Cold-rolled stainless steel sheets with a NO.4 finish have a smooth, matte surface with a pattern of very fine, parallel lines. The NO.4 finish is achieved by using abrasive belts or brushes to create a consistent pattern on the surface of the steel.

Compared to a HL finish, which has a brushed appearance, a NO.4 finish has a more uniform appearance with a lower reflectivity. This makes it a popular choice for applications where a decorative, yet not too shiny finish is desired, such as kitchen appliances, elevator panels, and architectural trim.

In summary, a cold-rolled stainless steel sheet with a NO.4 finish has a smooth, matte surface with a pattern of very fine, parallel lines. It has a more uniform appearance with a lower reflectivity compared to a HL finish and is often used in applications where a decorative, yet not too shiny finish is desired.