 |
|
High Speed Tool Steels
|
|
Chemical Composition and Heat Treatment
|
|
DAIDO
BRAND |
Equivalent
to |
Chemical
Composition (%)
|
|
JIS
|
AISI
|
VDEh |
C |
Si |
Mn |
Cr |
Mo |
W |
V |
Co |
| MH51 |
SKH51 |
M2 |
S6-5-2 |
0.80-0.90 |
0.40 max. |
0.40 max. |
3.80-
4.50 |
4.50-5.50 |
5.50-6.70 |
1.60-2.20 |
- |
| MH55 |
SKH55 |
M35 |
S6-5-2-5 |
0.80-0.90 |
0.40 max. |
0.40 max. |
3.80-
4.50 |
4.80-6.20 |
5.50-6.70 |
1.70-2.30 |
4.50-5.50 |
| MH85 |
- |
- |
- |
0.55 |
0.3 |
0.3 |
4.2 |
4.0 |
2.0 |
1.0 |
- |
| DEX20 |
- |
- |
- |
1.3 |
0.3 |
0.3 |
4.0 |
5.0 |
6.5 |
3.0 |
- |
| DEX40 |
- |
- |
- |
1.3 |
0.3 |
0.3 |
4.0 |
5.0 |
6.5 |
3.0 |
8.0 |
| DEX60 |
- |
- |
- |
1,7 |
0.3 |
0.3 |
4.0 |
2.0 |
15.0 |
5.0 |
8.0 |
| DEX80 |
- |
- |
- |
2.1 |
0.3 |
0.3 |
4.0 |
6.0 |
14.0 |
5.5 |
12.0 |
|
|
DAIDO
BRAND |
Forging
Temperature
(℃) |
Heat Treatment(℃) |
Hardness |
|
Annealing
Temperature
|
Hardening
Temperature |
Quenching
Medium |
Tempering
Temperature |
Annealed
HB |
Tempered
HRC |
| MH51 |
1150-950 |
800-880 |
1160-1220 |
Oil,
Salt |
540-570 |
255
max. |
62
min. |
| MH55 |
1180-950 |
800-880 |
1180-1230 |
Oil,
Salt |
530-570 |
277
max. |
63
min. |
| MH85 |
1150-950 |
800-900 |
1080-1150 |
Oil,
Salt |
540-600 |
207
max. |
56
min. |
| DEX20 |
- |
800-880 |
1100-1180 |
Oil,
Salt |
540-580 |
285
max. |
62
min. |
| DEX40 |
- |
800-880 |
1130-1220 |
Oil,
Salt |
540-600 |
285
max. |
63
min. |
| DEX60 |
- |
820-900 |
1180-1220 |
Oil,
Salt |
520-570 |
311
max. |
66
min. |
| DEX80 |
- |
840-920 |
1180-1220 |
Oil,
Salt |
520-570 |
388
max. |
67
min. |
|
|
|
|
|
