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Page Title: Table VI. Minimum Charpy V-notch impact requirements (at -40F 2F)
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MIL-A-12560H (MR)
w/INT. AMENDMENT 4
TABLE VI. Minimum Charpy V-notch impact requirements (at -40F 2F). 1/
Average Brinell
Plate
Minimum impact values (average of
hardness,
thickness,
two or more test specimens), ft-lb
BHN
inches
Specimen Size
Standard
3/4 width  1/2 width
207
4-12 incl.
65
212
4-12 incl.
63
217
4-12 incl.
61
223
4-12 incl.
59
229
4-12 incl.
57
235
4-12 incl.
55
241
4-12 incl.
53
248
4-12 incl.
50
255
4-12 incl.
47
262
4-12 incl.
44
269
4-12 incl.
40
277
4-12 incl.
37
285
4-12 incl.
33
262
1/4 to less than 4
55
269
1/4 to less than 4
51
277
1/4 to less than 4
47
36
24
285
1/4 to less than 4
43
33
22
293
1/4 to less than 4
39
30
20
302
1/4 to less than 4
35
27
18
311
1/4 to less than 4
31
24
16
321
1/4 to less than 4
28
21
14
331
1/4 to less than 4
25
19
13
341
1/4 to less than 4
22
17
11
352
1/4 to less than 4
19
15
10
363
1/4 to less than 4
17
13
9
375
1/4 to less than 4
16
12
8
388
1/4 to less than 4
16
12
8
1/ ASTM E140 shall be used to convert HRC readings to BHN equivalents.
3.2.10 Workmanship.
3.2.10.1 Surface imperfections. The top and bottom surface of each plate shall be free from the
following surface defects: slivers, laps, checks, seams, blisters, snakes, cold shuts, cracks,
burning, and laminations (see 6.4). The surface of each plate shall be such that mill scale or
oxidation product shall not interfere with determination of acceptability. Imperfections listed
above which are of such nature as to affect the fabrication of the material, are rejectable.
11

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