• SEAMLESS TUBES IN VARIOUS SIZES, ALLOYS AND HARDNESS.

Hardness equivalents

Comparative table of approximate hardness values

Vickers Hardness Number Brinell Hardness Number Rockwell Hardness Number Rockwell Superficial Hardness Number
B Scale C Scale 15-T  scale 30-T scale 45-T Scale
Vickers Indenter 1, 5, 10, 30-kgf 10-mm Standard Ball, 3000-kgf 100-kgf, 1/16″ (1,588 mm) Ball 150-kgf Diamond Pene- trator 15-kgf, 1/16″ (1,588 mm) Ball 30-kgf, 1/16″ (1,588 mm) Ball 45-kgf, 1/16″ (1,588 mm) Ball
HV HBS HRB HRC HR 15-T HR 30-T HR 45-T
513 479 50,0
481 450 48,0
452 425 46,0
427 403 44,0
404 382 42,0
382 363 40,0
362 346 38,0
344 329 36,0
326 313 34,0
309 298 106 32,0 94,5 85,5 77,0
285 275 104 28,5 94,0 84,5 75,0
266 258 102 25,5 93,0 83,0 73,0
248 241 100 22,5 92,5 81,5 71,0
234 228 98 20,0 92,0 80,5 69,0
220 215 96 17,0 91,0 79,0 67,0
209 204 94 14,5 90,5 77,5 65,0
198 194 92 12,0 89,5 76,0 63,0
188 184 90 9,0 89,0 75,0 61,0
179 176 88 6,5 88,0 73,5 59,5
171 168 86 4,0 87,5 72,0 57,5
164 161 84 2,0 87,0 70,5 55,5
157 155 82 86,0 69,5 53,5
151 149 80 85,5 68,0 51,5
145 144 78 84,5 66,5 49,5
140 139 76 84,0 65,5 47,5
135 134 74 83,0 64,0 45,5
130 129 72 82,5 62,5 43,5
126 125 70 82,0 61,0 41,5
122 121 68 81,0 60,0 39,5
119 118 66 80,5 58,5 37,5
115 114 64 79,5 57,0 35,5
112 111 62 79,0 56,0 33,5
108 108 60 78,5 54,5 31,5
106 106 58 77,5 53,0 29,5
103 103 56 77,0 51,5 27,5
100 100 54 76,0 50,5 25,5
98 98 52 75,5 49,0 23,5
95 95 50 74,5 47,5 21,5