1、I M IL-PRF- I 8949B(O S) 26 Mav 1999 SUPERSEDING 5 January 1976 MIL-PRF- 18949A(OS) PERFORMANCE SPECIFICATION PROJECTILES, ILLUMEVATING, LOCALIZED HEAT TREATMENT OF ?iis specification is approved for lise by rhe Naval Sea System Cornniand. Depnmient of the Navy, mid is available for use by all Depar
2、rnretits arid Agencies of rhe Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the localized heat treatment requirements of an inner annulus of the body under the band seat on illuminating projectiles, and supplements the requirements of the projectile specification. 2. APPLICABL
3、E DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specificatian or recommended for additional information or as examples. While every effort has been made to e
4、nsure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. I INCH-POUND I 2.2.1 Specifications. The following specification forms
5、 a part of this document to the extent specified herein. Unless otherwise specified, the issue of this document is that listed in the issue of the Deparunent of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). MIL-PRF- I8950 Projecti
6、les, High-Capacity, Anti-Aircraft, and Illuminating Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use ia improving this document should be addressed to: Commander, Indian Head Division, Naval Surface Warfare Center, Standardization Team (Code MOM)
7、, 101 Strauss Avenue, Indian Head, MD 20640-5035, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by sending a letter. AMSC N/A FSC 1320 DISTFUBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IH
8、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.3 Non-Government publications. The following document forms a part of this document to the c,yte.?l specified herei.?. !J!?!,ss g!erwIse specified, the Issues ef tee dorumens which are Ed! adopu! are those listed i
9、n 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 cired in the solicitation (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)/AMERICAN SOCIETY FOR QUALITY CONTROL (ASQC) ANSUASQC Z1.
10、4 Sampling Procedures and Tables for Inspection by Attributes (DoD adopted) (DoD activities may obtain copies of ANWASQC 21.4 from the Standardization Documents Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 11-5094. The private sector and other Government agencies may purchase co
11、pies from the American Society for Quality Control, 6 1 1 East Wisconsin Avenue, Milwaukee, WI 53202-4606 .) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, ho
12、wever, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 General. In addition to those requirements set forth herein and in MIL-PRF-18950, illuminating projectiles shall, at the time of localized heat treatment, be in that stage of manufacn
13、ire where the rotating bands have been assembled to the body of the projectile but prior to the finish -l-:-:- .-.C.L- c- -=:-i ._ _._ :- J- * il-:- 1-1:-.4 L-r .d-*-*-* IIIBEIIIIIIIlg U1 UIUX SUI LdLCh bUUJCL1 lu WkIpiilg UUC lu U113 lULiiILCU ilCd1 IlCiUIICIIL. 3.2 First Article. When specified (s
14、ee 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.3 Material. Materials shall comply with the requirements specified herein and the specifications referred to on the applicable drawings or list of drawings, unless specific approval, in writing, covering a dep
15、arture therefrom has been obtained from the contracting activity prior to manufacture or use. 3.4 Chemical composition. Illilmiating projectiles purchased under this specification shall be restricted to the analysis shown in table 1. Upon written request by the contractor, ocher compositions may be
16、approved by the contracting activity. 3.5 Physical Properties. The inner annulus shall be heat treated so that its minimum cross section is in accordance with rabie II for the applicable caliber and mark. That portion of the cavity between D and E (see figure 1) shall be heat treated to a minimum ha
17、rdness of Rockweli C52 for a total minimum depth of C minus F. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF- 18949B(OS) Eiement Carbon I TABLE I. clieniicul coniposirion. Percent 0.45 - 0.55 Manganese Phosphorous 1.35 - 1.60 0.05, rnax.
18、Sulfur 0.05, max. 0.25, rnax. Nickel Chromium 0.25, max. 0.15, max. Molybdenum TABLE 11. Limiting dirieiisiorts (iriciies) of Iiardemd areas. O. 10, max. Caliber 5 “138 5 “154 Letters are as defined in figure 1. MK A B C D E F 44 0.500-0.725 5.00 - OOOO 0.125 -0.140 1.30 4.50 0.025 48 0.800- 1.000 5
19、.40 - 0.000 0.125 -0.140 1.30 I 5.10 0.025 + 0.500 -t- 0.500 3 D Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF- 18949B(OS) i HARDENED C F AREA A B C Total hardened depth. D E F Distance from base to beginning of hardened area. Distance from
20、 base to end of hardened area. Maximum distance from base to beginning of hardened area having hardened depth C. Minimum distance from base to end of hardened area having hardened depth C. Maximum width of transition area. FIGURE 1. Location of hardened pattern. 3.6 Workmanship. All workmanship shal
21、l be high grade, suitable for the purpose intended and uniform for all projectiles in each lot. Projectile bodies shall be free from all surface conditions that interfere with satisfactory heat treatment. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
22、-,-,-MIL-PRF- 18949B(OS) 4. VERIFICATION 4.1 Classifkation of inspections. The inspection requirements specified herein are classified as follows : a. b . First article inspection (see 4.2) Quality conformance inspection (see 4.3). 4.2 First article inspection. Projectiles in the first article lot s
23、hall be subjected to all tests considered necessary by the contracting activity (see 6.2) to determine conformance to the requirements of this specification. The results of these tests will determine whether the supplier shall proceed under the contract. 4.3 Quality conformance inspection. 4.3.1 Sam
24、pling. Unless otherwise specified, and when applicable, the sampling plans and procedures used in the determination of the acceptability of products submitted by a supplier for Government inspection shall be in accordance with ANSUASQC Z1.4. 4.3.1.1 Inspection lot. As applied to the Government inspe
25、ction of units of product, the term “lot“ shall mean “inspection lot,“ i.e., a collection of units of the product used as a basis for Government inspection. Unless otherwise specified (see 6.2), the number of units of product in inspection lots shall be as determined by the contracting activity and
26、may differ from the quantity designated in the contract or order as a lot for production, shipment, or other purposes. 4.3.2 Examination of packaging. The preservation, packing, and marking of the projectiles shall be examined for conformance to the requirements of section 5. 4.3.3 Physical properti
27、es test. Every second projectile shall, after localized heat treatment, be tested in a Rockwell testing device to determine that the hardness meets the minimum requirements of 3.5. In addition, one projectile from each lot shall be sectioned through the locally hardened area and parallel to its long
28、itudinal axis. Hardness check readings shall be taken on such sectioned projectiles as required by the contracting activity (see 6.2). Each sectioned projectile shall then be suitably etched to bring out the hardened pattern. The pattern shall be examined for conformance to the requirements of 3.5.
29、5. PACKAGING 5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD personnel, these personnel need to contact the responsible packaging activity to ascertain requisite
30、packaging requirements. Packaging requirements are maintained by the Inventory Control Points packaging activity within the Military Department or Defense Agency, or within the Military Departments System Command. Packaging data retrieval is available from the managing Military Departments or Defens
31、e Agencys automated packaging files, CD-ROM products, or by contacting the responsible 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF- 18949B(OS) packaging activity. 6. NOTES (This section contains information of a general or explanatory n
32、ature which may be helpful, but is not mandatory.) 6.1 Intended use. These projectiles are military unique because they are used to provide illumination, screening, and electromagnetic interference on a battlefield. They have no commercial application. 6.2 Acquisition requirements. Acquisition docum
33、ents must specify the following: a. Title, number, and date of this specification. b. Issue of DoDISS to be cited in the solicitation, and if required, the specific issue of individual documents referenced (see 2.2 and 2.3). c. Whether first article inspection is required and the specific sampling a
34、nd tests to be performed (see 3.2 and 4.2). d. Lot size, if other than specified by the contracting activity (see 4.3.1.1). e. Hardness checks required on the sectioned projectiles (see 4.3.3). f. Packaging requirements (see 5.1). 6.3 Subject term (key word) listing. Chemical composition Hardened pa
35、ttern Physical properties 6.4 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. Preparing activity : (Project 1320-002 1) Navy - OS 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
