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Surface appearance
In the table, surface appearance is defined in terms of brightness and color. Stainless steels are not usually color tempered and are, therefore, not delivered in codes 6 and 7.
Surface appearance
| Code |
Surface |
Definition |
| 0 |
No requirements |
Normally an oxidized surface for which there are no appearance requirements. |
| 2 |
Dull |
Dull smooth surface. |
| 3 |
Bright |
Normal bright smooth surface. |
| 4 |
Very bright |
Mirror surface meeting very stringent requirements on uniform appearance. |
| 6 |
Yellow |
Yellow, oxidized surface with uniform color. |
| 7 |
Blue |
Blue, oxidized surface with uniform color. |
| 8 |
White |
Surface free from oxide discoloration and with uniform color. |
| 9 |
Special |
Surface as specified by customer. | Surface roughness
Surface roughness is measured with a special trailing stylus instrument. The relevant terminology and measuring methods can be found in EN ISO 4287 and EN ISO 4288.
Surface roughness
| Class |
Class limit Ra µm (µin.) |
Class mean Ra µm (µin.) |
| Y2 |
3.2- 8 (126-315) |
5.0 (197) |
| Y3 |
1.6- 4 (63-157) |
2.5 (98) |
| Y4 |
0.8- 2 (31- 79) |
1.25 (49) |
| Y5 |
0.4- 1 (16- 39) |
0.63 (25) |
| Y6 |
0.2- 0.5 (8- 20) |
0.32 (13) |
| Y7 |
0.1- 0.25 (4- 10) |
0.16 (6) |
| Y8 |
0.05- 0.125 (2- 5) |
0.08 (3) | |
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