ASTM 316 No 4 hairline finish stainless steel

As a benchmark material for austenitic stainless steel, ASTM 316 No.4 forms a unique hairline finish through surface drawing technology, combining functionality and decorative value. Its molybdenum content reaches 2% -3%, significantly improving its resistance to pitting corrosion in chloride environments. The addition of nitrogen further enhances its mechanical properties, increasing the yield strength by more than 20% compared to standard 316 steel.

This surface treatment adopts continuous directional grinding technology, with the depth of the grain controlled within the range of 0.01-0.03mm, which retains the metallic texture and avoids the accumulation of dirt and grime. The surface smoothness standard of No.4 requires Ra ≤ 0.4μm, with a reflectivity maintained between 35-45%, forming a soft matte effect, especially suitable for scenes with strict hygiene requirements such as medical equipment, food processing equipment, and high-end building curtain walls.