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Steel (C Scale)

Approximate Hardness Conversion Numbers
for Non-Austenitic Steels

Rockwell Hardness Number C Scale, 150 Kgf (HRC)	Vicker’s Hardness Number (HV)	Brinell Hardness No. 10mm Standard Ball, 3000 Kgf (HBS)	Brinell Hardness No. 10mm Carbide Ball, 3000 Kgf (HBW)	Knoop Hardness Number 500 gf & Over (HK)
68	940	…	…	920
67	900	…	…	895
66	865	…	…	870
65	832	…	…	846
64	800	…	…	822
63	772	…	…	799
62	746	…	…	776
61	720	…	…	754
60	697	…	…	732
59	674	…	634	710
58	653	…	615	690
57	633	…	595	670
56	613	…	577	650
55	595	…	560	630
54	577	…	543	612
53	560	…	525	594
52	544	…	512	576
51	528	…	496	558
50	513	…	481	542
49	498	…	469	526
48	484	451	455	510
47	471	442	443	495
46	458	432	432	480
45	446	421	421	466
44	434	409	409	452
43	423	400	400	438
42	412	390	390	426
41	402	381	381	414
40	392	371	371	402
39	382	362	362	391
38	372	353	353	380
37	363	344	344	370
36	354	336	336	360
35	345	327	327	351
34	336	319	319	342
33	327	311	311	334
32	318	301	301	326
31	310	294	294	318
30	302	286	286	311
29	294	279	279	304
28	286	271	271	297
27	279	264	264	290
26	272	258	258	284
25	266	253	253	278
24	260	247	247	272
23	254	243	243	266
22	248	237	237	261
21	243	231	231	256
20	238	226	226	251

Rockwell Hardness Number A Scale, 60 Kgf (HRA)	Rockwell Hardness Number D Scale, 100 Kgf (HRD)	Rockwell Superficial Hardness No. 15N Scale, 15 Kgf (15N)	Rockwell Superficial Hardness No. 30N Scale, 30 Kgf (30N)	Rockwell Superficial Hardness No. 45N Scale, 45 Kgf (45N)
85.6	76.9	93.2	84.4	75.4
85	76.1	92.9	83.6	74.2
84.5	75.4	92.5	82.8	73.3
83.9	74.5	92.2	81.9	72
83.4	73.8	91.8	81.1	71
82.8	73	91.4	80.1	69.9
82.3	72.2	91.1	79.3	68.8
81.8	71.5	90.7	78.4	67.7
81.2	70.7	90.2	77.5	66.6
80.7	69.9	89.8	76.6	65.5
80.1	69.2	89.3	75.7	64.3
79.6	68.5	88.9	74.8	63.2
79	67.7	88.3	73.9	62
78.5	66.9	87.9	73	60.9
78	66.1	87.4	72	59.8
77.4	65.4	86.9	71.2	58.6
76.8	64.6	86.4	70.2	57.4
76.3	63.8	85.9	69.4	56.1
75.9	63.1	85.5	68.5	55
75.2	62.1	85	67.6	53.8
74.7	61.4	84.5	66.7	52.5
74.1	60.8	83.9	65.8	51.4
73.6	60	83.5	64.8	50.3
73.1	59.2	83	64	49
72.5	58.5	82.5	63.1	47.8
72	57.7	82	62.2	46.7
71.5	56.9	81.5	61.3	45.5
70.9	56.2	80.9	60.4	44.3
70.4	55.4	80.4	59.5	43.1
69.9	54.6	79.9	58.6	41.9
69.4	53.8	79.4	57.7	40.8
68.9	53.1	78.8	56.8	39.6
68.4	52.3	78.3	55.9	38.4
67.9	51.5	77.7	55	37.2
67.4	50.8	77.2	54.2	36.1
66.8	50	76.6	53.3	34.9
66.3	49.2	76.1	52.1	33.7
65.8	48.4	75.6	51.3	32.5
65.3	47.7	75	50.4	31.3
64.8	47	74.5	49.5	30.1
64.3	46.1	73.9	48.6	28.9
63.8	45.2	73.3	47.7	27.8
63.3	44.6	72.8	46.8	26.7
62.8	43.8	72.2	45.9	25.5
62.4	43.1	71.6	45	24.3
62	42.1	71	44	23.1
61.5	41.6	70.5	43.2	22
61	40.9	69.9	42.3	20.7
60.5	40.1	69.4	41.5	19.6