1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.1 Materials.- Unless otherwise specified, the material from which cups are made shall meet the requirements of Specification JAm-S-45 if the materkal is cold finished strip and the requirements of Spe
2、cification QQ-$433 if the material is cold finished bar, with the following emeptions and additions: Specification m-s-64 - (exceptions) a. b. Steel shall be aluminum killed Steel shall have a ladle malpis within the following ranges (percent): Carbon 0.18 - 0.23 Phosphorus 0.04 ma3c. Manganese 0,30
3、 - 0.bO Sulphur 0.02 mar. I Variation, percent, Over the Maximum Limit or Under the Minimum Limit Specif ied Range, Under Min. 1 Over Fi. 1 1 1 1 Limit, or Maximum of Element percent Limit, % Limit, $ Carbon Manganese Phosphorus Sulphur S i li0 on Copper To 0.25 fml. TO. 0.90 fZXl. Over 0.90 - - TO
4、0.30 inci. Over 0.30 to 0.60 L I I 0.03 ? t 0.01 0.01 0.03 ? 0.06 i 1 ! 0.02 i 0.03 f i o l C. Standard variations in check analysis of finished product over and under the ranges shown for ladie malysis shall be pernitted. Wlicon content in the check analysis shall not exceed .10 percent d. Yfterial
5、?shall be furnished with or without matte finish as Specification QQ4-633 (Additions) specified in the order. a. Steel shall be aluminum killed and comply with FS 1C2C analysis 2 , - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-L2L24 13 9999
6、906 0293980 5 m b. Steel bars shall be furnished in the spheriodized condition and lamellar pearlite shall not be present to an extent which will interfere with C. !Che steel shall have m austenitic grain size of 5 or finer. 3.1.1 Annealed cup. 3.1.1.1 Annealed cups shall be uniformly annealed under
7、 suitable 3.1.1.2 The ennealed cups shall be properly pickled, washed, and neutralized. The cups shall be protected by an adequate and readily removable rust preventive to insure their receipt in a satisfactory condition. to insure their receipt in a satisfactory condition. 3,1.3 Hardness ofthe CUE.
8、 I in excessof Rockwell BW. No individual redings sha.1 exceed B72. cups are intended. approved by the contracting officer. The standard for microstructure shalLbe furnished or I 3.2.1 Ciassification of dimensional defects.- Dimensions out of drawing limits by amounts equal to or less than those sho
9、wn in table I shall be minor defects. those listed in table I shall be mador defects, deviation limit is listed in table I, any depazture from drawing require- ments shall be a major defect. Dimensions out of drawing limits by amounts greater than Where no dimensional Table I - Dimensional deviation
10、 limits. I . 0010“ .0005“ . 0005 11 II Wall thickness . 0000“ ! Base thicknessA . Wall thickness Tithin a lot of cups, base thickness mag be either ove: maximua limit or under the minimum limit of P amounts shorn ira tab,le I, but not both. _ - -_ Provided by IHSNot for ResaleNo reproduction or netw
11、orking permitted without license from IHS-,-,-MIL-C-32124 33 m 777770b 0273783 7 Table II - Visual defects. Mador Defects Minor Defects Scratohes - Scaly metal. Improperly omed or mutilated Oil, grease, dirt 0xiation3 Dents or bent &es- Scrap scaly shall be considered defective. Scaly metal includes
12、 slivers, wire eges, etc. In order to determine whether or not apparent laminations shall be counted aa defeots, cups shall be sectioned, poliehed, etched and examined with a microscope. more than O,O inch below the lowest point of the mouth level, the cup shall be called laminated. examined after s
13、ectioning. into %he body of the metal, the cups shall be considered defective, xidation includes discoloration because of failure. Leminations !I Any cup which appears, without mgnification, to be If a break extende Seame and cracka shall be If the sema and cracks extend in pickling sad rinsing to m
14、m the oxides formed in annealing. ,4 Acceptable cruaiits levels.- The acceptable quality levels ofthe eases with respect to visua and dimensional defecte shall be in mccorance with Standard Ma-STD-105 as follows: MaJor defects - 0.25 percent Minor defects - 2.50 percent 3.9 Workabi1itx.- The workabi
15、lity of the cups shall be such that 3. Worhemshi2.- The cups shall be uniform in quality, shall be they will process satisfactorily into cartridge cases. free of inJurious defeots except as provided in 3.2 and 3.3 aad shall be suitable for the intended purpose. . 4, SAMPLIXG, INSPECTION, AZBD TEST P
16、ROCEDURES 4.1 a.- A lot shall consist only of material fkan one heat of steel, of the same size cups, of the same condition, and shall not exceed 2,000,000 pieces or one carload capacity whichever is smaller. 4 - . - -I- ,/- 8 Provided by IHSNot for ResaleNo reproduction or networking permitted with
17、out license from IHS-,-,-MIGC-12124( Ord) 4.2 Classification of tests.- The inspection und tests of the case8 . shall be classifieif as follows: a. &ualifcaton b. Inspection 4.9 The qualification test shall consist of all the inspection bets 4.3.1 Chemical analysis.- Sampling and analysis shall be i
18、n accord- 4.3.2 Hardaess test.- Aminimm of 25 cups taken from the sample for herein and the folluwing additional tests. ance with Specif icatim QQ-M-151 wherever applicable e visual inspection and gaging shell be used for hardnessdeterminations. 4.3.2.1 Annealed cups.- Yne cups shall be mounted on a
19、n awil supporting the sidewall and the readings taken at the center of the outside sidewall. 4.3.2.2 Not annealed cup$.- The cups shall be mounted on an &il supporting %he base of the cup and readings shall be taken at the crenter of the outside baee wall. 4.3.3 Micro-examination.- Not less than thr
20、ee of the cups dch have satisfactorily passed the gaging and visual inspection shell be suiwly sectioned, polished, etche6, and examined for compiiance with the 8trrd.Ud for microstructure at a magnification of 1OOX. 4.3.4 Workability test. 4.3.4.1 A rana- aemple of at levt 5,000 cups from each lot
21、shall be subjected to a workability test which shall comprise all the operations in the manufacture of the cartridge case for which the cup.is intended. The workability test shall be made in the plant where the material is to be procemed, using tools, drawing COXUPOUS, etc., in accordance with usual
22、 manufacturing practice * 4.3.4.2 The workability test may be waived by the contracting officer if, in his opinion, .previous experience with the contractorrs cups indicates the tes to be unnecessary, 4.4 nspec tion. 4.4.1 Place.- Unless otherwise specified, inspection and tests shall be mae at plac
23、e of manufacture. 4.4.2 Gaz ing and visual inspection.- 91he size of the inspection sample shall be in accordance with inspection level III of Smard MIL-STD- 105. The sample shall be selected in approximately equal quantities from one-fourth of the containers holding the cups %n the lot or 10 contai
24、ners, whichever is greater. Each cup of the samgle shall be gaged and inspected visually for compliance with 3.2 and 3.3. 1 - 5 -_ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I al Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
