Direct factory supply of high-precision stainless steel products with custom polishing treatments (BA, No.4, Hairline, Mirror No.8) designed for harsh processing and architectural environments.
Established in 2014, OES Metal (Oes Steel) has grown into a globally recognized leader in the metallurgy supply chain. Headquartered in the industrial hub of Wuxi, Jiangsu Province, China, our operations are backed by a state-of-the-art 5,000 square meter manufacturing facility and a highly skilled workforce of over 100 dedicated technical and operations specialists.
Our strategic location allows us to leverage Wuxi's premier steel processing cluster, integrating high-capacity slitting, advanced mirror polishing (No.8), precision coil tension leveling, and automated protective film lamination. We maintain strict control over every critical parameter—thickness tolerances, surface roughness (Ra), flatness, and edge conditions—delivering impeccable quality and engineering integrity.
Over the past decade, we have exported thousands of tons of high-performance stainless steel materials to clients across North America, South America, the Gulf countries, Africa, CIS, and Southeast Asia, building strong footprints in over 59 countries and regions.
At OES Metal, global standards aren't just a guideline; they are our baseline. Every batch of cold-rolled and hot-rolled sheets complies fully with international standards including ASTM A240, ASTM A276, ASME, EN 10088, and JIS G4305.
As industrial processes advance, surface conditioning has transitioned from an aesthetic choice to a critical functional requirement. Polished stainless steel sheets are key components in modern sanitary engineering, architectural facades, and aggressive chemical processing plants.
Different surface finishes serve specific functional purposes. A standard No.4 Satin Finish offers linear grit lines perfect for high-traffic food preparation surfaces, while a No.8 Super Mirror Finish yields an optical-grade reflective surface with a roughness value of Ra ≤ 0.1 μm. This smooth finish helps prevent microbial colonization and bacterial biofilm formation.
Mechanical polishing does more than create a bright look—it removes microscopic crevices where chlorides can settle and initiate pitting. Fine-grit polishing and passivation form a uniform chromium oxide protective layer (Cr2O3), extending the service life of materials in coastal and industrial environments.
Operating within Wuxi, Jiangsu—China's primary hub for stainless steel—gives us direct access to prime mills like Tisco and Baosteel. This cluster allows OES Metal to optimize processing, packaging, and logistics. Our integrated operations translate to shorter lead times and more competitive rates for global projects.
Selecting the appropriate alloy grade and surface finish is crucial for balancing cost with environmental durability. Whether you are engineering marine equipment, pharmaceutical storage systems, or architectural structures, each grade serves a specific functional role:
A reference guide for surface treatment roughness values (Ra) and target applications:
| Finish Name | Roughness (Ra) | Typical Application |
|---|---|---|
| BA (Bright Annealed) | ≤ 0.15 μm | Appliances, semiconductor tubes |
| No.4 / Satin | 0.2 - 0.6 μm | Food processing, elevators |
| Hairline | 0.3 - 0.8 μm | Architectural cladding, escalators |
| No.8 Mirror | ≤ 0.05 μm | Optical mirrors, marine parts |
Highly requested specifications designed to meet stringent industry standards across global supply chains.
Excellent tensile strength and corrosion resistance in marine environments.
Versatile alloy ideal for high-precision components and machining.
Fine tolerances and customized temper modes for precision stampings.
No.8 Mirror finish with clean slitted edges ready for profiling.
Ideal for fasteners, structural fittings, and precision turned parts.
Machined square profiles for mechanical frameworks and mountings.
Compliance certified bar stock for infrastructure construction projects.
Excellent high-temperature resilience, cold finished for accuracy.
Explore our major product series designed to meet diverse industrial needs, including high-pressure systems, decorative panel structures, and engineering frameworks.
Includes ASTM A312 welded/seamless pipes, 321 heat resistant tubing, and 304 square structural pipes.
Explore Pipes
From hot rolled 321 plate structures to mirror duplex 2205/2507 and patterned checker plates.
Explore Sheets
Precision cold-rolled slitting strips, 304 raw materials, and high-gloss mirror-polished coils.
Explore Coils
Hexagon bars, square rods, bright drawn rods, and flat structural profiles under ASTM A276 standard.
Explore BarsOur industrial processing line follows strict quality management steps to ensure surface consistency and mechanical integrity.
Evaluating thickness, edge profile, and internal structure of raw cold-rolled coils from leading domestic mills.
Multi-stage fine abrasive polishing processes to gradually lower the surface roughness (Ra value).
Thorough chemical wash to eliminate polish residues, oils, and metal dust, followed by clean hot-air drying.
Lamination with premium fiber/laser protection films (Novacel/Nitto) to safeguard the finish during downstream fabrication.
When importing polished stainless steel sheets, specifying the correct parameters helps avoid quality discrepancies and production delays:
We understand the challenges faced by engineering procurement departments: fluctuating material costs, shipping delays, and inconsistent chemical compositions. OES Metal addresses these concerns through structured pricing, reliable material sourcing, and efficient processing.
Whether you are coordinating custom sheet orders for architectural facades in South America, food processing equipment in North America, or desalination components in the Middle East, our technical staff works directly with your engineers to align every detail with project requirements.
Technical answers to key inquiries regarding specifications, processing methods, and applications.
A BA (Bright Annealed) finish is produced through heat treatment in a controlled atmosphere furnace, resulting in a bright, reflective surface with a slight haze. A No.8 Mirror finish is achieved by mechanically polishing BA or 2B sheets with fine abrasives and polishing compounds, yielding an optical-grade reflection with minimal haze.
Mechanical polishing generates localized heat, which can cause thin sheets to buckle. OES Metal utilizes wet polishing systems with liquid coolants to control temperatures, combined with tension levelers to keep the sheets flat throughout processing.
While 304 is suitable for inland, dry environments, coastal or polluted areas expose surfaces to airborne chlorides and sulfur oxides. Grade 316L contains 2-3% Molybdenum, which increases its resistance to pitting and crevice corrosion, preventing tea-staining on the polished surface.
We recommend using specialized Fiber Laser Film (such as 100-micron white/black PE films from Novacel or Nitto). Standard PE films can melt and adhere to the cut edges, whereas laser-rated films vaporize cleanly under fiber lasers without bubbling.
Yes, duplex grades can be polished. However, because duplex steel contains both austenite and ferrite phases, the phases wear at slightly different rates during abrasive polishing. This requires specialized speed, pressure, and compound adjustments to achieve a consistent mirror finish.
We trace each master coil to its original melt heat number. Every shipment includes certified mill test reports indicating the precise percentages of Chromium, Nickel, Molybdenum, Carbon, and other elements, in line with ASTM A240 requirements.
Complementary piping and structural products to complete your industrial systems.
Oes Steel
