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| MIL-T-50777A(OS)
4.2.2.1.1 Ingot analysis. At least one sample shall be taken from each group of ingots of the
same alloy poured simultaneously from the same source of molten metal by the producer and analyzed
to determine conformance to 3.1. Ingots not conforming to the requirements of this specification
shall be rejected. Completed ingot analysis records shall be available to the procuring activity
at the producer's plant.
4.2.2.1.2 Finish product analysis. When compliance with 4.2.2.1.1 cannot be established,
samples shall be selected as follows: From the tube having a nominal weight of less than 1 pound
per linear foot, one sample shall be selected from each lot weighing 1000 pounds or less; from lot
weighing more than 1000 pounds, one additional sample shall be taken for each 1000 pounds or
fraction thereof in excess of the first 1000 pounds. From tube having a nominal weight of 1 pound
or more per linear foot, one sample shall be taken from each lot consisting of 1000 feet or less;
from lot consisting of more than 1000 feet, one additional sample shall be taken from each 1000
feet or fraction thereof in excess of the first 1000 feet. Only one test specimen shall be taken
from any one piece when more than one piece is available. Not more than one analysis shall be
required per piece.
4.2.2.2 For mechanical property tests.
4.2.2.2.1 Tensile tests. From tube having a nominal weight of less than 1 pound per linear
foot, one tension test sample shall be selected from each lot weighing 1000 pounds or less; from
lots weighing more than 1000 pounds, one additional sample shall be taken for each 1000 pounds or
fraction thereof in excess of the first 1000 pounds. From tube having a nominal weight of 1 pound
or more per linear foot, one tension test sample shall be taken from each lot consisting of 1000
feet or less; from lots consisting of more than 1000 feet, one additional sample shall be taken
for each 1000 feet or fraction thereof in excess of the first 1000 feet. Only one tension test
specimen shall be taken from any one piece when more than one piece is available.
4.2.2.2.2 Flattening test. Flattening test samples equal in number to those required by
4.2.2.2.1 shall be taken and tested to determine compliance with 3.2.1.
4.2.2.2.3 Leak test. Each length of round tube shall be leak tested for compliance with 3.2.2.
4.3 Tests.
4.3.1 Chemical analysis. Chemical analysis shall be made by the wet chemical or
spectrochemical method in conformance with method 111 or 112 of FED-STD-151. In case of dispute,
analysis shall be by method 111.
4.3.2 Mechanical property tests. Specimens shall not be required to be tested within 4 days
after completion of the heat treatment. If the manufacturer so elects, samples may be tested prior
to 4 days aging and if they fail to show the specified properties, the tests shall be discarded and
additional tests made after 4 days aging.
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