CROSS REFERENCE FOR HARDNESS OF STEEL - Hardness conversions, Ningbo, China, Wanchai, Hong Kong, Tube Components & Metal Stampings

Cross Reference for hardness of steel

Note: Hardness conversions are approximate only, a s different scales use different methods of testing

Brinell Impression	Brinell Hardness	Vickers hardness	Rockwell Hardness (HRB)	Rockwell Hardness (HRC)	Tensile Strength
Brinell Impression	Brinell Hardness	Vickers hardness	Rockwell Hardness (HRB)	Rockwell Hardness (HRC)	Equiv Rm tonf/in²	Equiv Rm kgf/mm²	Equiv Rm N/mm²	( Approx) 1000 psi
Dia. mm	HB	HV	B	C	Equiv Rm tonf/in²	Equiv Rm kgf/mm²	Equiv Rm N/mm²	( Approx) 1000 psi
2.50	601	640	-	57.0	-	-	-	328
2.55	578	615	-	56.0	-	-	-	313
2.60	555	591	120	54.5	-	-	-	298
2.65	534	569	119	53.5	-	-	-	288
2.70	514	547	119	52.0	-	-	-	274
2.75	495	528	117	51.0	-	-	-	264
2.80	477	508	117	49.5	-	-	-	252
2.85	461	491	116	48.5	101	160	1569	242
2.90	444	474	115	47.0	98	155	1520	230
2.95	429	455	115	45.5	95	150	1471	219
3.00	415	440	114	44.5	92	145	1422	212
3.05	401	425	113	43.0	88	139	1363	202
3.10	388	410	112	42.0	85	134	1314	193
3.15	375	396	112	40.5	82	129	1265	184
3.20	363	383	110	39.0	80	126	1236	177
3.25	352	372	110	38.0	77	121	1187	171
3.30	341	360	109	36.5	75	118	1157	164
3.35	331	350	109	35.5	73	114	1118	159
3.40	321	339	108	34.5	71	111	1089	153
3.45	311	328	108	33.0	68	107	1049	149
3.50	302	319	107	32.0	66	104	1020	146
3.55	293	309	106	31.0	64	101	990	141
3.60	285	301	105	30.0	63	99	971	138
3.65	277	292	104	29.0	61	96	941	134
3.70	269	284	104	27.5	59	93	912	130
3.75	262	276	103	26.5	58	91	892	127
3.80	255	269	102	25.5	56	89	873	124
3.85	248	261	102	24.0	55	87	853	120
3.90	241	253	100	23.0	53	84	824	116
3.95	235	247	99	22.0	51	81	794	114
4.00	229	241	98	20.5	50	79	775	111
4.05	223	235	97	-	49	77	755	104
4.10	217	228	96	-	48	76	745	103
4.15	212	223	96	-	46	73	716	100
4.20	207	218	95	-	45	71	696	99
4.30	197	208	93	-	43	68	667	94
4.40	187	197	91	-	41	65	637	90
4.50	179	189	89	-	39	62	608	88
4.60	170	179	87	-	36	57	559	84
4.70	163	172	85	-	35	55	539	82
4.80	156	165	83	-	34	54	530	80
4.90	149	157	81	-	32	51	500	73
5.00	143	150	79	-	31	49	481	71
5.10	137	144	77	-	31	49	481	67
5.20	131	138	74	-	30	47	461	65
5.30	126	133	72	-	29	46	451	63
5.40	121	127	70	-	28	44	431	60
5.50	116	122	68	-	27	43	422	58
5.60	111	117	66	-	26	41	402	56

Disclaimer: This table lists approximate relationship of hardn ess values to corresponding approximate tensile str ength values of steels. Some compositions and proce ssing histories may deviate from these relationships. The data in this table do not represent hardness-to-te nsile strength conversions for austenitic, ferritic , and martensitic stainless steel. If more precise conversions are required, th ey should be developed for each specific compositio n and heat treatment. Related Rockwell superficial hardness numbers, if of interest, may be found in ASTM A 370-68.

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