Surface finish is not just about appearance. It affects corrosion resistance, cleanability, friction, and how the material interacts with other components. For stainless steel, different applications require different finish levels — from industrial-grade matte to mirror-like reflective.

Common Stainless Steel Surface Finishes

No. 1 – Hot rolled, annealed, and pickled

• Rough, dull, and non-reflective
• Typically used for thick plates in high-temperature or high-pressure applications (boilers, pressure vessels)
• Not meant for decorative or sanitary uses

No. 2B – Cold rolled, bright heat treated, pickled, and skin passed

• Smooth, moderately reflective (not a true mirror)
• The most common finish for general industrial applications
• Ideal for tanks, piping, kitchen equipment, and automotive trim
• Accepts further polishing if needed

No. 2D – Dull cold rolled finish

• Matte appearance with very low reflectivity
• Used where glare reduction or uniform surface appearance is required
• Common in architectural panels and industrial enclosures

No. 3 – Intermediate polished finish

• Semi-reflective with visible grinding lines (typically 80–100 grit)
• Used as a base for further finishing or where moderate reflectivity is acceptable
• Often specified for some architectural and food handling equipment

No. 4 – Brushed finish

• Satin appearance with fine, uniform polish lines (typically 120–180 grit)
• Very common for kitchen equipment, handrails, restaurant surfaces, and hospital fixtures
• Hides fingerprints and minor scratches better than mirror finishes
• Easy to clean and sanitize

No. 6 – Dull satin finish

• Less reflective than No. 4, with lower grit polish (200–240 grit)
• Provides a softer, less glossy appearance
• Sometimes used for architectural panels and furniture

No. 7 – High reflective finish

• Near-mirror appearance but with some visible polishing lines
• Requires careful handling to avoid scratches
• Used for decorative columns, wall panels, and some food processing equipment

No. 8 – Mirror finish

• True mirror-like reflective surface with no visible lines
• Achieved by progressive polishing with very fine abrasives
• Most expensive among standard finishes
• Used for decorative architectural elements, elevator interiors, and high-end appliances
• Also specified for some sanitary and pharmaceutical applications where extreme cleanability is needed

Specialized Finishes

BA (Bright Annealed)

• Cold rolled and bright annealed under controlled atmosphere
• Highly reflective, similar to No. 8 but produced without mechanical polishing
• Common for thin sheets and coils in decorative or kitchen applications

Scotch-Brite / Non-directional (Grained)

• Uniform matte finish with no visible direction
• Hides scratches and wear very well
• Used for escalator panels, building cladding, and consumer goods

Pickled finish

• Chemically cleaned to remove scale and oxides after heat treatment or welding
• Matte, gray appearance
• Essential for restoring corrosion resistance after high-temperature processes

How to Choose the Right Finish

Important Notes

• Cost increases with reflectivity – No. 8 mirror finish costs significantly more than No. 2B or No. 4.
• Surface finish affects corrosion resistance – Smoother finishes have fewer crevices and generally perform better in corrosive environments.
• Post-weld finishing is required – Welding destroys the original finish and oxide layer. Pickling or mechanical polishing must be done after welding to restore corrosion resistance.
• Specify by standard – Always reference ASTM A480 or EN 10088-2 when ordering to avoid confusion.