It is also possible to produce steel balls with hardness on the surface not less than 56 HRc ensuring capacity hardness is not less than 55 HRc.
|
Tentative diameter, mm |
Nominal diameter, mm |
Limiting deviation as per nominal diameter, mm |
Calculative nominal mass, kg |
|
| |||
|
30 |
31.5 |
± 2 |
0.128 |
|
| |||
|
40 |
41.5 |
± 2 |
0.294 |
|
| |||
|
50 |
52.0 |
± 3 |
0.58 |
|
| |||
|
60 |
62.0 |
± 3 |
0.98 |
|
| |||
The following groups of steel balls are produced:
-
of normal hardness of general use;
-
of extra-high hardness of general use;
-
of high hardness;
-
of super-high hardness.
|
Hardness HRC (HB) for groups, not less | ||||
|
1 |
2 |
3 |
4 |
4 |
|
on the ball surface |
for 1/2 rad. | |||
|
43 (401) |
49 (461) |
55 (534) |
55 (534) |
45 (415) |