The following are results from standard vacuum furnace hot hardness tests. Values are given in originally measured DPH (Vickers) units and conversions to Rockwell C/BW scale in parentheses.
|
Vickers Diamond Pyramid Hardness (Rockwell C/BW Hardness)
|
|
70°F (20°C)
|
800°F (425°C)
|
1000°F (540°C)
|
1200°F (650°C)
|
1400°F (760°C)
|
|
Solution Treated
|
251
|
22 HRC
|
171
|
87 HRBW |
160
|
83 HRBW |
150
|
80 HRBW |
134
|
74 HRBW |
|
15% Cold-Work
|
348
|
35 HRC
|
254
|
23 HRC
|
234
|
97 HRBW |
218
|
95 HRBW |
-
|
-
|
|
20% Cold-Work
|
401
|
41 HRC |
318
|
32 HRC
|
284
|
27 HRC |
268
|
25 HRC
|
-
|
-
|
|
25% Cold-Work
|
482
|
48 HRC
|
318
|
32 HRC
|
200
|
30 HRC
|
286
|
28 HRC
|
-
|
- |
HRC = Hardness Rockwell “C”.
HRBW = Hardness Rockwell “B”, Tungsten Indentor.