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.

Vickers Diamond Pyramid Hardness (Rockwell C/B Hardness)

Material	800°F	(425°C)	1000°F	(540°C)	1200°F	(650°C)	1400°F	(760°C)	1600°F	(870°C)

242^® alloy	271	(R_C 26)	263	(R_C 24)	218	(R_B 95)	140	(R_B 75)	78
Alloy 6B	269	(R_C 26)	247	(R_C 22)	225	(R_B 98)	153	(R_B 81)	91
Alloy 25	171	(R_B 87)	160	(R_B 83)	150	(R_B 80)	134	(R_B 74)	93
Alloy 188	170	(R_B 86)	159	(R_B 83)	147	(R_B 77)	129	(R_B 72)	89
230^® alloy	142	(R_B 77)	139	(R_B 76)	132	(R_B 73)	125	(R_B 70)	75
556^® alloy	132	(R_B 73)	129	(R_B 72)	118	(R_B 67)	100	(R_B 55)	67

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HAYNES® 242® alloy Information

An age-hardenable Ni-Mo-Cr alloy that combines high-temperature strength, low thermal expansion characteristics and good oxidation-resistance for service to 1400°F (760°C). Also resistance to high-temperature fluorine and fluoride environments.

HAYNES^® 242^® alloy Information

An age-hardenable Ni-Mo-Cr alloy that combines high-temperature strength, low thermal expansion characteristics
and good oxidation-resistance for service to 1400°F (760°C). Also resistance to high-temperature fluorine and fluoride environments.