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Steel (B Scale)

Approximate Hardness Conversion Numbers
for Non-Austenitic Steels

Rockwell B Hardness No. 100 Kgf (HRB)	Vicker’s Hardness Number (HV)	Brinell Hardness No. 10mm Standard Ball, 3000 Kgf (HBS)	Knoop Hardness Number 500 gf & Over (HK)
100	240	240	251
99	234	234	246
98	228	228	241
97	222	222	236
96	216	216	231
95	210	210	226
94	205	205	221
93	200	200	216
92	195	195	211
91	190	190	206
90	185	185	201
89	180	180	196
88	176	176	192
87	172	172	188
86	169	169	184
85	165	165	180
84	162	162	176
83	159	159	173
82	156	156	170
81	153	153	167
80	150	150	164
79	147	147	161
78	144	144	158
77	141	141	155
76	139	139	152
75	137	137	150
74	135	135	147
73	132	132	145
72	130	130	143
71	127	127	141
70	125	125	139
69	123	123	137
68	121	121	135
67	119	119	133
66	117	117	131
65	116	116	129
64	114	114	127
63	112	112	125
62	110	110	124
61	108	108	122
60	107	107	120

Rockwell Hardness Number A Scale, 60 Kgf (HRA)	Rockwell Hardness Number F Scale, 60 Kgf (HRF)	Rockwell Superficial Hardness No. 15T Scale, 15 Kgf (15T)	Rockwell Superficial Hardness No. 30T Scale, 30 Kgf (30T)	Rockwell Superficial Hardness No. 45T Scale, 45 Kgf (45T)
61.5	…	93.1	83.1	72.9
60.9	…	92.8	82.5	71.9
60.2	…	92.5	81.8	70.9
59.5	…	92.1	81.1	69.9
58.9	…	91.8	80.4	68.9
58.3	…	91.5	79.8	67.9
57.6	…	91.2	79.1	66.9
57	…	90.8	78.4	65.9
56.4	…	90.5	77.8	64.8
55.8	…	90.2	77.1	63.8
55.2	…	89.9	76.4	62.8
54.6	…	89.5	75.8	61.8
54	…	89.2	75.1	60.8
53.4	…	88.9	74.4	59.8
52.8	…	88.6	73.8	58.8
52.3	…	88.2	73.1	57.8
51.7	…	87.9	72.4	56.8
51.1	…	87.6	71.8	55.8
50.6	…	87.3	71.1	54.8
50	…	86.9	70.4	53.8
49.5	…	86.6	69.7	52.8
48.9	…	86.3	69.1	51.8
48.4	…	86	68.4	50.8
47.9	…	85.6	67.7	49.8
47.3	…	85.3	67.1	48.8
46.8	99.6	85	66.4	47.8
46.3	99.1	84.7	65.7	46.8
45.8	98.5	84.3	65.1	45.8
45.3	98	84	64.4	44.8
44.8	97.4	83.7	63.7	43.8
44.3	96.8	83.4	63.1	42.8
43.8	96.2	83	62.4	41.8
43.3	95.6	82.7	61.7	40.8
42.8	95.1	82.4	61	39.8
42.3	94.5	82.1	60.4	38.7
41.8	93.9	81.8	59.7	37.7
41.4	93.4	81.4	59	36.7
40.9	92.8	81.1	58.4	35.7
40.4	92.2	80.8	57.7	34.7
40	91.7	80.5	57	33.7
39.5	91.1	80.1	56.4	32.7