1、MIL-A-33356F VE W 979796 0335867 8 M G_abr70 MIL-A-l1356F(MR) 22 May 1987 SUPERSEDING 5 February 1974 MIL-A-l1356E(MR) O MILITARY SPECIFICATION ARMOR, STEEL, CAST, HOMOGENEOUS, COMBAT-VEHICLE TYPE (1/4 TO 8 INCHES, INCLUSIVE) This specification is approved for use by the U.S. Army Materials use by a
2、ll Departments and Agencies of the,Department of!Defense, 1 Technology Laboratory, Department of the Army, and is available for 1. SCOPE 1.1 Scope. This specification covers two classes of homogeneous cast steel armor, combat-vehicle type vehicles in thicknesses from 1/4 to 8 inches inclusive (see 6
3、.1). 1.2 Classification. 1.2.1 Class-l. Class-1 cast steel armor is heat treated for maximum resistance to penetration and requires ballistic. testing in accordance with Appendix A. No ballistic testing is required for thicknesses less than 5/8 inch. 1.2.2 Class-2. Class-2 cast steel armor is heat t
4、reated for maximum 0 resistance to shock. Class 2 is only applicable in the thickness range from 1/4 to 1-1/4 inches and does not require ballistic testing. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and
5、handbooks form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. 0 AM
6、SC NO, A4109 /AREA MECA/ DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited. .LnoLnc “95U * 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-Ll35hF ME 9779906 OLL5873 3 m MIL-A- 113 5 6F (MR) 3.2.5.1 Permissible varia
7、tions. Unless otherwise specified on the drawing, the thickness tolerance and the weight tolerance shall be in accordance with Steel Castings Handbook (supplement 3) and shall indicate tolerance limits in one direction only. The absence of a tolerance in the other direction does not mean a limitatio
8、n of zero tolerance. The plus tolerance for thickness shall be controlled by the weight limitations, and the minus tolerance for weight shall be automatically controlled by the lmitations on thickness. However, if the official weights have not been established and specified for the casting design, t
9、he weights of any casting should not vary by more than 5% from the average weight computed from at least the first 10 castings shipped for production vehicles (see 6.3). 3.2.6 Radiographic inspection. Radiographic requirements for production castings shall provide the necessary coverage to the exten
10、t specified on the position chart, drawings or contract (see 6.2). Armor casting shall be classified in accordance with MIL-STD-1265. 3.2.6.1 Radiographic requirements. Each casting subjected to radiographic inspection shall be legibly and indelibly marked “RT“ to assure positive identification unti
11、l after final acceptance is made. 3.2.6.2 Alternate method of inspection. When agreed upon between the procuring activity and the producer, ultrasonic inspection may be used in lieu f radiographic inspection ( see 4.6.2.10). 3.2.7 Magnetic particle inspection. When specified on the drawing or in the
12、 contract, (see 6.2) magnetic particle inspection for production castings shall be performed in accordance with 4.6.2.7. 3.2.8 Liquid penetrant inspection. When specified on the drawing or in the contract, (see 6.2) liquid penetrant inspection shall be performed in accordance with MIL-STD-6866. 3.2.
13、9 Workmanship. When visually inspected, the surface of the finished casting shall not exceed the linear discontinuities open to the surface as defined in 3.2.9.1 or 3.2.9.2. 3.2.9.1 Surface texture and surface discontinuities. The degree of acceptable surface roughness and surface discontinuities sh
14、all be established by agreement between the contractor and the procuring activity using ASTM A802 or SP-55 as the acceptance criteria, or any other established visual acceptance criteria. 3.2.9.2 Machined surfaces. Machined surfaces shall be free of rejectable defects. Specific machined acceptance c
15、riteria critical to individual parts shall be addressed on the part number ordering data or part number quality assurance provision (QAR) . 4. QUALITY ASSUHAMCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible f
16、or the performance of all inspection requirements as specified-herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection 7 Provided by IHSNot for ResaleNo reproduction or networking p
17、ermitted without license from IHS-,-,-requirements specified herein, unless disapproved by the Government. The Government reserves the right to perfom any of the inspections set forth in this specification where such inspections are deemed necessary, such as radiographic inspection of welds, to assu
18、re supplies and services conform to prescribed requirements. 4.2 Classification of inspection. The inspection requirements specified herein are classified according to 4.2.1 and 4.2.2. 4.2.1 First article inspection. 4.2.1.1 Class-1, armor. When specified (see 3.1.1, 6.2) Class-1 armor flat cast or
19、machined flat test plates samples, representing the cast steel produced to the requirements of this specification, shall meet the chemical, ballistic (see Appendix A) and mechanical properties when tested in accordance with table IV. Cast simulated weld-repair plates shall be prepared in accordance
20、with Appendix B. Unless otherwise specified (see paragraph 3.1.1, 602, 6,2.3.1), the first article ballistic test shall not be required provided (a) the manufacturer, within 37 months, has produced acceptable plates within the same nominal thickness ranges of table C-1, P. 47, and (b) his production
21、 conditions are the same as for previously accepted plates, Neigher first article nor acceptance ballistic tests will be required for plates ordered to thicknesses of more than 6.25 inches, Acceptance of thicker plates will be based on meeting the other requirements of the specification. 4.2.1,2 Cla
22、ss 2 armor. When specified (see 3.1.2 and 6.2) class 2 armor, cast simulated weld-repair test plates shall be prepared in accordance with Appendix B. The cast simulated weld-repair plates shall represent the cast steel produced and meet chemical and mechanical properties specified in tables I, II an
23、d III when tested in accordance with table IV. 4.2.2 Quality conformance inspection. Quality conformance inspection for acceptance of production castings (see 3.2) shall be performed on the sample castings selected in accordance with 4.4. This inspection shall include the examinations of 4.5 and the
24、 tests of 4.6.2 (see table IV). 4.2.2.1 1st production casting inspection. Unless otherwise specified (see 6.2) , the 1st production casting inspection shall be required. This inspection shall include the exhination of 4.5.1, 4.5.2 and the tests of 4.6.1 (see table IV). Failure of the first producti
25、on casting to pass the examinafion or any of the tests shall be cause for rejection. 4.2.2.2 Mechanical properties tests on Class-1 production castings. On Class-1 first production casting submitted for ballistic evaluation. weighing 2,000 pounds or more and greatei than 3 inches in thickness, one c
26、ore sample, measuring 1-1/4 inch diameter by “T“ long, shall be taken from the location where the thickness of the casting is equal to or greater than the Charpy impact test block thickness, or as agreed upon between the manufacturer and the procuring activity. Thereafter, a core sample shall be tak
27、en from each production casting submitted for ballistic testing (see 4.6.2.9). 4.3 - Lot. Unless otherwise specified (see 6.2) a lot shall consist of all castings of the same melt of steel. 4.4 Lot sampling. I 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
28、m IHS-,-,-NIL-A-LL35bF NE W 7777906 OLL5875 7 m. TABLE IV. Instructions for testing Class-1 and Class-2 armor. Requirement Applicable to Class Class Specification Paragraph Reference . Characteristics 1 2 Requirements No. of tests Teat Method Visual Inspection Workmanship First. Article (a) Foundry
29、qualification X X 3.1.1 4.1 . Appendix C (b) Ist production casting X X 3.1.2 4.1 4.5 4.6 Produc tion castings (ongoing) X X 3.2 4.1 4.5 4.6 Weight apply. Radiography is applicable to the extent specified in B-30.2.7. 5. PACKAGING 5.1 Preservation, packaging, packing, and marking. Preservation, pack
30、aging, packing, and marking shall be in accordance with the packagin sheet for the required level of protection specified (see 6.2). ata 5 . 2 Marking. legibly marked inspection and MIL-STD-129, 6, NOTES Castings (both green and heat treated) shall be indelibly and with symbols that will definitely
31、identify the castings with test reports and with shipping documents in accordance with 6.1 Intended use. combat vehicles, Th The cast armor specified herein is intended for use on .e thickness of the casting is considered to be that which is most representative of the components ballistic surface. 1
32、6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-3335bF RE m 477770b 0335883 b m 6.1.1 Class 1. Class 1 cast armor is intended for use in those areas where maximum toughness and maximum resistance to penetration by armor piercing type of ammun
33、ition is required. 6.1.2 Class 2. Class 2 cast armor is intended for use in those areas where maximum resistance to failure under conditions of high rates of shock loading is required and where resistance to penetration by armor piercing ammunition is of secondary importance. It is for protection ag
34、ainst anti-tank land mines, hand grenades, bursting shell, and other blast-producing weapons. 0 I 6.2 Ordering data. 6.2.1 Acquisition requirements. Acquisition documents should specify the following : Title, number and date of this specification. Class of armor required (see 1.2). If first article
35、is required (see 3.1 and 3.1.3). If qualification of foundry process is not required If testing of the first production casting is not required (see 3.1.4, 4,2.2.1 and 6.2.3). Weight and dimensions of castings (see 3.2.5 & 6.3). Whether patterns are to be furnished by the casting manu- facturer or t
36、he Government, and provisions for final ownership of the patterns. If magnetic particle inspection is required (sec 3.2.7). If liquid penetrant inspection is required (see 3.2.8). If a different lot size is required (see 4.3). If different sampling for examination is required see (4.4.1). If differe
37、nt sampling for acceptance testing is required (see 4.4.2.1, 4.4.2.2, 4.4.3, and 4.4.4). If ballistic testing of production castings is required (see 4.6.2.9). If different rejection and retest- requirements are needed (see 4.7). Requirement for at least two thermocouple holes for each casting selec
38、ted for low-temperature ballistic tests) (see A-40.2.1). Selection of method and applicable method of preservation and packaging and level of packing of referenced specification (see 5.1). (see 3.1.1.1). 6.2.2 Data requirements. When this specification is used in an acquisition and data are required
39、 to be delivered, the data requirements identified below shall be developed as specified by an approved Data Item Description (DD Form 1664) and delivered in accordance with the approved Contract Data Requirements List (CDRL) , incorporated into the contract. When the provisions of DOD FAR Supplemen
40、t, Part 27, Sub-Part 27.410-6 (DD Form 1423) are invoked and the DD Form 1423 is not used, the data specified below shall be delivered by the L contractor in accordance with the contract or purchase order requirements. Deliverable data required by this specification are cited in the following paragr
41、aphs. I l 17 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Paragraph no . Data requirement title Applicable DID no. Option S30 o 1 Qualification Data UDI-H-23384 Welding Procedure B30 . 1 Certification, Welder DI-H-24029 Qualification 3.1.1, 3.1.2,
42、 Armor Material Test DI-IISC-80073 Format I A-40 2 Reports (Copies of data item descriptions related to this specification, and identified in section 6 will be approved and listed as such in DOD 5010,12-L, IUTSDL. Copies of data item descriptions required by the contractors in connection with specif
43、ic acquisition functions should be obtained from the Naval Publications and Forms Center or as directed by the contracting officer, ) 6.2.3 First article. When a first article inspection is required, the item will be tested and should be a first article sample, a first production item (a sample sele
44、cted from the first casting production items) (or it may be a etandard production item from the contractors current inventory as specified in 4.2.2.1). The first article should consist of (one), (two), etc. unit(s). The contracting officer should include specific instructions in acquisition document
45、s regarding arrangements for examinations, test approval of the documents first article. 6.2.3.1 Special first article ballistic test. Special First Article Ballistic Tests are required when the manufacturer changes either the melting procedure or heat treatment or the declared chemistry of the armo
46、r. 6.3 Official weight, The official weight of the casting may be reestablished at any time considered necessary for the improvement of military characteristics (see 7.2.5 and 3.2.5.1). 6.4 Thickness. The symbol “T“ is used to indicate the thickness of plate, or of castings at the section concerned,
47、 and corresponds to that indicated on the drawings as the Charpy-impact-test-block thickness. 6.5. Position chart drawing. A position chart drawing is a drawing that will be supplied by the procuring activity involved, as one of the applicable drawings to a casting. It will show those areas to be ra
48、diographed, the radiographic standards which apply, and the frequency of radiographic testing, 6.6 Ownership of ballistic test plates, First article test plates are the property of the government if they meet the minimum ballistic requirements of the specification. Otherwise, ownership remains with
49、the manufacturer. The manufacturer must make arrangements if return of plates is desired, 6.7 Potential suppliers. Potential suppliers who have not previously mpplied cast armor to this specification and wish to have their material .llistically tested, may do so at their own expense. It is recommended that -uiries for such testing be directed to Commander, U.S. Army Combat Systems Activity, ATTN: STECS-AS-ID, Aberdeen Proving Ground, ND 21005-5059. S Definitions, 18 Prov
