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Page Title:
Table VII. Permissible variations for flatness, inches. |
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|  MIL-A-12560H (MR)
w/INT. AMENDMENT 4
3.2.10.1.1 Depth of imperfections. The depth of rolled-in scale, scale pitting, mechanical gouges,
or snakes shall not exceed 0.015 inch and shall not reduce the steel thickness below the
allowable minimum. Isolated individual pits over 0.015 inch deep but not over 0.03 inch deep
and not within 6 inches of each other and which do not violate the minimum allowable thickness,
as specified in the applicable drawings and fabrication documents, are acceptable.
3.2.10.2 Edge preparation. Thermal cutting shall be permitted after final heat treatment provided
the procedure, which may include grinding after thermal cutting, is such that no cracks develop
on any thermally cut edge whether detected by nondestructive inspection, or as agreed upon in
the contract. The heat affected zone of thermally cut plates (up to and including 1/2 inch in
thickness) shall not exceed 1.2 times the plates thickness from the cut edge. For plates over 1/2
inch thick, the heat affected zone shall not exceed 5/8 inch from the cut edge. In order to have
the heat affected zone exceed these limits approval shall be obtained from the procuring activity.
TABLE VII. Permissible variations for flatness, inches.
Specified
Variations from a flat surface for specified widths, inches
thickness,
Under
48 to
60 to 72
72 to 84
84 to 96
96 to 108
inches
48
60 excl.
excl.
excl.
excl.
excl.
1/4 to 3/8 excl.
3/4
15/16
1-1/8
1-3/4
1-7/8
-
3/8 to 1/2 excl.
1/2
9/16
5/8
3/4
7/8
-
1/2 to 3/4 excl.
1/2
9/16
5/8
3/4
7/8
-
3/4 to 1-1/4 excl.
1/2
9/16
5/8
3/4
7/8
-
1-1/4 to 1-5/8 excl.
3/8
1/2
1/2
5/8
3/4
-
1-5/8 to 3 excl.
3/8
3/8
7/16
1/2
5/8
3/4
3 to 4 excl.
3/8
1/2
1/2
5/8
3/4
3/4
4 to 6 excl.
1/2
5/8
5/8
3/4
7/8
7/8
6 to 8 excl.
9/16
11/16
11/16
13/16
15/16
15/16
8 to 10 excl.
5/8
3/4
3/4
7/8
1
1
10 to12 excl.
11/16
13/16
13/16
15/16
1-1/8
1-1/8
Note: The above variations apply to plates up to 12 feet in length, or to any 12 feet or longer
plates.
3.2.10.3 Edge condition. Plate edge on plates delivered after heat treatment shall be free of
cracks. The supplier shall practice such necessary process controls to prevent this condition.
3.2.10.4 Internal soundness. All plates 1/2 inch and greater in thickness shall be ultrasonically
examined for internal soundness in accordance with 4.6.5. The steel supplier shall institute
process controls such that any edge of any cut part shall comply with the requirements of
3.2.10.4.1.
3.2.10.4.1 Acceptance criteria.
3.2.10.4.1.1 Single linear indications. In any four inches of length a single linear indication shall
not exceed twice the plate thickness.
12
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