1、MI L-S- 117 13C 2.5 April 1983 SUPERSEDING MIL-S-17713B 12 March 1964 MILITARY SPECIFICATION STEEL STRIP, CARBON, SPRING: FOR MECHANICAL TIME FUZE COMPONENTS mt. AILS specification is approved for use by all Depart- ments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specificat
2、ion covers carbon spring steel in strip form (see 6.1). 1.2 C.lass.if ication. 1.2.1 Comos.i,t.i.on. The steel is furnished in the following compositions, as specified (see 3.1 and 6.2). Composition 1 - Medium carbon spring steel, low phosphorus, low Composition 2 - Regular medium carbon spring stee
3、l. Composition 3 - High carbon spring steel. sulfur. 1.2.2 Condition. The steel is furnished in the following conditions: Composition 1 - Soft type annealed - dead soft. Composition 2 - Soft type annealed - dead soft. Composition 3 - Spheroidize annealed type. 2. APPLICABLE DOCUMENTS 2.1 Government
4、documents. 2.1.1 Specif ica.tions, standards, and handbooks. Unless oterwise specified, the following specifications, standards, and handbooks of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of th
5、is specification to the extent specified herein. beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Director, US Army Materials and Mechanics Research Center, ATTN: DRXMR-SMS, Watertown, MA 02172 b
6、y using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. r THIS DOCUMENT CONTAINS 9 PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-11713C STAN DAEU) S FE
7、DERAL Fed, Std. No, 66 - Steel: Chemical Composition and Hardenability, Fed. Test Method Std. No, 151 - Metals: Test Methods. Fed, Std. No. 183 - Continuous Identification Marking of Iron and Steel Products MILITARY MIL-STD-163 - Steel Mill Products Preparation for Shipment and Storage. (Copies of s
8、pecifications, standards, and drawings required by contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer,) 2.2 Other Pwblications. The following documents form a part of this specification to the extent
9、specified herein. which are indicated as DOR adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. The issues of the documents AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM E 18 - Methods of Test for Rockwell Hardness and Rockwell ASTM E 290 - Se
10、mi-Guided Bend Test for Ductility of Metallic Materials Superficial Hardness of Metallic Materials (Applications for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Industry association specifications and standards are general
11、ly available for reference from libraries. They are also distributed among technical groups and using Federal agencies,) 2.3 0.rder of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence.
12、3. REQUIREMENTS 3.1 Pilot sample. Unless otherwise specified in the invitation for bids, contract or order (see 6.2), the supplier shall submit a sample, prior to the shipment of each lot, for blanking, forming, and piercing to the facility designated in the contract or order. not be required if the
13、 accepted orders are within a three-month period. Pilot samples from the same supplier may 32 Chemical composition. The chemical composition of the steel shall meet the requirements of table I. A cast or heat analysis of each heat of steel shall be furnished by the contractor. Provided by IHSNot for
14、 ResaleNo reproduction or networking permitted without license from IHS-,-,-a a a MIL-S-LL7L3C 95 9999906 0IL.bOIL 9 MIL-S- 11713C TABLE I. Chemical composition, cast or heat analysis Pho spho rus , Carbon Manganese maximum maximum Silicon Su lp hu r , Composition percent percent percent percent . p
15、e r.c e n t . 1 U. 65-0.75 O. 33-0.60 o. 025 0.025 O. 15-0.25 2 . 65-0.7 5 O. 60-0.90 O. 040 0.050 O. 15-0.25 3 0.90-1.93 0.30-0.50 0.025 0.025 O. 15-0.25 3.2.1 Product analysis tolerances. Product analysis tolerances shall be in accordance with Fed. Std. No. 66. 3.3 Mechanical properties. 3.3.1 Har
16、dness. The steel strip shall meet the hardness requirements shown in table II. TABLE b Hardness Rockwell hardness Composition 15 T scale 1 2 3 88 max, 88 max. 88-91 3.3.2 Bendinq. Steel strip of compositions 1 and 2 in the annealed con- dition shall withstand being bent at room temperature without c
17、racking flat on itself longitudinally and transversely through an angle of 180 degrees around a radius equal to the thickness of the strip. 3.4 Decarburization. Depth of total and partial decarburization of the steel shall not exceed 0.001 inch (0.025 mm) or 3 percent of the thickness, whichever is
18、greater (see 6.3). 3.5 Metallographic. Composition 3 shall show a fully spheroidized structure free from lamellar pearlite. 3.6 Dimensions and tolerances. Steel strip shall meet the dimensions specified in the invitation for bids, contract or order (see 6.2). on specified sizes shall be as follows.
19、Tolerances 3.6.1 Thickness. Unless otherwise specified (see 6.2), the strip shall not vary in thickness more than the amounts shown in table III. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-11713C Table III. Thickness tolerance Up to 0,01
20、2 (0,30), incl. 0.0003 (0.0076) Over 0.012 (0.30) to 0.020 0005 (O. 0127) (O. 51) I incl. (O. 64) , incl. (0.76) , incl. Over 0,020 (0.51) to 0.025 .O007 (0.0178) Over 0.025 (0.64) to 0,030 .O010 (0.0254) -_ .- - - - -a- - ._ -42c _ .-.- _. _-. - - - - - -.- .-.- - - -. 3.6.2 m. Unless otherwise spe
21、cified (see 6.2), the strip shall not vary from the speciied width by more than plus or minus 0.005 inch (0.127 mm) for widths up to and including 9 inches (229 mm). 3 6 o 3 CttQS_Syb-x . Tolerances on cross-bow shall be negotiated between the contractor and the procuring activity. 3.6.4 . Camber is
22、 the deviation of a side edge from a straight line. The deviation shall be obtained by placing an 8-foot (2.4 m) straight edge on the concave side and measuring the maximum distance between the steel edge and the straight edge. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted w
23、ithout license from IHS-,-,-MIL-S-11713C 4.4.3 Packacli.na inspection. Prior to shipment, examination shall be made to determine conformance with the requirements of section 5. 4.5 Tests. 4.5.1 Test. specimens. 4.5.1.1 Ckemical composition. Test samples and specimens shall be prepared in accordance
24、with method 111 or 112 of Fed. Test Method Std. No. 151, as applicable. 4.5.1.2 Hardness. Specimens shall be prepared in accordance with ASTM E 18. 4.5.1,3 Bending. One longitudinal and one transverse specimen shall be prepared in accordance with ASTM E 290. 4.5.1.4 Decarburization (see 6.3). and m.
25、e.tal1wxephi.c. Two specimens shall be prepared from each sample. The prepared surface of the specimen shall be not less than 1 inch (25.4 mm) in length representing the full thickness and shall be perpendicular to the direction of rolling. prepared using precautions to ensure freedom from disturbed
26、 metal (see 6.3). Specimens shall be 4,5.2 Test procedures. 4.5.2.1 Chemical compos,ition. Chemical analysis shall be conducted in accordance with method 111 or 112 of Fed. Test Method Std. No. 151. Referee analysis shall be by method 111. 4.5.2.2 Hardness. Hardness tests shall be conducted in accor
27、dance with ASTM E 18. 4.5.2.3 Bending,. Cold bending tests shall be conducted in accordance with ASTM E 290, 4.5.2.4 Decarburization (see 63) and metallwraphic. Microexamination of specimens shall be made at a magnification of 100 diameters. 4.6 Rejection. 4.6.1 Examination, If the sampling for visu
28、al, dimensional, or packaging fails to meet the requirements of this specification when examined in accordance with 4.4, the lot shall be rejected. 4.6.2 Tests. A lot shall be rejected for failure to comply with any of the specified requirements when tested in accordance with 4.5. 4.6.3 Retests. Ret
29、ests shall be permitted in accordance with Fed. Test Method Std. No. 151. a a O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-11713C 5. PACKAGING 5.1 Pac.kaginq requirements, The requirements for packaging shall be in accordance with MIL-CTD-
30、163 for the levels or degree of protection specified (see 6.2). 5.2 Markina, In addition to any special marking required by the contract or order (see .2), shipments shall be marked in accordance with the requirements of MIL-STD- 16 3 . 5.3 Markinq for delivery. In addition to marking specified in t
31、he contract or order (see 6.2), shipments shall be marked in accordance with MIL-CTD-163. 6. NOTES 6.1 1ntend.ed use. The steel strip covered by this specification is for a throughout the highly specialized application in timing movements and it is essential that the steel be homogeneous and uniform
32、 in thickness and quality coil. 6.1.1 Cornposition 1 is intended for use in mechanical time levers an timing disk springs. 6.1.2 Composition 2 is or mechanical time fuze hammer spr adjusting guides. 6.1.3 Composition 3 is for mechanical time fuze disks. fuze escapement ngs and 6.1.4 Compositions 1 a
33、na 2 are heat treated by the purchaser. Composition 3 is used in the as received condition. 6.2 Ordering data. Purchasers should select the preferred options permitted herein and include the following information in procurement documents: Title, numbert and date of this specification. Composition (s
34、ee 1.2.1 and 3.2). Destination of pilot sample (see 3.1) Dimensions (see 3.6) . Width tolerances, if other than as specified herein (see 3.5.2). Finish, if other than No. 2 is required (see 3.7). Edge, if other than No. 3 slit edge is required (see 3.8). Lot size, if other than as specified in 4.2.
35、Levels of packaging and packing desired (see section 5). When special marking for shipment requirements are necessary (see 5.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-11713C 6.3 Decarburization. Measurement of decarburization by micro
36、examination is contained in Society of Automotive Engineers Recommended Practice 5419, CAE Handbook 1963, Society of Automotive Engineers, 485 Lexington Avenue, New York, NY 10017. Custodians: Navy - OS Amy - MR Preparing activity: Project No. 9515-0394 Army - MR Review activity: Army - MI User activity : Army - AR (KBWP# ID-O239A/DISK 0207A. FOR AMMRC USE ONLY) 5 US, QOVERNMLNT CRINTINO OVFlCII 1130Q34/2111 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
