I.G. MIL-C-15726F_with_Amendment-1_1991-10-08.pdf

MIL-C-15726F 95 • 9999906 0116841 b •

MIL-C-15726F

4.2.5 Sampling for nondestructive inspection. 'When specified (see 6.2), each piece shall be inspected.

4.3 Test procedures. The sample shall be tested as specified in 4.3.1 through 4.3.3.1.

4.3.1 Chemical analysis. The sample selected as specified in 4.2.2 shall be analyzed by the wet chemical or spectrographic method to determine compliance with table I. In the case of dispute, chemical analysis shall be performed in accordance with ASTM E 75 with copper analysis in accordance with ASTM E 478.

4.3.2 Tension tests. The sample selected as specified in 4.2.3 shall be tested in accordance with ASTM E 8 to determine compliance with table II.

4.3.2.1 Yield stren&th. Yield strength shall be determined by 0.5 percent extension under load.

4.3.3 Nondestructive test. Items selected as specified in 4.2.5 shall be inspected in accordance with MIL-STD-271.

4.3.3.1 Ultrasonic inspection. Ultrasonic inspection testing shall be by the longitudinal wave technique.

4.3.3.1.1 Reference notch removal. If reference holes are made in the material to be tested, they shall be so located that their subsequent removal will not impair the suitability of the material for its intended use.

4.3.3.2 Liquid penetrant inspection. Unless otherwise specified (see 6.2), acceptance criteria for liquid penetrant inspection shall be in accordance with

NAVSEA 0900-LP-003-8000.

4.4 Retest, rejection, and resubmittal.

4.4.1 Retests. Retest shall be as specified in 4.4.1.1 through 4.4.1.3.

4.4.1.1 If any test specimen shows defective machining or develops flaws, it may be discarded and a replacement test specimen substituted.

4.4.1.2 If the percentage of elongation of any tension test specimen is less than that specified and any part of the fracture is outside of the middle two thirds of the gauge length or in a punched or scribed mark within the reduced section, a retest shall be allowed.

4.4.1.3 If the results of the test on one of the specimens fails to meet the specified requirements two additional.specimens shall be taken from different sample pieces and tested. The results of the tests on both of these specimens shall meet the specified requirements.

4.4.2 Rejection. 'When any retest specimen does not conform to specifi cation requirements for the characteristic being tested or more than one specimen of the original sample fails to meet the specified requirements for a particular property the lot represented by the specimen shall be rejected.

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4.3 Test Procedures.

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4.3.3 Nondestructive tests. Items selected as specified in 4.2.5 shall be inspected by ultrasonic and liquid penetrant inspections as specified herein.

4.3.3.1 Ultrasonic inspection. Ultrasonic inspection shall be performed in accordance with MIL-STD-271 as modified by the requirements specified herein. Testing shall be done by the longitudinal wave technique as specified herein. Sheet, strip and wire do not require ultrasonic inspection.

4.3.3.1.1 Calibration. The longitudinal wave set shall be calibrated on a flat bottomed reference hole of a diameter as specified in table IV. Holes shall be drilled either into the piece to be tested or into a separate defect free specimen of the same size, shape, material and condition. Holes are to be drilled to mid-section in material up to 1-1/2 inches thick and at least 3/4 inch deep, but no greater than mid-section, in material over 1-1/2 inches thick, and are to be normal to the surface. The ultrasonic test instruction shall be adjusted so that the response from the reference hole shall be not less than 25 percent and not more than 100 percent of screen height.

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