Sihe Steel
Sihe Steel
Explore our premium selection of ASTM & JIS compliant piping, sheets, and coiled tubing direct from our production facility.
SUS 304 (equivalent to AISI 304 or EN 1.4301) represents the global gold standard for austenitic stainless steel. Characterized by its optimum composition of 18% chromium and 8% nickel, this grade features exceptional corrosion resistance across diverse chemical landscapes, high ductility, superb forming qualities, and outstanding weldability. As a premier manufacturer, Liaocheng Sihe Stainless Steel Material LTD leverages advanced metallurgical processing techniques to produce high-performance SUS 304 tubes optimized for high-pressure, cryogenic, and highly corrosive installations.
The corrosion resistance of SUS 304 stems from the spontaneous creation of an ultra-thin, chromium-rich passive oxide surface layer ($Cr_2O_3$). This layer protects the underlying metal matrix from oxidation, moisture, and chemical attacks. In high-purity applications, such as semiconductor manufacturing and biochemical synthesis, maintaining this passive layer is critical. We use professional-grade bright annealing (BA) treatment within a controlled pure hydrogen atmosphere. This process maintains absolute surface purity, prevents surface oxide formations, and enhances the pitting resistance of the tubing.
| Standard | Grade Designation | C (%) max | Mn (%) max | P (%) max | S (%) max | Si (%) max | Cr (%) | Ni (%) |
|---|---|---|---|---|---|---|---|---|
| ASTM A269 / A312 | TP304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 - 20.0 | 8.0 - 11.0 |
| JIS G3459 | SUS304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 - 20.0 | 8.0 - 10.5 |
| EN 10216-5 | 1.4301 | 0.07 | 2.00 | 0.045 | 0.015 | 1.00 | 17.5 - 19.5 | 8.0 - 10.5 |
Our company specializes in high-quality sheets, pipes, and coiled tubing to meet strict international standards.
Liaocheng Sihe Stainless Steel Material LTD is a leading expert in the production of stainless steel coiled tubes, polishing tubes, and seamless coiled tubing. Utilizing six advanced production lines, we support several critical global production standards, including GB, ASTM, ASME, JIS, and EN. Our manufacturing catalog features high-demand austenitic and duplex grades, including:
Our coiled tubing solutions are available in outer diameters ranging from 0.125 inch (3.175 millimeters) to 1 inch (25.4 millimeters), with wall thicknesses up to 0.165 inch (3 millimeters). For subsea umbilical operations and chemical pipeline applications, we supply seamless coils in continuous single lengths up to 32,800 feet (10,000 meters) without orbital welds. This maximizes system integrity and reduces installation costs.
Our facility features the industry's leading inline bright annealing technology. This enables high-temperature heat treatment under pure hydrogen atmospheres to prevent surface oxidation, resulting in a smooth, scale-free internal and external finish.
We implement multiple validation tests to guarantee reliability for high-pressure installations:
Over 80% of our precision coiled tubing is exported globally to more than 30 countries and regions, including the United States, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Discover our comprehensive product lines, manufactured to strict dimensional tolerances for specialized industrial applications.
Our duplex and austenitic seamless coils are engineered for high-pressure, subsea, and offshore umbilical applications.
Coiled Stainless Steel Tubing
Designed for industrial heat transfer systems, geothermal piping, and hydraulic control systems.
Stainless Steel Tubing Coils
Special grade 310/310S alloy coiled tubes are manufactured to resist oxidation in high-temperature settings.
China 310 Steel Coil Tubing
Ultra-fine precision micro-tubes optimized for chromatography, medical devices, and analytical instruments.
Stainless steel capillary tubing
Engineered for high thermal conductivity and corrosion resistance in condensers, evaporators, and boilers.
Stainless steel heat exchanger pipe
Structural plates and sheets available in hot-rolled or cold-rolled configurations for high-strength requirements.
Stainless Steel Sheet & PlateOur custom processing capabilities deliver precision-engineered metal products tailored to your exact specifications.
We support specialized dimensioning and metallurgy (304, 316L, 2205) for coil outer diameters ranging from 6.35mm to 19.05mm, customized to specific mechanical parameters.
We provide spiral forming, close-radius bending, and multi-axis alignment. These services are optimized for compact thermal exchangers and industrial instrumentation manifolds.
Using advanced laser cutting and high-precision mechanical straightening, we deliver exact lengths and straightness tolerances to prevent stress concentrations.
We offer electro-polishing, chemical passivation, and mechanical polishing. These treatments achieve low micro-inch Ra profiles, suitable for high-purity and cleanroom operations.
Precision end-forming and structural flanging are performed to ensure reliable, leak-free seals in automotive exhaust systems and industrial chemical processing pipelines.
We work closely with clients to develop custom alloy formulations and specialized tube shapes, resolving difficult engineering challenges across global supply chains.
Our stainless steel tubes provide dependable service in extreme, high-pressure, and high-temperature environments.
Our quality management systems and products are fully certified for export to demanding global markets.
The demand for industrial stainless steel tubing is shifting toward higher chemical purities, elevated operating pressures, and reduced lifecycle environmental impact. To address these trends, Liaocheng Sihe is upgrading its cold drawing and surface treatment lines to achieve cleaner, more efficient production.
Our technical development initiatives target three key areas:
By aligning our production with green metallurgy guidelines and optimizing heat recovery systems, we help global clients achieve their sustainability and scope-3 emission reduction goals.
Clear, direct answers regarding our ordering policies, custom production capabilities, and global distribution logistics.
Browse our specialized product catalog, featuring high-nickel alloys and precision stainless steel grades.
