904L Coil with Ra≤0.2μm: The Precision Rolling Technology Behind It

In high-end industries like pharmaceuticals, semiconductors, and food processing, surface smoothness is more than an aesthetic—it's a performance and hygiene requirement. That’s why 904L stainless steel coil with a surface roughness (Ra) ≤ 0.2μm have become a sought-after solution. But how is such a fine finish achieved?

The key lies in precision rolling technology—a combination of advanced cold rolling, polishing, and process control techniques. After initial hot rolling and annealing, the 904L coil undergoes multiple stages of cold reduction and temper rolling using mirror-polished work rolls. This ensures the surface is not only extremely smooth, but also free of scale, scratches, and micro-defects.

To reach Ra ≤ 0.2μm, mechanical polishing or bright annealing is often added post-rolling. These final treatments are performed in cleanroom environments, minimizing contamination and oxidation. The result is a surface that supports sterile contact, easy cleaning, and chemical resistance—crucial for tanks, tubing, and inner linings in sensitive environments.

Additionally, 904L stainless steel coil low carbon and high nickel-molybdenum content ensures excellent formability and corrosion resistance, even after intense surface processing.

Producing 904L coil with Ra ≤ 0.2μm is a high-precision process, combining advanced rolling technology with strict quality control. The result? A premium material ready for industries where surface quality isn’t optional—it’s essential.