1、MI 1-STD-1170 (M U) io NOVEMBER 1964 r 4 MILITARY STANDARD VISUAL STANDARDS AND COMPARISION METHODS FOR EVALUATING GRAIN CONFIGURATION IN 7.62 MM CARTRIDGE CASES i THIS DOCUMENT CONTAINS Id PAGES. FSC 1305 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
2、,-,-_. - _- - MIL-STD-3.370 33 m 7779731 0075070 5 a EIIL-STW1170 (NU) 10 November 1964 DEPARTMENT OF THE ARlTiI MUNITIONS COMMAND Visual Standards and Comparison Methods for Evaluatinp Grain Configuration in 7.62 HM Cartridge Cases. MIL- STlb 11 70 (NU) 1. This Military Standard has been approved b
3、y the U. S. Army Munitions Command and is to be used to supplement 7.62 MM cartridge specifications. 2. Recommended corrections, additions or deletions should be addressed to the Cornanding Officer, U. S. Amy Frankford Arsenal, ATTN: SMUFA-J4000, Philadelphia, Pa. 19137. Provided by IHSNot for Resal
4、eNo reproduction or networking permitted without license from IHS-,-,- 7 MIL-STD-1170 13 7777711 0075071 7 m 1.iI.L- STD- 11 70 (MU) 10 November 1964 FOREWORD This ffilitary Standard forms an integral part of 7.62 Mtl cartridge specifications to the extent referenced therein. It contains the metallu
5、r- gical requirements for grain configuration along the sidewall of the cartridge case in the form of photographic standards (Figure 1 thru 6) and provides not only an approved method for preparing test samples but also comparison methods for their evaluation. iii Provided by IHSNot for ResaleNo rep
6、roduction or networking permitted without license from IHS-,-,-MIL-STD-3370 33 m 7777733 0075072 7 m MIL-STU-1170 (NU) 10 November 1364 CONTENTS Paragraph Pape 1. Scope- 1 2, 1 2.1 Visual grain configuration standards - - - - - - - - - 1 3. 1 3.1 1 3.1.1 1 3.1.2 1 3.2 Preparation of test samples - -
7、 - - - - - - - - - - - - 2 4. 2 Fletallurgical requirements Inspection procedures Comparison methods Method A - Photomicrographs - - - - - - - - - - - - - - tlethod A - Positive Transparencies availability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
8、- - - - - - - - - - - - - - - - - - - - - - - - - - - - - Ilocurnent ? PHOTOMICROGWIIS Figure 1. 1/4“ from head, mapnified 75X 2. 1/2“ 11 11 11 3. 3/4“ I II II 11 111 11 11 II II 4. 5, 1 1/4“ II II 11 6. 1 1/2“ II II II I1 iV Provided by IHSNot for ResaleNo reproduction or networking permitted witho
9、ut license from IHS-,-,-MIL-STD-1170 (MU) 10 November 1964 r 1. provides the inspection procedures for the evaluation of grain configura- tion along the sidewall of 7.62 MM cartridge cases. It is to be used to supplement the cartridge specification to the extent referenced therein. Scope - This stan
10、dard defines the metallurgical requirements and also 2 . Metallurgical requirements . 2.1 Visual grain configuration standards - The visual grain configuration standards (Figure 1 thru 6) denote the allowable variation in grain configuration of 7.62 bM cartridge cases along the sidewall from the hea
11、d at the distance stated, magnified 75X and are to be used as referenced herein and in the cartridge specification. 3. Inspection procedures. 3.1 Comparison methods - The basic criteria for the determination of acceptable grain configuration is to observe that no grain configuration appears overall
12、coarser than the applicable visual grain configuration standard marked “no coarser“ nor finer than the counterpart marked “no finer.“ This shall be accomplished by one of the following methods: Method A - Photomicrographs Method E - Positive transparencies 3.1.1 Ikthod A - Photomicrographs - Test sa
13、mples prepared in accord- ance with 3.2 shall be set up in surroundings that will provide the desired photographic effect when the test equipment is adjusted to 75X mqnifca- tion. One set of photomicrographs shall be taken of each properly prepared test sample, each set consisting of one photomicrog
14、raph at every location noted in the cartridge specification. cases shall be made by comparing the photomicrographs of the test samples with the applicable grain configuration standards contained herein. Determination of acceptable cartridge 3.1.2 Nethod ._ B - Positive transparencies - Test samples
15、prepared in accordance with 3.2 shall-be placed in a sitable device that will produce an image of the grain configuration at 75X magnification for each properly prepared test sample at the various locations noted in the cartridge specification. Determination of acceptable cartridge cases shall be ma
16、de by comparing these images simultaneously with the applicable positive i- - 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-* MIL-STD-3370 33 W 7777733 0075074 2 W MIL-STD-1170 (PIU) 10 November 1964 transparencies of the grain configuration stan
17、dards. cies, as tools, will be suppled on a need to have basis as part of the inspection equipment list Positive transparen- 3.2 Preparation of test samples - The quantity of cartridges prescribed in the cartridge specification for grain configuration evaluation shall be prepared as follows: (a) Sep
18、arate the bullet from the case, remove the propellant and extract the primer. (b) Prepare a highly polished flat surface approximately 1/8“ wide along the length of the case from the head to the shoulder, (c) Etch the polished flat surface with an acid solution. This can be accomplished through the
19、application of a chromic acid solution. Human contact with the acid solution should be avoided through the use of protective clothing. surface with absorbent surgical cotton, wash immediately thereafter with water and dry thoroughly under a warm airstream. etching consists of the following: Daub the
20、 solution onto the polished and cleaned flat A solution suitable for 3400 ml f120 280 cc H2S04 (concentrated & cliemically pure) 70 gm K2Cr207 140 ml NaC1 (saturated solution) 4. through normal channels. basis through the Commanding Officer, U. S. Army Frankford Arsenal, Philadelphia, Pennsylvania,
21、19137. Document availability - MIGSTD-1170 (Mu) will not be distributed Suppliers can secure copies on a need to have Custodian: AITNI - NI 2 Preparing activity: I .:. Arniy - MU . . . . .2 . . : . , . . . . : Project No . 11-305+A312 - e Provided by IHSNot for ResaleNo reproduction or networking pe
22、rmitted without license from IHS-,-,-MIL-STD-1170 13 7777711 0075075 L1 L-STD-1170 10 November Figure I. Grain Configuration Standards - Grain configuration of 7.62m cartridge case along the side wall (1/4“) from head, projected at 75X, shall be no coarser or no finer than shown in the top and botto
23、m illustrations, respectively. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1170 13 rn 7777711 007507b b m MIL-STD-1170 (MU) 10 November. 1964 Figure 2. Grain Configuration Standards - Grain configuration of 7.62mm cartridge case along the
24、 side wall (1/2“) from head, projected at 75X, shall be no coarser or mo finer than shown in the top and bottom illustrations, respectively. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-! MIL-STD-1170 13 H 7777711 0075077 II :L-STD-l170 (MU 10 Nov
25、ember 1964 Figure 3. Grain Configuration Standards - Grain configuration of 7.62m cartridge case along the side wall (3/4“) from head, projected at 75X, shall be no coarser or no finer than shown in the top and bottom illustrations, respectively. Provided by IHSNot for ResaleNo reproduction or netwo
26、rking permitted without license from IHS-,-,-MIL-STD-1170 13 7777711 0075078 T MIL-STD-1170 (MU) 10 November 1964 Figure 4. Grain Configuration Standards - Grain configuration of 7.62mm cartridge case along the side wall (1“) from head, projected at 75X, shall be no coarser or no finer than shown in
27、 the top and bottom illustrations, respectively. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1170 (MU) 10 November 1964 Figure 5. Grain Configuration Standards - Grain configuration of 7.62mm cartridge case along the side wall (i!$) from
28、head, projected at 75X, shall be no coarser or no finer than shown in the top and bottom illustrations, respectively. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-, MIL-STD-1170 13 m 7777711 0075080 8 m - _ MIL- STD- 1170 (MU) 10 November 1964 Fig
29、ure 6. Grain Configuration Standards - Grain configuration of 7.62m cartridge case along the side wall (1-1/281) from head, projected at 75X, shall be no coarser or no finer than shown in the top and bottom illustrations, respec- tively. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
