HomeTechnique & ApplicationApproximate Hardness Conversion Numbers for Cartridge Brass (70% Copper 30% Zinc Alloy)

Approximate Hardness Conversion Numbers for Cartridge Brass (70% Copper 30% Zinc Alloy)

Vickers Hardness Number(HV) Rockwell Hardness Number Rockwell Superficial Hardness Number Brinell Hardness Number
B Scale,100-kgf, 1⁄16-in.(1.588-mm) Ball(HRB) F Scale, 60-kgf 1⁄16-in.(1.588-mm) Ball(HRF) 15-T Scale,15-kgf,1⁄16-in. (1.588-mm) Ball(HR15T) 30-T Scale, 30-kgf, 1⁄16-in.(1.588-mm) Ball(HR30T) 45-T Scale, 45-kgf, 1⁄16-in.(1.588-mm) Ball(HR45T) 500-kgf,10-mm Ball(HBS)
196 93.5 110.0 90.0 77.5 66.0 169
194 —— 109.5 —— —— 65.5 167
192 93.0 —— —— 77.0 65.0 166
190 92.5 109.0 —— 76.5 64.5 164
188 92.0 —— 89.5 —— 64.0 162
186 91.5 108.5 —— 76.0 63.5 161
184 91.0 —— —— 75.5 63.0 159
182 90.5 108.0 89.0 —— 62.5 157
180 90.0 107.5 —— 75.0 62.0 156
178 89.0 —— —— 74.5 61.5 154
176 88.5 107.0 —— —— 61.0 152
174 88.0 —— 88.5 74.0 60.5 150
172 87.5 106.5 —— 73.5 60.0 149
170 87.0 —— —— —— 59.5 147
168 86.0 106.0 88.0 73.0 59.0 146
166 85.5 —— —— 72.5 58.5 144
164 85.0 105.5 —— 72.0 58.0 142
162 84.0 105.0 87.5 —— 57.5 141
160 83.5 —— —— 71.5 56.5 139
158 83.0 104.5 —— 71.0 56.0 138
156 82.0 104.0 87.0 70.5 55.5 136
154 81.5 103.5 —— 70.0 54.5 135
152 80.5 103.0 —— —— 54.0 133
150 80.0 —— 86.5 69.5 53.5 131
148 79.0 102.5 —— 69.0 53.0 129
146 78.0 102.0 —— 68.5 52.5 128
144 77.5 101.5 86.0 68.0 51.5 126
142 77.0 101.0 —— 67.5 51.0 124
140 76.0 100.5 85.5 67.0 50.0 122
138 75.0 100.0 —— 66.5 49.0 121
136 74.5 99.5 85.0 66.0 48.0 120
134 73.5 99.0 —— 65.5 47.5 118
132 73.0 98.5 84.5 65.0 46.5 116
130 72.0 98.0 84.0 64.5 45.5 114
128 71.0 97.5 —— 63.5 45.0 113
126 70.0 97.0 83.5 63.0 44.0 112
124 69.0 96.5 —— 62.5 43.0 110
122 68.0 96.0 83.0 62.0 42.0 108
120 67.0 95.5 —— 61.0 41.0 106
118 66.0 95.0 82.5 60.5 40.0 105
116 65.0 94.5 82.0 60.0 39.0 103
114 64.0 94.0 81.5 59.5 38.0 101
112 63.0 93.0 81.0 58.5 37.0 99
110 62.0 92.6 80.5 58.0 35.5 97
108 61.0 92.0 —— 57.0 34.5 95
106 59.5 91.2 80.0 56.0 33.0 94
104 58.0 90.5 79.5 55.0 32.0 92
102 57.0 89.8 79.0 54.5 30.5 90
100 56.0 89.0 78.5 53.5 29.5 88
98 54.0 88.0 78.0 52.5 28.0 86
96 53.0 87.2 77.5 51.5 26.5 85
94 51.0 86.3 77.0 50.5 24.5 83
92 49.5 85.4 76.5 49.0 23.0 82
90 47.5 84.4 75.5 48.0 21.0 80
88 46.0 83.5 75.0 47.0 19.0 79
86 44.0 82.3 74.5 45.5 17.0 77
84 42.0 81.2 73.5 44.0 14.5 76
82 40.0 80.0 73.0 43.0 12.5 74
80 37.5 78.6 72.0 41.0 10.0 72
78 35.0 77.4 71.5 39.5 7.5 70
76 32.5 76.0 70.5 38.0 4.5 68
74 30.0 74.8 70.0 36.0 1.0 66
72 27.5 73.2 69.0 34.0 —— 64
70 24.5 71.8 68.0 32.0 —— 63
68 21.5 70.0 67.0 30.0 —— 62
66 18.5 68.5 66.0 28.0 —— 61
64 15.5 66.8 65.0 25.5 —— 59
62 12.5 65.0 63.5 23.0 —— 57
60 10.0 62.5 62.5 —— —— 55
58 —— 61.0 61.0 18.0 —— 53
56 —— 58.8 60.0 15.0 —— 52
54 —— 56.5 58.5 12.0 —— 50
52 —— 53.5 57.0 —— —— 48
50 —— 50.5 55.5 —— —— 47
49 —— 49.0 54.5 —— —— 46
48 —— 47.0 53.5 —— —— 45
47 —— 45.0 —— —— —— 44
46 —— 43.0 —— —— —— 43
46 —— 40.0 —— —— —— 42