MIL-T-85048
4.3.3 Sampling plan A for chemical tests. A sample consisting of not less than 2 ounces of material (see 3.1) shall be selected and prepared in accordance with method 111 of
112 of FED-STD-151.
4.3.3.1 Waiver of samples for check chemical analysis. Samples for check chemical analysis may be waived, provided all of the material under inspection can be identified as being made from a heat previously analyzed and found to conform to the chemical composition specified herein.
4.3.3.2 Analysis. Analysis shall be by method lll or ll2 of FED-STD-l5l. In the event of dispute, analysis shall be by method lll.
4.3.4 Sampling plan B for grain size. One specimen shall be selected to represent each lot of tubing.
4.3.4.1 Average grain size. Specimens shall be prepared and tested in accordance with method 311 of FED-STD-l51. In the event of doubt concerning grain size as
determined by comparison with the grain size chart of method 311, the Heyn Intercept method of ASTM E 112 shall be used. The average grain size shall be the average of five fields of view on each specimen.
4.3.5 Sampling plan C for mechanical properties. Two samples shall be selected to represent each 2000 feet of tubing of each lot up to 5000 feet, and two additional samples from each additional 5000 feet of the lot.
4.3.5.1 Full-tube specimens. Samples shall be tested as full-tube specimens with a test section of not less than 6 inches between plugs, as required by figure 1, method 211 of FED-STD-151, entitled, "Metal Plugs Used for Testing Tubing, Location of Plugs in Tubular Specimen, and Proper Location of Specimens in Heads of Testing Machine." In larger diameters of tubing, type T1 or T2 specimens may be used. Tests shall comply with the applicable requirements of method 211 of FED-STD-151.
4.3.6 Sampling plan D for flaring test. One end of each tube or specimen cut therefrom shall be flared by spinning or by forcing axially over a tapered pin, except that not less than 13 samples from each lot, or one from each tube comprising lots of less than 13, shall be tested by the latter method. For flare test without spinning, the specimen shall be 1 inch or 1.5 diameters in length.
4.3.6.1 Flaring the ends of each specimen. The end of each specimen to be flared without spinning shall be cut square, with the cut end smooth and free from burrs but the corners not rounded. The specimen shall at room temperature, be forced axially by steady pressure over a hardened and polished tapered steel pin to produce the tubing flare configuration specified by MS33584. Both the tube and pin shall be clean and dry during the flaring operation. Surfaces of flares shall be examined at magnification of 3 diameters for freedom from cracks and other defects.
4.3.6.2 Removal of flare. Removal of the flare portion after inspection and prior to shipping is optional, unless otherwise specified.
4.3.7 Sampling plan E for flattening test. Specimens 1 inch or more in length shall be cut from sample tubing selected in accordance with table V
.
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