MIL-DTL-15119B(OS)
3.9 Workmanship. The tubing shall have a smooth, clean surface, free from heavy scale or oxide, pipes, burrs,
seams, cracks, tears, grooves, laminations, slivers, pits, and other injurious defects that may affect its suitability for
the purpose intended. Surface imperfections such as handling marks, straightening marks, light mandrel and die
marks, shallow pits, and scale patterns shall not be considered as injurious defects, provided the imperfections are
not deeper than may be removed without reducing the diameter or wall thickness of the tubing below the permissible
tolerance limits. The removal of surface imperfection is not required. Workmanship shall be verified in accordance
with 4.11.
4. VERIFICATION
4.1 Conformance inspection. The examination and testing of tubing shall be classified as conformance
inspection. Inspection sampling requirements for critical, major, and minor characteristics are defined in
MIL-STD-1916. Unless otherwise specified (see 6.2), Inspection Level IV shall be used for all characteristics
defined as major and Inspection Level II for all minor characteristics; critical characteristics shall be addressed in
accordance with MIL-STD-1916. In addition to the sampling requirements stated herein, Verification Level VII
shall be used to verify the 100 percent screening operation of critical characteristics.
4.2 Lot. A lot shall consist of homogenous tubing produced from the same heat and the same heat treatment.
See 6.5 for definitions.
4.3 Classification of characteristics. The characteristics verified by the tests and examinations herein are
classified as critical, major, or minor in accordance with DOD-STD-2101. Tests and examinations that verify
critical characteristics are identified by the symbol (C) and major characteristics by the symbol (M). The number
following the classification symbol indicates the serial number of the test or examination. Tests and examinations
which are not annotated with a classification code are classified minor.
4.4 Chemical composition.
4.4.1 Sampling. At least five samples shall be selected for check chemical analysis to represent the heat in the
lot. Failure of the samples to meet requirements of 3.2 shall be cause for rejection of the lot represented. Check
chemical analysis may be waived provided that all of the material in the lot can be identified as being made from a
heat previously analyzed and found to conform to the chemical composition specified herein.
4.4.2 Method. Specimens shall be prepared in accordance with ASTM E1282 and shall be tested by wet
chemical methods in accordance with ASTM E350.
4.5 Grain size.
4.5.1 Sampling. Grain size shall be determined on a billet before piercing, hot working, or cold drawing. One
or more samples shall be selected from one or more billets used in making the tubing lot and suitable for
determining the grain size. Failure of the sample to meet the requirements of 3.3 shall be cause for rejection of the
lot represented.
4.5.2 Method. Specimens shall be taken one-half way between the center and outside of the billet. The
specimens shall be approximately 1 inch square or round and normalized at 1650 °F. The specimens shall be
prepared and the grain size determined in accordance with ASTM E112.
4.6 Mechanical properties.
4.6.1 Sampling. At least one tensile test sample shall be selected from each 1000 feet or less of each lot for
determination of mechanical properties. Failure of the sample to meet the requirements of 3.4 shall be cause for
rejection of the lot represented.
4.6.2 Method. Specimens shall be prepared and tested in accordance with ASTM E8/E8M.
4.7 Dimensions. Dimensions shall be verified using standard measuring instruments whose calibration is
managed by a calibration system compliant with ANSI/NCSL Z540.3 or a government-approved equivalent.
4.8 Tolerances. The tolerances shall be verified using standard measuring instruments whose calibration is
managed by a calibration system compliant with ANSI/NCSL Z540.3 or a government-approved equivalent.
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