1、 MIL-A-LIb077C 75 9 777770b OLL7773 O 9 Distribution Unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-46099C AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM A370 ASTM D3951 - Standard Practice for Commercial Packaging AST# E18
2、ASTM E350 ASTM E380 - Metric Practice (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.) - Mechanical Testing of Steel Products - Rockwell Hardness and Rockwell Superficial Hardness of Metallic - Methods
3、 for Chemical Analysis of Carbon Steel, Low Alloy, Materials Silicon Electrical Steel, Ingot Iron and Wrought Iron (Non-Government standards and other publications are normally available from the organizations which prepare or which distribute the documents. These documents also may be available in
4、or through libraries or other informational services. ) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specification shall
5、 take precedence, Nothing in this specification, however, shall supersede contract requirements, drawing notes or applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified in the contract or purchase order (see 6.2), a sample or
6、samples of the armor plate shall be made available to the contracting officer or his authorized representative for approval. The approval of the first article samples authorizes the commencement of shipment but does not relieve the supplier of responsibility for compliance with all applicable provis
7、ions of this specification. The first article samples and test plates shall be manufactured by the process proposed by the manufacturer for use on production armor. plate and conduct ballistic tests to establish conformance or non-conformance of the plates to the ballistic requirements of this speci
8、fication. Unless otherwise specified (see 6.2b) test results will be provided to the procuring activity and the contractor. The ballistic test agency will inspect the armor 3.1.1 First time producer. First time producers wishing to qualify to this specification should follow the instruction of 6.4.
9、3.2 Chemical composition. Unless otherwise specified (see 6.2), the chemical analysis of the armor plate shall be within the composition limits established by the-contractor. Both the producers proposed chemical composition and the actual chemical composition shall be reported on the Armor Test Data
10、 Report provided to the ballistic test facility (see 6.2.2). 3.3 Material and processing. The chemical composition of the steel, the heat treatment and methods of fabrication wil1,be left entirely to the decision of the armor manufacturer. The process of manufacture and the heat treatment shall be s
11、uch as to produce roll-bonded armor that will meet the requirements of this specification. No operation which may alter the Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-6077C 75 = 7777706 0337775 i W MIL-A-46099C a a ballistic characteristic
12、s of the armor shall be employed after the ballistic test plate representing a lot has been selected. The contractor shall declare the range of chemical composition of the steel used and details of the heat treatment and processing procedure for each lot of armor plate. 3.4 Hardness. The hardness of
13、 the armor plate surfaces when tested as specified in 4.7.2.2 shall be as follows: Rockwell C or Brinell* Ha rdne ss Hardness No. Front Plate 58 Min. 64 Max. Rear Plate 48 Min. 54 Max 601 Min. 712 Max. 461 Max. 534 Max. *3000 KG Load - 10 MM Ball Unless otherwise specified the cross-section hardness
14、 shall be determined and shall comply with the purchasers requirements (see 4.7.2.2 and 6.2). 3.5 Decarburization. The manufacturer shall produce with a practice designed to minimize complete and partial decarburization. 3.6 Bonding. The armor plate shall be composed of metallurgically bonded plates
15、. Ultrasonic Evaluation shall be conducted to locate debond areas. Metallographic evaluation shall be conducted on corner samples to evaluate bond effectiveness and on samples of debond areas located by ultrasound. The presence of bond defects shall be reported to the purchaser. When specified (see
16、6.2e) additional testing or examination of bonds shall be conducted as agreed upon by the contractor and purchaser. Rejection of armor plate because of bond defects shall be as agreed upon by the purchaser and supplier (see 6.2e). 3.7 Ballistic requirements. The ballistic requirements of the armor p
17、late shall be in accordance with the appendix of this specification. 3.7.1 Unless otherwise specified in the contractor order, ballistic test plates shall be forwarded to Commander, U.S. Army Aberdeen- Proving Ground, ATTN: STEAP MT-A Aberdeen Proving Ground, MD 6.2h) 21005 for ballistic testing (se
18、e 3.8 Finish. after treatment. Unless otherwise specified (see 6.2) plates shall be descaled 3.9 Edge preparation. Thermal cutting shall be permitted after final heat treatment provided the procedure, which may include grinding after thermal cutting, is such that no cracks develop on any thermally c
19、ut edge. 3.10 Dimensions and tolerances. The dimensions shall be as specified in the contract or order (see 6.2). the contract or order, the following tolerances shall apply: Unless otherwise specified or permitted in Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
20、se from IHS-,-,-MIL-A-46099C Flatness: Thickness: Within 3/4 inch from a straight line 6 feet in length. 2 0.016 inch for plate thicknesses 0.187 to 0.500 inch inclusive and + 0.019 inch for plate thicknesses over 0.500 through O. 700 inch. 3.11 Marking. Each plate shall be marked with the DLA contr
21、act number, the NSN, manufacturers name or trademark, the number of this specification, the plate thickness in inches and the lot number. The marking shall be such as to identify the higher hardness side. Unless otherwise specified (see 6.2) or permitted on the contract or order, impression stamping
22、 shall not be used except for proper heat and hard-soft side identification during the rolling process. surf ace only. If impression stamping is permitted, it shall be made on the softer 3.12 Ballistic test plate information. When specified in the contract or order, armor data shall be prepared in a
23、ccordance with MIL-STD-367, format I (see 6.2.2). 3.13 Workmanship. All plates shall be free from scale blisters, crazing cracks, gouges, laps, pits, roll marks, rolled in refractory, scabs, . scratches, seams, slivers, snakes and other defects of such severity that are detrimental to fabrication or
24、 performance of the armor plate, 4. QUALITY ASSURANCE 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the perfrmance of all inspection requirements as specified hereilq. Except as otherwise specified in the contract o
25、r purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disappnoved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such i
26、nspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection
27、system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling in quality con
28、formance does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material. 4.2 Classification of inspection. The inspection requirements specified herein are classified as follows: a. b. First article inspect
29、ion (see 3.1, 4.4.1 and 4.7.1). Quality conformance inspection (see 4.7.2). 4.3 $J. A lot shall consist of all plate from the same heat, of the same thickness having the same heat treatment, manufactured under the same processing conditions and submitted for inspection in approximately the same time
30、 periods. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-46077C 75 m 9797706 OLL9777 m MIL-A-46099C 4.4 Sampling. 4.4.1 First article sampling. 4.4.1.1 Ballistic test samples. Two samples of armor plate of the thickness to be supplied on the c
31、ontract, shall be submitted for ballistic tests. the last plate fabricated in the initial lot produced. fabricated, the samples shall be taken from opposite ends of the plate. samples shall be 18 inches by 24 inches. One sample shall be taken from the first plate fabricated and one from When only on
32、e plate is The 4.4.1.1.1 The first article test samples shall be forwarded to a Government facility selected by the procuring activity (see 6.2h). 4.4.1.2 Samples for chemical analysis. Two samples for chemical analysis shall be taken from each ballistic test plate. Samples shall be taken from the h
33、ard and softer sides of the armor plate and each shall be identified accordingly. 4.5 Quality conformance inspection sampling. 4.5.1 For chemical analysis. Representative samples shall be taken for chemical analyses from each lot. Samples shall be taken from the hard and the softer sides of the armo
34、r plate and each shall be clearly identified. 4.5.2 For surface hardness. The location and number of samples to be taken from each lot shall be in accordance with applicable drawings or as otherwise specified (see 6.2). 4.5.3 Por microscopic examination. Two samples, each of the full thickness of th
35、e annealed plate and with both top and bottom surfaces preserved shall be taken from each lot. Samples shall be approximately 1 X 3 inches and shall be taken from diagonal corners of an armor plate representative of the rolling operation. is rolled. One sample only will be required from one end when
36、 a single plate 4.5.4 Sampling for ballistic testing. One plate shall be taken from each lot. The plate size shall be 18 inches by 24 inches. 4.6 Examination. 4.6.1 Visual. Each plate in each lot shall be visually examined for compliance with the requirements for workmanship (see 3.13). plates shall
37、 also be examined after testing to assure soundness of bonding. Ballistic test 4.6.2 Dimensional. Each plate in each lot shall be measured for compliance with the requirements for dimensions and tolerances (see 3.10). 4.6.3 Packaging. Prior to shipment, examination shall be made to determine complia
38、nce with the requirements of section 5. 4.7 Tests. 4.7.1 First article and quality conformance ballistic testing. Ballistic test plates shall be tested at a Government facility designated by the . - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
39、-A-46099C procuring activity. Plate thickness as determined by the ballistic test agency shall be used to determine the required protection ballistic limit forthe plate and shall be taken as the average of 4 thickness measurements read to the nearest 0.001 inch with the average reported to the neare
40、st 0.001 inch. At least one measurement will be taken along each edge of the plate at a distance of at least one inch from the edge. 4.7.1.1 Surface hardness test on ballistic plates. Surface hardness of ballistic test plates shall be determined in accordance with 4.7.2.2. 4.7.2 Quality conformance
41、tests. 4.7.2.1 Chemical analysis. Chemical analysis shall be conducted in accordance with ASTM E350, or other approved analytical method. In case of dispute, the analysis as presented in ASTM E350 shall be the basis for acceptance or rejection. 4.7.2.2 Rockwell hardness or Brinell hardness tests. Ha
42、rdness test specimens shall be prepared and tested in accordance with ASTM A370. three hardness tests shall be taken on each surface and the average value determined for each surface of each ballistic plate. At least 4.7.2.3 Microscopic examination. Specimens for microscopic examination shall be sui
43、tably mounted and etched to reveal the microstructure of the cross section perpendicular to the rolling direction. Examination shall be conducted at X100. examined for decarburization and bonding defects (see 3.5 and 3.6). The etched surface of the annealed armor plate shall be 4.8 Rejection and ret
44、ests. 4.8.1 Rejection. Unless otherwise specified (see 6.2) where one or more test specimens fail to meet the requirements of the specification the lot represented by the specimen or specimens shall be subject to the rejection. 4.8.2 Retest. When no sampling plan is provided or approved by the procu
45、ring agency (see 6.2) and where there is evidence that indicates that the specimen was not representative of the lot of material, and when the detail specification does not otherwise specify, at least two specimens shall be selected to replace each test specimen which failed. All specimens so select
46、ed for retest shall meet the requirements of the specification or the lot shall be subject to rejection. 4.8.3 First article ballistic test failure. In the event of a first article ballistic test failure the supplier must submit two new first article test samples as in 4.4.1.1 and both must pass the
47、 ballistic test requirements in order that the first article armor plate be considered ballistically acceptable. 4.9 Reduced testing. At the discretion of the procuring activity, the amount of testing may be reduced provided the results on consecutive lots indicate that a satisfactory uniform produc
48、t meeting the requirements is being produced. approved or established by the procuring activity involved. Reduced testing shall be in accordance with a system previously 6 a a 0 . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Y MIL-A-qb097C 75 W 99
49、9770b 0137997 II W MIL-A-46099C 5. PACKAGING 5.1 Preservation-packaging. Preservation and packaging shall be level A or C as specified (see 6.2). 5.1.1 Level A. When level A is specified, preservation for shipment shall be in accordance with MIL-STD-163. 5.1.2 Level C. Cleaning, drying, preservation, and packaging shall be in accordance with ASTM D3951. 5.2 Packing. Unless otherwise specified in the contract or order, packing shall be level C (see 6.2). 5
