304 Stainless Steel Round Discs Sheet Plate Dia 150/200/250/300mm, Thick 1mm~3mm

Measure the opening or footprint your disc needs to cover or fit into, then select the next size up to allow for trimming or drilling. For flanges, match the disc diameter to the outer flange OD of your fitting. For decorative or template use, the disc can be used as-cut at the listed diameter.

For light-duty backing plates or decorative applications, 1mm–1.5mm is typically sufficient. For load-bearing flanges, weld backing, or heat shields subject to mechanical stress, 2mm–3mm provides greater rigidity. When in doubt, go one step thicker — the weight difference between 2mm and 3mm on a Ø150mm disc is modest.

304 SS offers strong resistance to atmospheric corrosion and moisture in most outdoor environments. However, it is not fully immune — prolonged exposure to chloride-rich environments (coastal salt air, road de-icing salts) can cause surface staining or pitting over time. For marine or high-chloride settings, 316-grade stainless steel is the more appropriate choice.

Yes. 304 SS can be TIG or MIG welded to mild steel using 309L filler rod, which bridges the dissimilar metal joint. When welding 304 to 304, use 308L filler. Avoid welding to 400-series (ferritic/martensitic) stainless without consulting a welding procedure specification, as the joint properties differ significantly.

Machine-cut edges are consistent in profile but may have minor burrs depending on the cutting method. For applications where the edge will be handled frequently or where a smooth seating surface is needed, a quick pass with a deburring tool, file, or flap disc on an angle grinder will bring the edge to a clean finish. For purely structural or hidden applications, the as-cut edge is generally acceptable.

304 stainless steel is widely used in food processing and commercial kitchen equipment due to its corrosion resistance and ease of cleaning. However, the 2B mill finish on these discs is not a polished or electropolished surface. If your application requires a sanitary finish (e.g., Ra ≤ 0.8 µm), you would need to polish the surface after purchase. The base material itself is food-grade compatible.

Smaller discs are frequently used in pairs — for example, as matched end caps, symmetrical mounting plates, or paired templates. The 2-piece pack for Ø100mm reflects this common use pattern and offers better value for those applications. Larger diameters (Ø150mm and above) are more often used individually, so single-piece pricing keeps the cost proportional to the material involved.