Hardness Conversion Chart

ROCKWELL HARDNESSROCKWELL HARDNESSBRINELL HARDNESSVICKERS HARDNESSTENSILE STRENGTHPSI (1000lb/in2)
(HRb)(HRc)(HB)(HV)(N/mm2)
67–12112240158
70–12612743263
73–13213244865
75–13613745566
77–14014346367
80–14715047969
82–15315649472
84–15916352576
86–16517154078
89–17717855681
91–18618860288
93–19719663292
96–21621266497
97–223218695101
9821230234756110
–22236241772112
–23242247787114
–24248255818118
–25254261849123
–27266269865125
–28272275895130
–29278284911132
–30284292942136
–31293300973141
–32302308988143
–333103181019147
–343193271050152
–353283371096159
–373453491127163
–383533591158168
–393623701189172
–403703811235179
–413813951266183
–423914081312190
–444114221359197
–454224371420206
–464334521467212
–484554701513219
–504794971559226
–514855171621235
–524975321668241
–54–5731729250
–56–6091807262
–57–6301884273
–59–6701961284
–60–6982039295
–61–725––
–62–740––
–63–780––
–64–812––
–65–847––
–66–885––
–67–926––
–68–971––

Conversions from each scale are approximate