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Hot Hardness Data

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/B scale.

Alloy 800°F (425°C) 1000°F (540°C) 1200°F (650°C) 1400°F (760°C) 1600°F (870°C)
Vickers Rockwell Vickers Rockwell Vickers Rockwell Vickers Rockwell Vickers Rockwell
242® 271 26 HRC 263 24 HRC 218 95 HRBW 140 75 HRBW 78 -
6B 269 26 HRC 247 22 HRC 225 98 HRBW 153 81 HRBW 91 -
25 171 87 HRBW 160 83 HRBW 150 80 HRBW 134 74 HRBW 93 -
188 170 86 HRBW 159 83 HRBW
147 77 HRBW 129 72 HRBW 89 -
230® 142 77 HRBW 139 76 HRBW 132 73 HRBW 125 70 HRBW 75 -
556® 132 73 HRBW 129 72 HRBW 118 67 HRBW 100 56 HRBW 67 -

HRBW = Hardness Rockwell “B”, Tungsten Indentor.
HRC = Hardness Rockwell “C”.

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