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Surface quality classes for Hot-rolled bar and Rod Tab. 1 EN 10221
| Class |
nominal diameter
dN mm |
the permissible maximum depth of the superficial discontinuities mm |
| A |
5 < |
dN |
< 25 |
0,50 |
| 25 < |
dN |
< 150 |
0,02 x dN |
| B |
5 < |
dN |
< 12 |
0,20 |
| 12 < |
dN |
< 18 |
0,25 |
| 18 < |
dN |
< 30 |
0,30 |
| 30 < |
dN |
< 150 |
0,01 x dN |
| C |
5 < |
dN |
< 12 |
0,17 |
| 12 < |
dN |
< 30 |
0,23 |
| 30 < |
dN |
< 120 |
0,0075 x dN |
| D |
5 < |
dN |
< 12 |
0,15 |
| 12 < |
dN |
< 40 |
0,20 |
| 40 < |
dN |
< 60 |
0,005 x dN |
| 60 < |
dN |
< 80 |
0,30 |
| E |
5 < |
dN |
< 60 |
ª |
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| ª this class of surface quality must be better than the D class. The prescription and the method of control must be agreed between the parts. |
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