Sihe Steel
Sihe Steel
Direct factory access to ASTM, DIN, and JIS standard precision seamless pipes, capillary tubes, and rolled industrial sheets.
Seamless 304 stainless steel tubing is the cornerstone of structural integrity in global critical piping system networks. Unlike welded tubing, which contains a heat-affected longitudinal weld seam prone to localized corrosion and mechanical stress concentration, seamless tubing is produced via hot extrusion or cold drawing. This ensures a homogeneous, isotropic grain structure throughout the pipe wall. The metallurgical footprint of Grade 304 (UNS S30400 / EN 1.4301) relies on a precise balance of Chromium (nominal 18%) and Nickel (nominal 8%), stabilizing the austenitic phase at room temperature and delivering exceptional chemical passivity.
| Specification Element | ASTM A213 (Boiler/Exchanger) | ASTM A269 (General Service) | EN 10216-5 (Pressure Purposes) |
|---|---|---|---|
| Chromium (Cr) % | 18.00 - 20.00 | 18.00 - 20.00 | 17.00 - 19.50 |
| Nickel (Ni) % | 8.00 - 11.00 | 8.00 - 11.00 | 8.00 - 10.50 |
| Carbon (C) % Max | 0.08 max | 0.08 max | 0.07 max |
| Hydrostatic Pressure | Mandatory NDT or Hydro | Optional / Accordance to A1016 | Mandatory Test Class 1 / Class 2 |
Established as a premier industrial node in China, Liaocheng sihe stainless steel material LTD has integrated advanced manufacturing routes to provide high-quality seamless coiled tubing, polished pipes, and custom structural configurations. Operating six modern production lines, our industrial facility is engineered to run in strict accordance with Chinese (GB), American (ASTM/ASME), Japanese (JIS), and European (EN) standards. Our material capabilities span a wide range of chemical profiles, including 304/304L, 316L, 321, 317L, 309S, 310S, and high-performance super-alloys such as INCOLOY 800.
Providing single continuous coil lengths up to 32,800 feet (10,000 meters) to reduce connection points in deep-water umbilical networks.
Outer diameter capacities ranging from 0.125 inch (3.175 mm) up to 1 inch (25.4 mm), with custom wall thicknesses up to 0.165 inch (3 mm).
Our metallurgy processing routes extend beyond basic grades into exotic and corrosion-resistant alloys (CRAs). We regularly supply specialized systems utilizing Austenitic steel 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625. These alloys are specifically engineered for deep geothermal wells, chemical processing vessels, hydraulic command lines, and defense aerospace instrumentation panels. By using state-of-the-art cold drawing benches, we maintain strict dimensional tolerances, ensuring excellent concentricity and surface finish.
Our commitment to modern manufacturing involves utilizing online bright annealing (BA) technology. Controlled environments containing pure dry hydrogen gas allow for high-temperature heat treatment above 1040°C, followed by rapid cooling. This process dissolves precipitated chromium carbides back into the austenitic solid solution, ensuring high mechanical ductility and restoring maximum corrosion resistance. The surface remains bright, smooth, and free of scale, preventing contamination in pharmaceutical pipelines or semiconductor cleanrooms.
Our stainless steel tubes are utilized in multiple industrial sectors worldwide, offering excellent corrosion resistance, high pressure ratings, and reliable field formability.
Designed for thermal transfer in power generation and chemical manufacturing plants.
Provides leak-free loops for refrigeration fluids, and heat pump loops.
Protects process instrumentation from harsh chemicals and acid vapor exposure.
Polished surfaces prevent bacterial growth, conforming to sanitary standards.
Supports sterile distribution networks for purified water and clean steam.
Stands up to high steam pressures and temperatures in thermal cycles.
Used in downhole control lines and subsea umbilicals for deep-water exploration.
Delivers high-pressure fuel lines and hydraulic systems under heavy vibration.
Leveraging Liaocheng’s industrial steel cluster, our facility coordinates direct sourcing of premium alloy billets from major local producers like TISCO and Baosteel. This localized structure reduces intermediate transportation costs, minimizes inventory risks, and ensures raw material traceability. Our integrated factory model handles melting, extrusion, cold drawing, heat treatment, and final inspection on-site, saving valuable lead time for our customers.
With an export distribution network extending to more than 30 countries—including the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe—our logistics system is optimized for international shipping. All export shipments are protected with customized packaging options, including sea-worthy wooden cases, steel frames, and end caps to prevent contamination during transport.
All operations are third-party certified to ensure full traceabilty and compliance with international standards.
Explore our main product lines designed to meet modern industrial piping requirements.
2205 duplex and 304/316L series stainless steel options. Minimizes connection points for subsea and downhole installations.
1/2-inch coiled tubing line featuring continuous wall structures. Engineered for high-temperature and high-pressure steam distribution.
High-temperature grade coil tubing designed for industrial furnace elements and heat treatment chambers.
Original production assets and plant machinery setups:
Browse our complete selection of stainless steel precision pipes, sheets, and heat exchanger components.
