For ultra-corrosive environments, Duplex 2205 and Super Duplex 2507 provide superior yield strength and resistance to stress corrosion cracking (SCC).
One of our structural technological competitive advantages is the integration of online bright annealing. By carrying out thermal treatment inside a controlled protective atmosphere (hydrogen/nitrogen), we prevent surface oxidation and preserve a perfectly reflective, smooth inner and outer diameter. This significantly reduces hydraulic flow friction and eliminates contamination risks in ultra-clean semiconductor gas lines.
Exploring how Liaocheng Sihe's specialized stainless steel tubing fulfills critical performance parameters across global industrial sectors.
Offshore exploration runs in ultra-deep waters where external ocean pressures and corrosive chloride environments limit normal steels. Our seamless coiled tubing, supplied in continuous lengths up to 32,800 feet (10,000 meters), reduces the need for orbital welds, limiting localized pitting risks and leakage pathways in downhole chemical injection lines and subsea control systems.
High-vibration engine bay compartments demand hydraulic tubes with exceptional fatigue strength. Our precision drawn, bright annealed 304 and JIS SUS201 welded tubing for exhaust pipes and high-pressure fuel injection rails absorb heavy mechanical shock and thermally cycle reliably without micro-cracking.
Thermal processing systems require materials with consistent dimensional tolerances and high heat-transfer coefficients. Our stainless steel heat exchanger pipes, produced in grade 310S, 309S, 321, and Duplex alloys, ensure optimal thermal performance and structural scaling resistance under intense temperature gradients.
Hover over the application segments to examine our global project integration paths.
Leveraging the structural scale of Liaocheng Sihe Stainless Steel Material Ltd. to secure premium metallurgy, shorter lead times, and global distribution.
Operating three state-of-the-art coiled tubing lines alongside six general piping fabrication installations, we offer deep capacity flexibility. Our factory specializes in delivering continuous lengths up to 32,800 feet, which significantly lowers connection failure rates in hydraulic control applications.
Browse our core inventory structure, supporting high-temperature and highly corrosive industrial environments.
Seamless design using Austenitic and Duplex 2205 alloys, optimized for instrumentation and chemical dosing lines.
High-precision, small-diameter piping (6.35mm down to capillary dimensions) for chromatography and analytical instruments.
Designed for demanding boiler environments and process engineering heat exchangers. High heat transference and low scaling.
Sihe provides customized mechanical adjustments so our hydraulic pipes fit straight into your assembly chain.
We execute precise bend radiuses and helical profiles down to small dimensions, ready for immediate assembly in refrigeration coils, analytical equipment, and heat exchanges.
Utilizing high-speed fiber lasers alongside dynamic straightening machines, we ensure perfect perpendicular cuts and tight linear dimensional specs for hydraulic control lines.
We perform precise end flanging (up to 26 different formats) and swaging on specialized hydraulic couplings, saving assembly time during site commissioning.
Our raw materials, heat-treat procedures, and pressure validations conform to the strictest global regulatory framework.
A reference mapping of our most popular austenitic and duplex steel alloys, sizing boundaries, and dimensional tolerances.
| Alloy Grade | UNS Designation | Outer Diameter Range | Wall Thickness Range | Standards Compliance | Key Applications |
|---|---|---|---|---|---|
| 304 / 304L | UNS S30400 / S30403 | 0.125" - 1.000" (3.175 - 25.4mm) | Up to 0.165" (3.0mm) | ASTM A269, A213, EN 10216-5 | General hydraulics, instrumentation, food process lines |
| 316 / 316L | UNS S31600 / S31603 | 0.125" - 1.000" (3.175 - 25.4mm) | Up to 0.165" (3.0mm) | ASTM A269, A213, JIS G3459 | Chemical dosing, subsea sensor paths, medical gas lines |
| Duplex 2205 | UNS S31803 / S32205 | 0.250" - 1.000" (6.35 - 25.4mm) | Up to 0.120" (3.0mm) | ASTM A789, EN 10216-5 | High-pressure offshore umbilicals, deep ocean oil injection |
| Incoloy 825 | UNS N08825 | 0.125" - 0.750" (3.175 - 19.05mm) | Up to 0.095" (2.41mm) | ASTM B163, ASTM B423 | Sour gas wells, downhole control valves, heat exchangers |
| Inconel 625 | UNS N06625 | 0.125" - 0.750" (3.175 - 19.05mm) | Up to 0.095" (2.41mm) | ASTM B163, ASTM B444 | Extreme subsea thermal joints, high temperature aerospace |
Essential guidance on lead times, ordering minimums, logistics coordination, and material validation records.
Our prices are calculated dynamically based on raw material costs (LME nickel and chromium rates), processing specifications, and production run sizing. Contact our sales department to receive an updated pricelist customized for your requirements.
Yes, we require all international orders to have an ongoing minimum order quantity. This ensures optimization of ocean freight and manufacturing setups. If you are looking to resell in smaller quantities, please contact our export specialists to discuss pilot runs.
We supply a complete quality documentation package with every shipment. This includes EN 10204 3.1 Material Test Certificates (MTC), Certificates of Conformity, origin certificates (Form E/CO), hydrostatic test logs, and third-party inspection releases where requested.
For pre-production samples, standard processing takes approximately 7 days. For mass production runs, typical lead times are 20 to 30 days from formal deposit confirmation and technical approval. We configure lines dynamically to match critical project milestones.
Our default international payment terms are 30% deposit in advance via Bank Telegraphic Transfer (T/T), with the remaining 70% balance settled against presentation of the Bill of Lading (B/L) copy. We also accept Western Union and PayPal for sample routing.
We use heavy-duty wooden drums or metal reels wrapped in protective polymer film to prevent surface rubbing. The spool frames are structural steel reinforced to prevent movement during containerized ocean shipment.
Supporting high-pressure lines, cable protection systems, and thermal exchange systems.
