1、- MIL-C-50732 13 W 9999906 0330354 5 W MIt-c-50712( Mu) 19. February 1971 1. SCOPE 1.1 This specification covers Case, Cartridge, 57m, 303. 2. APmcAl3DocuMENTs 2.1 The following documents of the issue in effect on date of invl- tation for bids or request for proposal, form a part of this specificati
2、on to the extent specified herein. SPECDICATIONS Military MU;-A-2550 - Ammiinition and Special Weapons, General Specification For Federal Federal Test Method Stanard No. i41 - palnt, Varnish, Lacquer Federal Test Method Standard No. l5i - Metals; Test Methods and Related Materials, Method of Inspect
3、ion, sampling and Testing Wlitary MIL-STD-105 MIL-sTD-1og MIL-STD-U MIL-STD-I MIL- STD- u69 MIL-STD-1235 DRAWINGS Munitions Corninand U738308 37548235 IEL Il738308 - sanipling Procedures and Tables for inspection - Quality Assurance Terms and Definitions - Armmition Data Card - Lot Nunhering of Amrm
4、uiition - Packaging, Packing and Marking for Shipment of inert Amunition Components - Single and Multilevel Continuous Sampling Procedures and Tables for inspection by Attributes by Attributes - Case, Cartridge, 57m, morn3 - Cartons, Ammunition for interplant Shipmnt of Steel Cartridge Cases, 37mm t
5、o lxlmm, inclusive - inspection Equipment List for Case, Cartrige 577J% morn3 FSC 1310 - , THIS DOCUMENT CONTAINS /$ PAGES. , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-50712 13 777770b 0330155 7 - MIL-c-50712 (Mu) (Copies of sp.- Protecti
6、ve coating shall be as specified on the applicable drawing and referenced specifications and shall apply to esdlesc of contour configuration. 3.9 Maximum ProfiLe.- Mminum profile of the cartridge case shall comply with the requirements of the applicable rawing. test in the following phases: 3.10 Fun
7、ctional.- The cartridge case shall be subjected to a functional Excess Pressure Phase Cold Tenperature Phase .e to comply with the requirements SW be 4.3.3.6 Protective Coating.- The sample size and acceptance criteria shall be as specified in the applicable specification. with the requirements shal
8、l be cause for tatdslg the corrective action Failure to conq?S prescribed therein. 4,3.3.7 Functional.- The following proving ground tests wiU be perfomEd by the government: 4.3.3.7.1 Initial Production Sample.- The quantities listed in pable will be baYicticaXLy tested in the phases indicated and t
9、he results of the test WllL be evaluated in accordance vith the criteria set forth in Table III. Test Phase -I_ Quantity LOO Excess Pressure Phase cn Cold Temperature Phase Excess, Ekcess Pressure Phase (information only) Recoil bmntum (information only) /“ 50 5 - Defect Characteristic 1. Splits or
10、cracks 2. IEKtraction 3. Primer retention sample - Accept O O O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-50712( MU) 4,3.3./.2 Production - Lot.- The quantities licte in “able LIT will be baZUstica1ly teeted In the phases indicated and th
11、e results of the test wi be evaluated in accordance with the criteria set orth in Table IV. The lot will be considered eligible for retest, using double the number of sqles, provided that after firing, the rejection criteria has not been attained. TABLE III - Test Phase Ekcess Pressure Phase Recoil
12、Momentm (information 00) -_I_ Quantity 40 5 Defect Characteristic L. Splits or cracks 2. Ektraction 3. Primer retention mm IV - First Sample curmilative Sample Accept Reject Accept Reject O 1 Not permitted O 1 Not Srmtted O 2 1 2 4.3.4 Inspection Equipment. - Index of inspection equipment list, LF=L
13、 ii738308 identified the inspection equipnient required to perform the examinations and tests prescribed herein. 4.4 Test Method - and Procedures. - 4.4.1 Hardness.- This test shall be performed on the locations specified by the applicable drawing in accordance with the procedures prescribed for Roc
14、kwell Hardness testing by Federal Test Method Standard NO. 151. 4.4.1.1 Thermal Treatment.- This test shall be perfomd on a hardness comparator of a nondestructive type approved by the Contracting Officer b 4.4.2 Strength of Brazed Joint (Head to tube)- The cartridge cases selected in accordance w3s
15、haii be mounted on an approved test fixture. The pressure shall be applied graduaUy until the required load has been attained. Upon removal from the test fixture, the joint will be visually examined for crack(s) in the brazed area or deformation of the cartridge case in the heat affected zone. 9 Pro
16、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.4.3 Soundnesc of Weld.- Prior to coating, the weld seam on the I- outside surface shall be visually examined for crack(s) or other dis- continuities, for crack( s) or other discontinuities, utilizing a .
17、- The methods and procedures for performing these tests shall be in accordance with the requirements of the applicable specification. . 4.4.5 axirmun Profile age. - The cartridge case, after application of protective coating shall freely enter the government certified maximum profile gage, The gate
18、of the gage shall close without interference With the cartridge case head. 4.4.6 Mouth, Inside Dianeter.- After m&xlmim profile gaging, the mouth of the cartridge case shall be gaged for the minimum length required by the applicable drawing. without hutage to the varnish. The gage shal enter and be
19、withdrawn freely 4.4.7 Functional. 4.4.7.1 lnitial Production Sample. 4.4.7.1.1 Excess Pressure Phase.- The cartridge case will. be assenibled into a complete round in the same manner as required for service firing. The propellant charge will be such as to produce the chamber pressure specified on t
20、he applicable drawing, conitioned at plus 65 degrees Fahrenheit (F) to plus 75 degrees F, and fired in a serviceable weapon for which the round is standard. will be operated in the service mer. The complete round will be temperature The weapon 4.4.7.1.2 - Cold Temperature Phase.- !The cartridge case
21、 will be assembled into a complete round in the same manner as required for service firing. The propellant charge will be adJusted to produce a chamber pressure of 6700 pxmds per square inch (psi) to 7700 psi piezo equivalent Pressure, when temperature conditioned at plus 70 degrees F. be teqerature
22、 conditioned at minus 35 degrees and fired in a serviceable weapon for which the roufid is standard. weapon will be operated iii the service manner. The complete round will F., to ninus 45 degrees F., The 4.4.7.1.3 &cess, Excess Pressure Phase.- The cartrike case will be assenibled into a complete r
23、ound in the same mnner as required for service firiag. chamber pressure permitted by the proving ground. The complete round will be temperature conditioned at plus 65 degrees F., to plus 75 degrees F., and fired in a serviceable weapon for which the round is standard. weapon will be operated in the
24、service manner. - The propellant charge will be such as to produce the maximum The Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-h -_ - - - MIL-C-507L2 13 9779906 0330Lb4 a -B . 4.4.7.1.4 Recoil Momentum Phase*- The cartrige case will be assembled
25、into a complete round in the same manner asrequired for service firing. The propeUant charge will be such as to produce the service velocity and pressure for the complete round. The recoil momentum will be recorded. 4.4.7.2 Production - Lot. 4.4.7.2.1 &cess Pressure - Phase.- The cartrige case will
26、be assembled into a complete round in the same mer as required for service firing. The propellant charge will be such as to produce the chaniber pressure specified on the apglicable drawing. conitioned at plus 65 degrees F., to plus 75 degrees F., and fired in a serviceable weapon for which the roun
27、d is standard. operated in the service manner. ke complete round will be temperature The weapon will be 4.4.7.2.2 Recoil Momentum Phase.- The cartridge case will be assembled into a complete round in the same mer as required for service firing. velocity and pressure for the complete round. be record
28、ed. The propellant charge will be such as to produce the service The recoil momentum will 5. PREPAATION FOR DELIVERY 5.1 Packin& 5.1.1 Level - A - Not applicable 5.1.2 - Level B - Not applicable 5.1.3 Level C - The cartridge case shall be packed in accordance with the reqsts of Drawing Fj54.8235. 5.
29、2 Packaging and Packi .- Packaging, packing and marking shall be in accordance with MIL-CII)-U -+ 9. 5.3 &ta Card.- Data card information shall be as specified in MIL-STD-llK 6. NOTES 6.1 Prior to fabrication of an initial production sample, the contractor upon approval of the Dontracting Officer, m
30、ay make and subkt for evaluation up to 5 process control lots. These process control lots shall consist of not less than 10 nor mre than 25 cartridge cases each. The contractor shsJ1 furnish all informtion pertaining to the manufacture of the lots to the Contracting Officer. All costs for testing th
31、ese process control lots will be borne by the government. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-50712 13 7777706 0330165 T _ MIL-C- 50712 (MU) 6.2 visuai. Examination Qwii ification.- When compliance with the applcicable requirenients
32、 is in doubt as a result of visual exalnination, this characteristic may be measured or gaged to determine acceptability. =traction.- The term Ektraction shall mean that the fired 6.3 cartridge case is loosened and puiled to the rear of the weapon sufficiently .to pernilt removal by hand. mstodian Preparing activity 12 Arnry - MU (FA) Project No. 131O-ASO1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
