HRC Hardness Converter for Steel (ASTM E140)

Hardness Conversions + Estimated Tensile Strength (MPa) for Steels (indicative).

Disclaimer: Conversions are approximate. Estimated tensile strength values depend on material composition, microstructure, heat treatment condition, section size, and testing method. Shown values are for information purposes only.

HRC

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HRB

—

HB (Brinell)

—

HV (Vickers)

—

Estimated Ultimate Tensile Strength (MPa)

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Metallurgical Condition / Structure (Typical)

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Metallurgical Structure (indicative):

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Conversion Basis & Standards:

Hardness conversions (HRC, HRB, HB, HV) are based on empirical conversion tables for steels as per ASTM E140, ISO 18265, and ASM Handbook references.
Values are obtained using interpolation between standard chart points and are approximate.
Estimated tensile strength (MPa) is derived from Brinell hardness using commonly accepted empirical correlations for carbon and low-alloy steels.

Reference Table: Steel hardness conversion chart

All values approximate.

HRC	HB	HV	HRB	UTS (MPa)*
68	920	940	—	3174
67	895	900	—	3088
66	870	865	—	3002
65	739	832	—	2550
64	722	800	—	2491
63	705	772	—	2432
62	688	746	—	2374
61	670	720	—	2312
60	654	697	—	2256
59	634	674	—	2187
58	615	653	—	2122
57	595	633	—	2053
56	577	613	—	1991
55	560	595	—	1932
54	543	577	—	1873
53	525	560	—	1811
52	512	544	—	1766
51	496	528	—	1711
50	481	513	—	1659
49	469	498	—	1618
48	455	484	—	1570
47	443	471	—	1528
46	432	458	—	1490
45	421	446	—	1452
44	409	434	—	1411
43	400	423	—	1380
42	390	412	—	1346
41	381	402	—	1314
40	371	392	—	1280
39	362	382	—	1249
38	353	372	—	1218
37	344	363	—	1187
36	336	354	—	1159
35	327	345	—	1128
34	319	336	—	1101
33	311	327	—	1073
32	301	318	—	1038
31	294	310	—	1014
30	286	302	—	987
29	279	294	—	963
28	271	286	—	935
27	264	279	—	911
26	258	272	—	890
25	253	266	—	873
24	247	260	—	852
23	243	254	—	838
22	237	248	—	818
21	231	243	—	797
20	226	238	—	780
Soft range reference (HRB) – ASTM E140 Table 2
—	240	240	100	828
—	234	234	99	807
—	228	228	98	787
—	222	222	97	766
—	216	216	96	745
—	210	210	95	725
—	205	205	94	707
—	200	200	93	690
—	195	195	92	673
—	190	190	91	656
—	185	185	90	638
—	180	180	89	621
—	176	176	88	607
—	172	172	87	593
—	169	169	86	583
—	165	165	85	569
—	162	162	84	559
—	159	159	83	549
—	156	156	82	538
—	153	153	81	528
—	150	150	80	518
—	147	147	79	507
—	144	144	78	497
—	141	141	77	486
—	139	139	76	480
—	137	137	75	473
—	135	135	74	466
—	132	132	73	455
—	130	130	72	449
—	127	127	71	438
—	125	125	70	431
—	123	123	69	424
—	121	121	68	417
—	119	119	67	411
—	117	117	66	404
—	116	116	65	400
—	114	114	64	393
—	112	112	63	386
—	110	110	62	380
—	108	108	61	373
—	107	107	60	369
—	106	106	59	366
—	104	104	58	359
—	103	103	57	355
—	101	101	56	348
—	100	100	55	345
—	99	99	54	342
—	98	98	53	338
—	97	97	52	335
—	96	96	51	331
—	95	95	50	328
—	94	94	49	324
—	93	93	48	321
—	92	92	47	317
—	91	91	46	314
—	90	90	45	311
—	89	89	44	307
—	88	88	43	304
—	87	87	42	300

*UTS (MPa) is indicative only for steels (empirical correlation using HB). Do not use as a substitute for tensile testing.