phone-icon800.354.0806
765.456.6012
The Home of HASTELLOY® and
HAYNES® Alloys

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 in parentheses.

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

HRB = Hardness Rockwell “B”.
HRC = Hardness Rockwell “C”.

Print Page
Back to top