HAI Advanced Material Specialists

APPROXIMATE, EQUIVALENT HARDNESS NUMBERS FOR DIAMOND PYRAMID HARDNESS (Vickers, DPH) FOR STEEL (a)
Diamond Pyramid Hardness No.	Brinell Hardness No.10 mm Ball, 3000 kg Load			Rockwell Hardness No.				Rockwell Superficial Hardness No., Superficial Brale Penetrator			Shore Scleroscope Hardness No.	Tensil Strength (approx), 1000 PSI
Diamond Pyramid Hardness No.	Standard Ball	Hultgreen Ball	Tungsten Carbide Ball	A-scale, 60 kg load, brale penetration	B-scale, 100 kg load, 1/16" diam ball	C-scale 150 kg load, brale penetration	D-scale 100 kg load, brale penetration	15-N scale, 15 kg load	30-N scale, 30 kg load	45-N scale, 45 kg load	Shore Scleroscope Hardness No.	Tensil Strength (approx), 1000 PSI
940	...	...	...	85.6	...	68,0	76.9	93.2	84.4	75.4	97	...
920	...	...	...	85.3	...	67.5	76.5	93.0	84.0	74.8	96	...
900	...	...	...	85.0	...	67.0	76.1	92.9	83.6	74.2	95	...
880	...	...	767	84.7	...	66.4	75.7	92.7	83.1	73.6	93	...
860	...	...	757	84.4	...	65.9	75.3	92.5	82.7	13.1	92	...
840	...	...	745	84.1	...	65.3	74.8	92.3	82.2	72.2	91	...
820	...	...	733	83.8	...	64.7	74.3	92.1	81.7	71.8	90	...
800	...	...	722	83.4	...	64.0	73.8	91.8	81.1	71.0	88	...
780	...	...	710	83.0	...	63.3	73.3	91.5	80.4	70.2	87	...
760	...	...	698	82.6	...	62.5	72.6	91.2	79.7	69.4	86	...
740	...	....	684	82.2	...	61.8	72.1	91.0	79.1	68.6	84	...
720	...	...	670	81.8	...	61.0	71.5	90.7	78.4	67.7	83	...
700	...	615	656	81.3	...	60.1	70.8	90.3	77.6	66.7	81	...
690	...	610	647	81.1	...	59.7	70.5	90.1	77.2	66.2	...	...
680	...	603	638	80.8	...	59.2	70.1	89.8	76.8	65.7	80	329
670	...	597	630	80.6	...	58.8	69.8	89.7	76.4	65.3	...	324
660	...	590	620	80.3	...	58.3	69.4	89.5	75.9	64.7	79	319
650	...	585	611	80.0	...	57.8	69.0	89.2	75.5	64.1	...	314
640	...	578	601	79.8	...	57.3	68.7	89.0	75.1	63.5	77	309
630	...	571	591	79.5	...	56.8	68.3	88.8	74.6	63.0	...	304
620	...	564	582	79.2	...	56.3	67.9	88.5	74.2	62.4	75	299
610	...	557	573	78.9	...	55.7	67.5	88.2	73.6	61.7	...	294
600	...	550	564	78.6	...	55.2	67.0	88.0	73.2	61.2	74	289
590	...	542	554	78.4	...	54.7	66.7	87.8	72.7	60.5	...	284
580	...	535	545	78.0	...	54.1	66.2	87.5	72.1	59.9	72	279
570	...	527	535	77.8	...	53.6	65.8	87.2	71.7	59.3	...	274
560	...	519	525	77.4	...	53.0	65.4	86.9	71.2	58.6	71	269
550	505	512	517	77.0	...	52.3	64.8	86.6	70.5	57.8	...	264
540	496	503	507	76.7	...	51.7	64.4	86.3	70.0	57.0	69	260
530	488	495	497	76.4	...	51.1	63.9	86.0	69.5	56.2	...	254
520	480	487	488	76.1	...	50.5	63.5	85.7	69.0	55.6	67	250
510	473	479	479	75.7	...	49.8	62.9	85.4	68.3	54.7	...	244
500	465	471	471	75.3	...	49.1	62.2	85.0	67.7	53.9	66	240
490	456	460	460	74.9	....	48.4	61.6	84.7	67.1	53.1	...	234
480	448	452	452	74.5	...	47.7	61.3	84.3	66.4	52.2	64	230
470	441	442	442	74.1	...	46.9	60.7	83.9	65.7	51.3	...	224
460	433	433	433	73.6	...	46.1	60.1	83.6	64.9	50.4	62	220
450	425	425	425	73.3	...	45.3	59.4	83.2	64.3	49.4	...	214
440	415	415	415	72.8	...	44.5	58.8	82.8	63.5	48.4	59	210
430	405	405	405	72.3	...	43.6	58.2	82.3	62.7	47.4	...	204
420	397	397	397	71.8	...	42.7	57.5	81.8	61.9	46.4	57	200
410	388	388	388	71.4	...	41.8	56.8	81.4	61.1	45.3	...	195
400	379	379	379	70.8	...	40.8	56.0	81.0	60.2	44.1	55	190
390	369	369	369	70.3	...	39.8	55.2.	80.3	59.3	42.9	...	185
380	360	360	360	69.8	(110.0)	38.8	54.4	79.8	58.4	41.7	52	180
370	350	350	350	69.2	...	37.7	53.6	79.2	57.4	40.4	...	175
360	341	341	341	68.7	(109.0)	36.6	52.8	78.6	56.4	39.1	50	170
350	331	331	331	68.1	...	35.5	51.9	78.0	55.4	37.8	...	166
340	322	322	322	67.6	(108.0)	34.4	51.1	77.4	54.4	36.5	47	161
330	313	313	313	67.0	...	33.3	50.2	76.8	53.6	35.2	...	156
320	303	303	303	66.4	(107.0)	32.2	49.4	76.2	52.3	33.9	45	151
310	294	294	294	65.8	...	31.0	48.4	75.6	51.3	32.5	...	146
300	284	284	284	65.2	(105.5)	29.8	47.5	74.9	50.2	31.1	42	141
295	280	280	280	64.8	...	29.2	47.1	74.6	49.7	30.4	...	139
290	275	275	275	64.5	(104.5)	28.5	46.5	74.2	49.0	29.5	41	136
285	270	270	270	64.2	...	27.8	46.0	73.8	48.4	28.7	...	134
280	265	265	265	63.8	(103.5)	27.1	45.3	73.4	47.8	27.9	40	131
275	261	261	261	63.5	...	26.4	44.9	73.0	47.2	27.1	...	129
270	256	256	256	63.1	(102.0)	25.6	44.3	72.6	46.4	26.2	38	126
265	252	252	252	62.7	...	24.8	43.7	72.1	45.7	25.2	...	124
260	247	247	247	62.4	(101.0)	24.0	43.1	71.6	45.0	24.3	37	121
255	243	243	243	62.0	...	23.1	42.2	71.1	44.2	23.2	...	119
250	238	238	238	61.6	99.5	22.2	41.7	70.6	43.4	22.2	36	116
245	233	233	233	61.2	...	21.3	41.1	70.1	42.5	21.1	...	114
240	228	228	228	60.7	98.1	20.3	40.3	69.6	41.7	19.9	34	111
230	219	219	219	...	96.7	(18.0)	...	...	...	...	33	106
220	209	209	209	...	95.0	(15.7)	...	...	...	...	32	101
210	200	200	200	...	93.4	(13.4)	...	...	...	....	30	97
200	190	190	190	...	91.5	(11.0)	...	...	...	...	29	92
190	181	181	181	...	89.5	( 8.5)	...	...	...	...	28	88
180	171	171	171	...	87.1	( 6.0)	...	...	...	...	26	84
170	162	162	162	...	85.0	( 3.0)	...	...	...	...	25	79
160	152	152	152	...	81.7	( 0.0)	...	...	...	...	24	75
150	143	143	143	...	78.7	...	...	...	...	...	22	71
140	133	133	133	...	75.0	...	...	...	...	...	21	66
130	124	124	124	...	71.2	...	...	...	...	...	20	62
120	114	114	114	...	66.7	...	...	...	...	...	...	57
110	105	105	105	...	62.3	...	...	...	...	...	...	...
100	95	95	95	...	56.2	...	...	...	...	...	...	...
95	90	90	90	...	52.0	...	...	...	...	...	...	...
90	86	86	86	...	48.0	...	...	...	...	...	...	90
85	81	81	81	...	41.0	...	...	...	...	...	...	85