Hardness Conversion Table

Hardness is one of the most commonly used criteria when evaluating the mechanical properties of metals and alloys. However, hardness can be measured using different test methods. Since each method has its own application technique and unit of measurement, hardness conversion tables are used to translate these values into equivalent results.

Why Are Hardness Conversion Tables Used?

To compare values obtained from different testing devices

To ensure compliance with international standards

To achieve consistency across systems used in various industries

Main Hardness Testing Methods

1. Vickers Hardness (HV)

Uses a pyramidal diamond indenter

Suitable for both small and large parts

Preferred in laboratory environments due to its precision on surfaces

2. Rockwell Hardness (HR)

Offers various scales: HRC, HRB, etc.

One of the most widely used methods in the industry

Easy to apply with short testing times

3. Brinell Hardness (HB or BHN)

Uses a steel or tungsten carbide ball

Suitable for large and rough-surfaced parts

Commonly used for cast iron and soft steels

How Is Hardness Converted?

Each method uses different indenters, forces, and calculation formulas. Therefore, direct mathematical conversions are usually not possible. Instead, experimental conversion tables based on international standards such as ASTM E140 are used.

VICKERS	ROCKWELL HR									BRINELL
DPH	ROCKWELL HR									BHN
HV/10	B	E	F	G	H	K	15-T	30-T	45-T	500kg	3000kg
254	100			83			93	82	72	201	240
248	99			81			93	82	71	195	234
243	98			79			93	81	70	189	228
238	97			78			92	81	69	184	222
234	97			77			92	80	69	181	218
230	96			76			92	80	68	179	214
226	96			75			92	80	68	177	210
222	95			74			92	79	67	175	208
217	95			73			92	79	67	171	205
213	94			73			91	79	66	169	203
208	93			71			91	78	66	167	200
204	92			70		100	91	78	65	163	195
200	92			69		100	91	77	64	162	193
196	91			68		100	90	77	64	160	190
192	90			66		99	90	76	63	157	185
188	89			64		98	90	76	62	154	180
184	88			63		97	90	75	61	151	176
180	87			61		97	89	75	60	148	172
176	86			59		96	89	74	59	145	169
172	85			58		95	89	74	58	142	165
168	84			56		94	88	73	57	140	162
164	83			54		93	88	72	56	137	159
160	82			53		92	88	72	55	135	156
156	81			51		91	87	71	54	133	153
152	80			49		91	87	70	53	130	150
148	79			48		90	87	70	52	128	147
144	78			46		89	86	69	51	126	144
141	77			44		88	86	68	50	124	141
139	76			43		87	86	68	49	122	139
137	75		100	41		86	85	67	49	120	137
135	74		99	39		85	85	66	48	118	135
132	73		99	38		85	85	66	47	116	132
130	72		98	36		84	84	65	46	114	130
127	71	100	98	35		83	84	64	45	112	127
125	70	100	97	33		82	84	64	44	110	125
123	69	99	96	31		81	83	63	43	109	123
120	68	98	96	30		80	83	62	42	107	121
118	67	98	95	28		79	83	62	41	106	119
116	66	97	95	27		78	82	61	40	104	117
115	65	96	94	25		78	82	60	39	102	116
114	64	96	94	24		77	82	60	38	101	114
113	63	95	93	22		76	81	59	37	99	112
112	62	95	92	21		75	81	58	36	98	110
111	61	94	92	19		74	81	57	35	96	108
110	60	93	91	18		73	81	57	34	95	107
108	59	93	91	16		72	80	56	32	94	106
107	58	92	90	15		71	80	55	31	92	104
106	57	91	90	13		71	80	55	30	91	102
105	56	91	89	12		70	79	54	29	90	101
104	55	90	88	10		69	79	53	28	89	99
103	54	90	88	9		68	79	53	27	87
102	53	89	87	7		67	78	52	26	86
101	52	88	87	6		66	78	51	25	85
100	51	88	86	4		65	78	51	24	84
100	50	87	86	3		65	77	50	23	83
99	49	87	85			64	77	49	22	82
98	48	86	85			63	77	49	21	81
97	47	85	84			62	76	48	20	80
96	46	85	83			61	76	47	19	79
95	45	84	83			60	76	46	18	79
95	44	84	82			59	75	46	17	78
94	43	83	82			58	75	45	16	77
93	42	82	81			58	75	44	15	76
92	41	82	81			57	74	44	14	75
91	40	81	80			56	74	43	13	74
90	39	80	79			55	74	42	11	74
90	38	80	79			54	73	42	10	73
89	37	79	78			53	73	41	9	72
88	36	79	78		100	52	73	40	8	71
88	35	78	77		100	52	72	40	7	71
87	34	77	77		99	51	72	39	6	70
87	33	77	76		99	50	72	38	5	69
86	32	76	75		99	49	71	38	4	68
86	31	76	75		98	48	71	37	3	68
85	30	75	74		98	47	71	36	2	67
85	29	74	74		98	46	70	36	1	66
84	28	74	73		97	45	70	35		66
84	27	73	73		97	45	70	34		65
83	26	73	72		97	44	69	33		65
83	25	72	71		96	42	69	33		64
82	24	71	71		96	42	69	32		64
82	23	71	70		96	41	68	31		63
81	22	70	70		95	40	68	31		63
81	21	70	69		95	39	68	30		62
80	20	69	69		95	38	68	29		62
80	19	68	68		94	38	67	29		61
79	18	68	67		94	37	67	28		61
79	17	67	67		93	36	67	27		60
78	16	67	66		93	35	66	26		60
78	15	66	66		93	34	66	26		59
77	14	65	65		92	33	66	25		59
77	13	65	65		92	32	65	24		58
76	12	64	64		92	32	65	24		58
76	11	64	64		91	31	65	23		57
75	10	63	63		91	30	64	22		57
75	9	62	62		91	29	64	22		56
74	8	62	62		90	28	64	21		56
74	7	61	61		90	27	63	20		56
73	6	61	61		90	26	63	20		55
73	5	60	60		89	26	63	19		55
72	4	59	60		89	25	62	18		55
72	3	59	59		88	24	62	17		54
71	2	58	58		88	23	62	17		54
71	1	58	58		88	22	61	16		53
70	0	57	57		87	21	61	15		53
HV/10	B	E	F	G	H	K	15-T	30-T	45-	500kg	3000kg