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High-temperature Hardness

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.

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