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Fatigue Strength PSI - Hard and Aged

Fatigue Strength PSI - Hard and Aged

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Thickness:
Suggested Scale:
If you would like to convert between scales, please enter the hardness value determined on your N15Scale and press "convert".

CScale	A	N15Scale	N30Scale	N45Scale	Brinall3000	Tensile

CScale	A	N15Scale	N30Scale	N45Scale	Brinall3000	Tensile
20	60.5	69.5	41.5	19.5	230	108
22	61.5	70.5	43	22	240	112
24	62.5	71.5	45	24	250	117
26	63.5	72.5	47	26.5	260	123
28	64.5	74	48.5	29	270	129
30	65.5	75	50.5	31.5	283	136
32	66.5	76	52	33.5	297	144
34	67.5	77	54	36	313	153
36	68.5	78.5	56	38.5	332	162
38	69.5	79.5	57.5	41	352	171
40	70.5	80.5	59.5	43	372	182
42	71.5	81.5	61.5	45.5	393	194
44	72.5	82.5	63	48	415	205
45	73	83	64	49	426	211
46	73.5	83.5	65	50	437	217
47	74	84	66	51.5	448	223
48	74.5	84.5	66.5	52.5	460	230
49	75.5	85	67.5	54	472	236
50	76	85.5	68.5	55	484	243
51	76.5	86	69.5	56	496	250
52	77	86.5	70.5	57.5	509	256
53	77.5	87	71	58.5	522	263
54	78	87.5	72	59.5	534	270
55	78.5	88	73	61	547	277
56	79	88.5	74	62	560	284
57	79.5	89	75	63	573	291
58	80	0	75.5	64	587	299
59	80.5	89.5	76.5	65.5	600	306
60	81	90	77.5	66.5	614	314
61	81.5	90.5	78.5	67.5	0	0
62	82.5	91	79	69	0	0
63	83	91.5	80	70	0	0
64	83.5	0	81	71	0	0
65	84	92	82	72	0	0
66	84.5	92.5	83	73	0	0
67	85	93	83.5	74.5	0	0
68	85.5	0	84.5	75.5	0	0
69	86	93.5	85	76.5	0	0
70	86.5	94	86	77.5	0	0

BScale	T15Scale	T30Scale	T45Scale	Brinell500	Tensile
0	61	15	0	53	0
4	62	18	0	55	0
8	63.5	20.5	0	56	0
12	64.5	23.5	0	58	0
16	66	26	0	60	0
20	67	29	0	62	0
24	68.5	32	0	64	0
28	69.5	34.5	0	66	0
30	70.5	36	2	67	0
32	71	37.5	4	68	0
34	71.5	38.5	6	70	0
36	72	40	8	71	0
38	73	41.5	10	73	0
40	73.5	43	12.5	74	0
42	74	44	14.5	76	0
44	75	45.5	16.5	78	0
46	75.5	47	18.5	79	0
48	76	48.5	20.5	81	0
50	77	49.5	23	83	0
52	77.5	51	25	85	0
54	78	52.5	27	87	0
56	79	54	29	90	0
58	79.5	55	31	92	0
60	80	56.5	33.5	95	0
62	80.5	58	35.5	98	0
64	81.5	59.5	37.5	101	0
66	82	60.5	39.5	104	0
68	83	62	41.5	107	0
70	83.5	63.5	43.5	110	0
72	84	65	45.5	114	0
74	0	66	47.5	118	0
75	85	67	48.5	120	0
76	0	67.5	49	122	0
77	85.5	68	50	124	0
78	86	69	51	126	0
79	0	69.5	52	128	0
80	86.5	70	53	130	72
81	87	71	54	133	74
82	0	71.5	55	135	75
83	87.5	72	56	137	77
84	88	73	57	140	78
85	0	73.5	58	142	80
86	88.5	74	58.5	145	81
87	89	74.5	59.5	148	83
88	0	75	60.5	151	85
89	89.5	75.5	61.5	154	87
90	90	76	62.5	157	89
91	0	77	63.5	160	91
92	90.5	77.5	64.5	163	93
93	91	78	65.5	167	96
94	0	78.5	66	171	98
95	91.5	79	67	175	101
96	0	80	68	179	103
97	92	80.5	69	184	106
98	0	81	70	189	109
99	92.5	81.5	71	195	112
100	93	82	72	201	116

Suggested Scale: 15N-Scale - 15Kg N "Brale"
Instructions:15N-Scale. Use the Superficial Rockwell Hardness Tester with a 15 kg. load, the diamond point N-Brale penetrator and the steel anvil.

Some Do's and Don'ts
Based on our experience

NOTE - We believe in the use of Rockwell Hardness Testers in determining hardness values for the above flat cold rolled products, (in fact we have 7 of them in daily use). But, remember that these values are approximate and vary somewhat from one tester to another and from person to person.

We do not recommend the attempt to substitute B-scale Testers for Superficial Testers or vice versa.
We suggest frequent use of test blocks for accuracy (use good side of blocks only). Change steel balls often and record changes.
Never use a diamond point penetrator and a diamond anvil together.
Keep tester clean-in a warm dry room-frequently oil elevator screw with proper oil.
Avoid locating tester where subject to noticeable floor vibration.
Be gentle in tripping lever-let the machine do the work. This is an instrument, not a production machine.
Use care in selecting samples. They should be quite flat and free from distortion resulting from careless hand shearing.
Samples should never be bent by hand or otherwise prior to testing. This results in inaccuracies.
Inspect steel anvils for penetration damage at each using. Inspect diamond point penetrator and diamond anvil at each using.
Values resulting from double or multiple thickness testing are approximate only.

Notes

Even for steel, Tensile Strength relation to hardness is inexact, unless determined for specific material.
The 15N, 30N, 45N, and the 15T, 30T and 45T scales pertain to our "ROCKWELL" Superficial Hardness Testers which apply exceedingly light minor and major loads for very shallow indentations, as required for testing nitrided steel or thin sheet metal.
All relative values on this card are averages of tests on various metals whose differences in coldworking and other properties prevent establishment of exact mathematical conversion. Hardness values here given were carefully determined in our own Standard Laboratory."
Because conversions are not altogether reliable, the actual work of checking should be done on similar and identical testing machines - and to the same scale without conversions. The following listings, because of space limitations are confined to those products and tempers regularly stocked by us at PRECISION STEEL. As other metals and alloys are added, this list will be amended accordingly.
Not all technicians would agree with our testing procedures, viz., with the scales prescribed for different conditions. However, these are the standards we have set up for ourselves and so used by us.
Of greatest importance however, is IDENTICAL MACHINES - Coupled with IDENTICAL SCALES

Fatigue Strength PSI - Hard and Aged

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