Sihe Steel
Sihe Steel
Explore our precision-engineered stainless steel coiled tubing, heat exchanger pipes, and customized sheet portfolio built to comply with ASTM, ASME, JIS, and EN standards.
In modern industrial manufacturing and high-end architectural design, 304 Stainless Steel Sheet Mirror finishes represent the pinnacle of aesthetic design and mechanical integrity. Providing both outstanding reflectivity (up to Super 8K and 10K specifications) and high resistance to oxidation, these sheets serve critical roles in harsh environment settings, subsea equipment, biotechnology systems, and automotive styling. As major procurement hubs adapt to strict international regulations, understanding the supply dynamics, raw material traceabilities, and processing parameters is essential for high-performance deployment.
We leverage advanced optical gloss testing to measure standard 8K, Super 8K, and 10K reflectivity profiles, ensuring surface roughness (Ra) values remain consistently under 0.01 µm for flawless optical properties.
Every batch of our 304/304L and 316L mirror sheets is fully tested and verified against ASTM A240, JIS G4305, and EN 10088-2 requirements to ensure compliance in diverse international markets.
We apply high-grade double-layer fiber laser protective films (PE/Novacel 100µm) to prevent scratches, micro-abrasions, and pressure markings during critical fabrication and logistics transit.
Liaocheng Sihe Stainless Steel Material LTD stands as an industry leader in manufacturing high-performance stainless steel coiled tubing, precision polished tubes, and premium mirror sheets. Operating six advanced production lines and employing the latest bright annealing technology, we consistently manufacture products conforming strictly to GB, ASTM, ASME, JIS, and EN standards.
Advanced stainless steel processing facility in Liaocheng, China.
Our metallurgy processing encompasses premium austenitic series, duplex alloys, and high-performance super duplex grades. We support core materials including 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
With custom production capabilities, our coiled tubing is available in outer diameters ranging from 0.125 inches (3.175 mm) to 1 inch (25.4 mm), wall thickness up to 0.165 inches (3 mm), and continuous lengths of up to 32,800 feet (10,000 meters) for cost-effective offshore umbilical applications.
We pride ourselves on offering advanced surface treatment processes, including customized grinding and polishing configurations, to satisfy critical industrial specifications.
By implementing online bright annealing atmospheres (composed of high-purity hydrogen-nitrogen reduction gas), our tubes and sheets preserve clean, carbon-free surfaces with minimal structural deformation. Our strict internal testing protocol incorporates:
Hydrogen-protected online bright annealing system.
Liaocheng Sihe is not just a raw material manufacturer. We provide extensive secondary processing to ensure the raw stainless steel sheets and coils align directly with customer manufacturing assemblies.
We support various materials (including 304, 316L, 2205) and custom specifications ranging from 6.35 mm to 19 mm outer diameter for specialized industrial coiled systems.
We execute high-precision bending, spiral coil shaping, and multi-axis drawing optimized for heat exchangers, condenser units, and subsea pipelines.
Leveraging high-power fiber laser cutting machines, we produce sheets with clean, burr-free edges, maintaining tight tolerances within ±0.1 mm.
We provide advanced flanging processing designed for automotive exhaust connections, high-pressure chemical joints, and aerospace components.
Ensure you order the correct chemical profile, thickness, and finish parameters for your procurement. Below are the verified technical parameters for Liaocheng Sihe's 304 mirror sheets:
| Technical Property | Standard Specification (ASTM A240 / EN 10088-2) | Liaocheng Sihe Premium Grade Delivery |
|---|---|---|
| Chemical Composition - Chromium (Cr) | 18.0% - 20.0% | 18.2% - 19.5% (High stability profile) |
| Chemical Composition - Nickel (Ni) | 8.0% - 10.5% | 8.15% - 8.5% (Optimal mechanical ductility) |
| Reflectivity Level | Standard BA Finish / 8K Mirror | Super 8K & 10K Mirror Finish (Ra < 0.01 µm) |
| Thickness Tolerance Range | ±10% standard mill tolerance | ±0.02 mm precision thickness tolerance |
| Protective Coating Layer | Single layer PE film (50µm) | Double-sided high-adhesion Novacel laser protective film (80µm/100µm) |
| Max Width Capacity | Up to 1250 mm | Up to 1500 mm (Custom slitting available) |
| Tensile Strength (Rm) | ≥ 515 MPa | 520 - 620 MPa |
| Elongation (A50) | ≥ 40% | ≥ 45% (Excellent deep drawability) |
For international procurement teams, sourcing metal products from overseas requires absolute trust and documented verification. To meet localized regulatory compliance, Liaocheng Sihe provides complete traceability protocols for imports to the USA, EU, South America, and APAC.
Every shipment is accompanied by a certified EN 10204 3.1 Mill Test Certificate (MTC), showing detailed chemical ladle analysis, tensile test reports, and hardness checks.
We supply authenticated certificates of origin (Form A, Form E, CO) along with customs documents to simplify customs clearance processes for our global clients.
To avoid surface corrosion from ocean shipping moisture, we utilize vacuum-sealed, heavy-duty wooden crates containing moisture-absorbing desiccants and steel strapping.
From deepsea petrochemical exploration to sterile pharmaceutical production, our 304 and specialized alloy stainless steel products serve as core infrastructure components worldwide.
As the steel industry moves toward carbon-neutral manufacturing and higher precision tolerances, procurement managers face key decisions when choosing suppliers. Consider these trends to stay competitive:
Both European and US buyers must verify carbon emission profiles under standard CBAM regulations. Liaocheng Sihe is upgrading production lines to recycle water and implement energy-efficient bright annealing heaters, cutting environmental overhead while preserving strict alloy quality.
Premium architectural cladding and semiconductor chambers require surfaces with near-zero micro-scratches. Sourcing mirror sheets with an automated mechanical polishing line followed by chemical passivation ensures maximum corrosion resistance (PREN > 18) and high durability.
Our experienced logistics desk organizes multimodal shipments (FOB, CIF, DDP) that minimize tariff impacts. By utilizing strategically located port distribution centers, we keep container transport smooth and cost-efficient.
Industrial operations are increasingly moving away from standard catalog dimensions. Purchasing custom pre-cut and pre-annealed lengths minimizes manufacturing waste and reduces overall welding and fabrication time on site.
View our structural and mechanical pipe catalog, supporting JIS, ASTM, and DIN standards for industrial systems, exhaust setups, and heat transfer loops.
