Following is an estimate of the relationship between various hardness scales and the tensile strength of standard steels.  It should be considered as a general comparison not applicable to all materials:

Hardness Conversion Table

Brinell Hardness	Rockwell Hardness
Tungsten Carbide Ball 3000 KG	A Scale 60 kg	B Scale 100 kg	C Scale 150 kg	Tensile Stength (approx.)
–	86	–	68	–
–	85	–	68	–
–	85	–	67	–
767	85	–	66	–
757	84	–	66	–
745	84	–	65	–
733	84	–	65	–
722	83	–	64	–
712	83	–	64	–
710	83	–	63	–
698	83	–	62	–
684	82	–	62	–
682	82	–	62	–
670	82	–	61	–
656	81	–	60	–
653	81	–	60	–
647	81	–	60	–
638	81	–	59	329,000
630	81	–	59	324,000
627	80	–	59	323,000
601	80	–	57	309,000
578	79	–	56	297,000
555	78	–	55	285,000
534	78	–	54	274,000
514	77	–	52	263,000
495	76	–	51	253,000
477	76	–	50	243,000
461	75	–	48	235,000
444	74	–	47	225,000
429	73	–	46	217,000
415	73	–	44	210,000
401	72	–	43	202,000
388	71	–	42	195,000
375	71	–	40	188,000
363	70	–	39	182,000
352	69	–	38	176,000
341	69	–	37	170,000
331	68	–	36	166,000
321	68	–	34	160,000
311	67	–	33	155,000
302	66	–	32	150,000
293	66	–	31	145,000
285	65	–	30	141,000
277	65	–	29	137,000
269	64	–	28	133,000
262	64	–	27	129,000
255	63	–	25	126,000
248	62	–	24	122,000
241	62	100	23	118,000
235	61	99	22	115,000
229	61	98	20	111,000
223	–	97	20	–
217	–	96	18	105,000
212	–	96	17	102,000
207	–	95	16	100,000
201	–	94	15	98,000
197	–	93	–	95,000
192	–	92	–	93,000
187	–	91	–	90,000
183	–	90	–	89,000
179	–	89	–	87,000
174	–	88	–	85,000
170	–	87	–	83,000
167	–	86	–	81,000
163	–	85	–	79,000
156	–	83	–	76,000
149	–	81	–	73,000
143	–	79	–	71,000
137	–	76	–	67,000
131	–	74	–	65,000
126	–	72	–	63,000
121	–	70	–	60,000
116	–	68	–	58,000
111	–	66	–	56,000