Approximate Hardness Conversion Numbers for Non-Austenitic Steels

Approximate Hardness Conversion Numbers for Non-Austenitic Steels
Vicker’s Hardness Number (HV)	Rockwell Hardness Number C Scale, 150 Kgf (HRC)	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)	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)	Newtons N / mm2
940	68			920	85.6	76.9	93.2	84.4
900	67			895	85	76.1	92.9	83.6
865	66			870	84.5	75.4	92.5	82.8
832	65			846	83.9	74.5	92.2	81.9
800	64			822	83.4	73.8	91.8	81.1
772	63			799	82.8	73	91.4	80.1
746	62			776	82.3	72.2	91.1	79.3
720	61			754	81.8	71.5	90.7	78.4
697	60			732	81.2	70.7	90.2	77.5
674	59		634	710	80.7	69.9	89.8	76.6	2033
653	58		615	690	80.1	69.2	89.3	75.7
633	57		595	670	79.6	68.5	88.9	74.8	1956
613	56		577	650	79	67.7	88.3	73.9	1879
595	55		560	630	78.5	66.9	87.9	73
577	54		543	612	78	66.1	87.4	72	1802
560	53		525	594	77.4	65.4	86.9	71.2
544	52		512	576	76.8	64.6	86.4	70.2	1725
528	51		496	558	76.3	63.8	85.9	69.4
513	50		481	542	75.9	63.1	85.5	68.5	1663
498	49		469	526	75.2	62.1	85	67.6	1617
484	48	451	455	510	74.7	61.4	84.5	66.7	1555
471	47	442	443	495	74.1	60.8	83.9	65.8	1509
458	46	432	432	480	73.6	60	83.5	64.8
446	45	421	421	466	73.1	59.2	83	64	1463
434	44	409	409	452	72.5	58.5	82.5	63.1	1417
423	43	400	400	438	72	57.7	82	62.2	1400
412	42	390	390	426	71.5	56.9	81.5	61.3	1355
402	41	381	381	414	70.9	56.2	80.9	60.4	1309
392	40	371	371	402	70.4	55.4	80.4	59.5	1263
382	39	362	362	391	69.9	54.6	79.9	58.6	1232
372	38	353	353	380	69.4	53.8	79.4	57.7	1200
363	37	344	344	370	68.9	53.1	78.8	56.8	1186
354	36	336	336	360	68.4	52.3	78.3	55.9	1155
345	35	327	327	351	67.9	51.5	77.7	55
336	34	319	319	342	67.4	50.8	77.2	54.2	1124
327	33	311	311	334	66.8	50	76.6	53.3	1093
318	32	301	301	326	66.3	49.2	76.1	52.1	1047
310	31	294	294	318	65.8	48.4	75.6	51.3	1016
302	30	286	286	311	65.3	47.7	75	50.4	986
294	29	279	279	304	64.8	47	74.5	49.5	970
286	28	271	271	297	64.3	46.1	73.9	48.6
279	27	264	264	290	63.8	45.2	73.3	47.7	939
272	26	258	258	284	63.3	44.6	72.8	46.8	909
266	25	253	253	278	62.8	43.8	72.2	45.9	893
260	24	247	247	272	62.4	43.1	71.6	45	862
254	23	243	243	266	62	42.1	71	44
248	22	237	237	261	61.5	41.6	70.5	43.2	847
243	21	231	231	256	61	40.9	69.9	42.3	816
238	20	226	226	251	60.5	40.1	69.4	41.5	785