1、MIL-T-50777A 13 = 7777706 0437520 1 M distribution is unlimited. Licensed by Information Handling ServicesMIL-T-50777A 13 7977706 0437523 3 a MIGT-50777A( OS) MILITARY MIGSTD-129 Marking for Shipment and Storage (Unless otherwise indicated, copies of federal and military standards are available from
2、 Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 191 11-5094.) 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted a
3、re those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) E8 Tension Testing of Metallic Mat
4、erials E 215 Standardizing Equipment for Electromagnetic Testing of Seamless Aluminum-Alloy Tube (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.) 23 Order of precedence. In the event of a conflict between t
5、he text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Chemical composition. The chemical composition shall
6、conform to the requirements shown in table I. The contractor shall furnish an analysis of each melt in the lot showing the percentage of each of the elements designated in table I. The procuring activity may waive chemical analysis of the individual melts if it determines the contractors method of c
7、omposition control is acceptable or that material in the lot can be identified as being from lots previously analyzed and found to be in conformance with the chemical composition requirements. - 3.2 Mechanical properties. The mechanical property requirements for the wall thicknesses and diameters sp
8、ecified in table II shall be as follows: tensile strength, minimum = 4, psi; yield strength (0.2 percent offset), minimum = 42,000 psi; extension under load = O.Oo60 inch per inch; and elongation as shown in table II. NOTE: Tensile test samples taken from tubing reheat treated from T3 temper to T42
9、temper and not cold worked before testing shall show a minimum tensile strength of 4,oOO psi and a minimum yield strength of 40,oOO psi. 3.2.1 Flattening. The tubing shall withstand, without cracking, the flattening test of 4.3.3. 2 Licensed by Information Handling ServicesMIL-T-50777A 13 N 7777706
10、0437522 5 W 1L-T-50777A( OS) TABLE I. Chemical commition. Element Percent, minimum Percent, maximum Titanium Magnesium Silicon Chromium Iron Manganese Zinc Others, each Others, total Aluminum Copper - 0.15 4.90 1.80 0.50 o. 10 0.50 0.90 0.25 0.05 0.15 Remainder TABLE II. Elonpation reuuirements. Tem
11、per Wall thickness, inch Elongation, in 2 inches (minimum percent) “3 - Solution heat treated and then cold reworked Dia. 1/2 to 2 inches 0.050 to 0.259 0.260 to 0.500 14 16 Dia. greater than 2 inches to 8 inches 0.050 to 0.259 10 0.260 to 0.500 12 3.2.2 Test for leaks. Each length of round tube sha
12、ll be tested as specified in either 3.2.2.1 or 3.2.2.2 (at the option of the producer), consistent with the size limitations indicated for each method. 3.2.2.1 Pressure. Each length of round tube shall withstand an air pressure of 250 psi applied to the inside of the tube for not less than 5 seconds
13、 while immersed (see 4.3.4.1). 3 Licensed by Information Handling ServicesMIL-T-50777A 13 7777706 0437523 7 MILT-50777A( OS) 3.2.2.2 Electromagnetic (eddy current). Each length of tube having a maximum wall thickness of 0.083 inch shall produce eddy current indications less than those from the 2A ho
14、les of the applicable reference standard of ASTM E 215 or an equivalent secondary standard when tested in accordance with 4.3.4.2. 33 Tolerances. . -? 33.1 Diameter. The tolerance on diameter shall be as shown in table II. TABLE III. Tolerance on diameter. Allowable deviation of diameter at any poin
15、t from specified diameter, inches2 Specified diameter, inches 0.501 - 1.000 - + 0.008 . . 1.001 - 2.000 - + 0.010 2.001 - 3.000 - + 0.012 * When outside diameter, inside diameter, and wall thickness are ali specified, standard tolerances are applicable to any two of these dimensions, but not to all
16、three. When both outside and inside diameter are specified, tolerances applicable to the outside diameter dimension shall apply to both the outside and inside diameter. Not applicable to tube having a wall thickness less than 0.020 inch or less than 2.5 percent of the outside diameter. 33.2 Wall thi
17、ckness. The wall-thickness tolerance (see 6.3.1) for wall thickness of 0.050 to 0.500 inch shall be 10 percent of the wall thickness. The mean wall thickness shall be the average of two measurements taken opposite each other. 333 Straightness. The straightness tolerance for outside diameter of 0.500
18、 inch to 3.000 inches, measured as departure of the tube from the straight edge, shall be 0.010 inch per foot of length. 33.4 Length. The tolerances on length for outside diameter of 0.500 inch to 3.000 inches shall be: + 1/8 inch for lengths up to 12 feet; + 1/4 inch for lengths over 12 feet and up
19、 to 30 feet; + 3/8 inch for lengths over 30 feet and up to 50 feet; and + 1 inch for lengths over 50 feet. 3.4 Marking for identification. Unless otherwise specified, tubing shall be marked in accordance with FED-STD-l4. 4 Licensed by Information Handling ServicesMIL-T-50777A 13 9777706 043752Li 7 -
20、 I t MIL-T-50777A( OS) 3.5 Workmanship. The tbig shall be seamless and uniform in quality. Exterior and interior surfaces shal be clean and smooth. Seams, slivers, laps, laminations, grooves, or inclusions and other defects specified in figures 1 through 12 shall not be permitted. Tube may be suppli
21、ed with a ground finish provided that the depth of grinding is sufficient to remove surface imperfections, so, if later etched, the surface does not show imperfections equal to those shown on figures 1 to 12. If supplied with a ground finish, it shall be at least equal to RMS 100. 4. QUALITY ASSURAN
22、CE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase orde
23、r, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in this specification where such inspections are
24、 deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or qua
25、lity program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of manu
26、facturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. 4.2 Quality conformance inspectian. Quality c
27、onformance inspection shall consist of sufficient spot checks to ensure conformance with the dimensional tolerances specifid. If the procuring activity approves, a system of statistical quality control may be used for dimensional inspection. Each piece of tubing shall be examined to determine confor
28、mance to 3.5. 4.2.1 Inspection lot. An inspection lot shall consist of tubing of the same nominal outside and inside diameter submitted for inspection at one time. 4.2.2 Sampling. 4.2.2.1 For chemical analysis. 4.2.2.1.1 Ingot analysis. At least one sample shall be taken from each group of ingots of
29、 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
30、 the producers plant. 5 Licensed by Information Handling ServicesMIL-T-50777A 13 7777706 OLi37525 O m MLT-50777A( OS) 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 po
31、und per hear foot, one sample shail be selected from each lot weighing loo0 pounds or less; from lot weighing more than loo0 pounds, one additional sample shall be taken for each loo0 pounds or fraction thereof in excess of the first loo0 pounds. From tube having a nominal weight of 1 pound or more
32、per linear foot, one sample shall be taken from each lot consisting of loo0 feet or less; from lot consisting of more than loo0 feet, one additional sample shall be taken from each loo0 feet or fraction therebf in excess of the first 1000 feet. Only one test specimen shall be taken from any one piec
33、e 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 1o
34、oO pounds or less; from lots weighing more than loo0 pounds, one additional sample shall be taken for each loo0 pounds or fraction thereof in excess of the first loo0 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 co
35、nsisting of loo0 feet or less; from lots consisting of more than loo0 fe or a section of not less than % inch in length, with the subtended arc not greater than 1/2 or less than 1/3 the circumference of the original tube, shall be removed from the tube and without further treatment shall be bent aro
36、und a mandrel having a diameter equal to six times the wall thickness of the tube. The bend shall be made with the pin placed on the inside surface of the spimen with the longitudinal axis of the pin and specimen parallel. The bend shall be continued until the specimen encloses at least 180 degrees
37、of the pin. The outside surface of the tubing shall be examined for cracks. 43.4 Leak test. 43.4.1 Pressure test. While the tube is completely immersed in water or other suitable liquid, an air pressure of 250 psi shall be applied to the inside of the tube for not less than 5 seconds. The tube may b
38、e subjected to this test after reduction to size but before the final anneal. Any tube leakage, as indicated by the formation of air bubbles in the liquid, shall be cause for rejection. 43.4.2 Electromagnetic (eddy current). The eddy current test shall be conducted in accordance with ASTM E 215. The
39、 reference standards specified in the appendix of ASTM E 215-shall be used to standardize the equipment and ensure proper functioning. 4.4 Criteria of acceptability. If a test specimen fails to meet any of the tests required by this specification, the lot represented by the sample shall be rejected
40、except when a statistical sampling plan is provided. 4.4.1 Retests. Retests shall be permitted in accordance with FED-STD-151. 5. PACKAGING 5.1 Packing. All material shall be separated by size, shape, and temper when packed for shipment. Unless otherwise specified, material shall be packed in substa
41、ntial commercial containers of the type, size, and kind commonly used for the purpose in such a manner as to ensure acceptance by carrier for transportation at the lowest rate applicable and to afford maximum protection from normal hazards of transportation. 5.2 Marking. Shipping containers shall be
42、 marked with the name of the material, specification number, temper, size of tubing, quantity contained therein, name of manufacturer, name of contractor (if not the same as manufacturer), number of the contract or order, and gross weight. Any additional marking shall be in accordance with MIGSTD-12
43、9. 7 Licensed by Information Handling Services6. NOTES MLT-50777A( OS). (This section contains Iliformation of a general or explanatory nature that may be helpful but is not mandatory). 6.1 Intended use, The tubing is intended for use in propellant actuated devices used by military aircraft personne
44、l in emergency escape systems. 6.2 Acquisition requirements, Acquisition documents must specify the following: a. Title, number, and date of this specification. b. Issue of DODISS to be cited in tke solicitation, and if required, the specific issue of individual documents referenced (see 2.1.1 and 2
45、.2). c. Inside and outside dimensions of the tubing required. d. Pressure test, if required. e. Packing and marking, if other than as specified in section 5. 63 Definition. 63.1 Wall thickness tolerance. Wall thickness tolerance is the difference between the thickness of the wall at any point and th
46、e mean wall thickness. 6.4 Changes from previous issue. Asterisks are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. 6.5 Subject term (key word) listing. Emergency escape systems, aircrew Ejection systems, aircrew 8 Preparing
47、 Activity: Navy - OS (Project 1377-N9Z) Licensed by Information Handling Services1X 3x HGURE 1. UnacceDtable sidewall imperfection. 9 Licensed by Information Handling Serviceslx 3x MIL-T-S0777A( OS) MIL-T-50777A 13 337330b 0439523 8 FIGURE 2. Unacceptable sidewall imnerfection. 10 Licensed by Inform
48、ation Handling Serviceslx / FLGURE 3. Unacceptable sidewall imperfection. Licensed by Information Handling ServicesMIL-T-50777A 13 W 977770b 0939531 b m MIL-T-50777A( OS) 3x FIGURE 4. Unacceptable sidewall imperfection. 12 Licensed by Information Handling ServicesMIL-T-50777A( OS) IX 3x - FIGURE 5.
49、Unacceptable sidewal imperfection. 13 Licensed by Information Handling ServicesMIL-T-50777A 13 7777706 OLt39533 T H 1X 3x MIL-T-50777A( OS) / FIGURE 6. Unacceptable sidewall imperfection. 14 Licensed by Information Handling Serviceslx FIGURE 7, Unacceptable sidewall imperfection 15 Licensed by Information Handling Services MIL-T-50777A 13 7937706 0439535 3 M 1X 3x. MIL-T-S0777A( OS) . A- FIGURE 8. Unacceptable sidewall imperfection. 16 Licensed by Information Handling ServicesMIL-T-50777A( OS) lx 3x FIGURE 9. Unacceptable sidewall imperfection. 17 Licensed by
