1、t e e26 -7 MIL-S-3037C 75 m 7977906 OLL4217 L m T IIIL-S-303gC (MR) 26 January 1988 SUPERSEDING 16 September 1982 MIL-S-3039B(MR) a a A MILITARY SPECIFICATION STEEL, STRIP, HIGH-CARBON, SPHEROIDIZED ANNEALED (FOR AMMUNITION CARTRIDGE CLIPS) This specification is approved for use by all Departments a
2、nd Agencies of the Department of Defense. 1. SCOPE 1.1 Scope, This specification covers one grade of cold finished carbon steel strip in the spheroidieed annealed condition. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications
3、, standards, and handbooks form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto , cited in the
4、solicitation. STANDARDS FEDERAL FED-STD-66 - FED-STD-183 - MILITARY MIL-STD-163 - Steel : Chemical Composition and Hardenability . Continuous Identification Marking of Iron and Steel Products. Steel Mill Products Preparation for Shipment and Storage. Beneficial comments (recommendations, additions,
5、deletions) and any pertinent data which may be of use in improving this document should be addressed to: Director, US Army Laboratory Command, Materials Technology Laboratory, ATTN: SLCMT-MEE, Watertown, MA 02172-0001 by using the Standardization Document Improvement Proposal (DD Form 1426) appearin
6、g at the end of this document or by letter. DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited, , THIS DOCUMENT CONTAINS 4 PAGES. f Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-3039C (MR) (Copies of specifications,
7、standards, handbooks, drawings, publications, and other Government documents required by contractors in connection wih specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity. ) 2.2 Other publications, The following document(s) form
8、a part of this specification to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted shall be those listed in the issue of the DODZSS specified in the solicitation, apecified, the issues of documents not listed in the DODISS shall be the issue of
9、 the non-Government documents which is current on the date of the solicitation, Unless otherwise AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM E350 - Methods for Chemical Analysis of Carbon Steel, Low Alloy, Silicon ASTM A370 - Mechanical Testing of Steel Products ASTM E112 - Methods for Es
10、timating the Average Grain Size of Metals (Application for copies should be addressed to the American Society or Electrical Steel, Ingot Iron and Wrought Iron Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Inudstry association specifications and standards are generally available
11、for reference from libraries. groups and using Federal agencies. ) They are also distributed among technical 2.3 Order of precedence. In the event of a confiict between the text of this specification and the references cited herein, the text of this specification shall take precedence, 3. REQUIREMEN
12、TS 3.1 Chemical Composition. The chemical composition of the steel shall meet the requirements of table i. shall be furnished by the contractor. A cast or heat analysis of each heat of steel TABLE I. Chemical composition, cast or heat analysis. Element Percent Carbon Manganese Phosphorous Sulphur Si
13、licon 0.43-0.50 0 45-00 75 0.030 max. 0.035 max. O. 15-0.35 3.Li Product analysis tolerances. Product analysis tolerances shall be in accordance with FED-STD-66. Mechanical properties, I rl, I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-303
14、9C (MR) 3.2.1 Tensile. The tensile strength of the annealed strip may be specified (see 6.2) in which case the specimens representing the steel. shall meet the requirements as specified in the invitation for bids, request for proposal, on the drawing, or in the contract or order (see 6.2). 3.2.2 Har
15、dness. The hardness of the annealed strip may be specified (see 6.2), in which case the steel shall meet the requirements specified in the invitation for bids, request for proposal, on the drawing, or in the contract or order (see 6.2). 3.2.3 Bending. Unless otherwise specified (see 6.2), the specim
16、ens representing the strip shall withstand cold bending without cracking on the outside of the bent portion as indicated in table II. TABLE II. Cold bending requirements. Degree Ratio inside radius Relation of bend to of bend to thickness rolling direction 1800 Flat back 1800 t/2 a longitudinal tran
17、sverse a Up to 0.0062-inch (0.16 mm) thickness maximum. 3.3 Austenite grain size. The steel shall have an austenite grain size of 5 or finer. This requirement shall be met if 70 percent or more of the grains are size 5 or finer. 3.4 Condition. The strip shall be furnished in the spheroidized anneale
18、d When specified (see 6.2), condition and shall be free of lamellar pearlite. the microstructure shall conform to standards furnished by the procuring activity. 3.5 Decarburization. The strip shall not show a depth of total and partial decarburization in excess of 0.001 inch (0.025 mm), or 1.5% of t
19、he thickness of the strip, whichever is greater. The standards for depth of decarburiza- tion shall be furnished or approved by the procuring activity (see 6.2). 3.6 Hardenability. When heat treated in accordance with the appplicable cartridge clip drawing, the strip shall be capable of attaining th
20、e hardness specified in the applicable drawing. 3.7 Fabricating requirements. Strip .shall be capable of withstanding the fabricating test without failure (see 4.5.9). 3.8 Dimensions and tolerances. Strip shall meet the dimensions and tolerances shown in the applicable cartridge drawing, or in the c
21、ontract or order (see 6.2) and as specified below. 3.8.1 Width. Unless otherwise specified (see 6.2), the nominal width of the strip shall be 3-3/4 inches (95.3 mm) . 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-3039C (MR) 3.8.2 Crown. Cro
22、wn shall be limited so that the thickness across the width of the strip shall be within the specified tolerances. 3.8.3 Camber. The strip shall not vary in edgewise straightness by more than 1/4 Inch(6.35 mm) in an eight foot (2.4 m) length. finish, regular bright finish. 3.9 Finish. Unless otherwis
23、e specified (see 6.2), strip shall have a No. 2 3.10 Edge. Unless otherwise specified (see 6.2), the strip shall have a No, 3 edge, slit edge (approximately square edge produced by slitting, not filed) b 3.11 Identification marking. Each coil shall be marked in accordance with FED-STD-183 or as agre
24、ed upon by the contractor and procuring agency. 3.12 Workmanship. Strip shall be clean, commercially free from rust, scabs, seams, pits, blisters, laminations, and other imperfections detrimental to the specific use. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise
25、 specified in the Except as otherwise contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of
26、the inspection requirements specified herein, unless disapproved by the Government. The Government reserve8 the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 $
27、-J. Unless Otherwise specified (see 6.2), a lot shall consist of all strip from the same heat, from the same annealing charge subject to inspection at the same time. 4.2.1 Austenite grain size. A lot for austenite grain size determination shall be one heat. 4.3 Sampling. 4.3.1 Chemical analysis. One
28、 sample shall be taken from at least 3 coils in each lot for product analysis by the procuring agency. taken in accordance with instructions in ASTM ESSO, Samples shall be 4.3.2 Mechanica properties. 4.3.2.1 Tensile. When tensile strength is specified (see 3.2.l), two samples shall be taken from eac
29、h lot. 4.3.2.2 Hardness. When hardness requirements are specified (see 3.2.2), at least 10 percent of the coils in each lot shall be sampled for hardness testing . 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-3039C 95 997790b OLL4223 3 U 4
30、.3.2.3 Bending. Unless otherwise specified in the invitation for bids, request for proposal, or in the contract or order (see 6.2), samples for bend testing shall be taken from at least 25 percent of the coils in each lot. Sampling may be reduced to 10 percent of the lot in the presence of evidence
31、to the procuring activity that the method of manufacture and ductility of the strip are suitably uniform. Each sample shall be of sufficient size for one longitudinal and one transverse bend specimen and shall represent the full width of the strip. 4.3.3 Austenite grain size. One sample from each he
32、at shall be taken for austenite grain size determination. 4.3.4 Condition. Samples for microexamination of the spheroidized annealed condition shall be taken from two coils in each lot. 4.3.5 Decarburization. Samples for decarburization determination shall be taken from two coils in each lot. 4.3.6
33、Hardenability. Samples for the hardenability test shall be taken from two coils in each lot. 4.3.7 Fabrication. At least 5 coils shall be taken from each lot or fabrication testing. 4.3.8 Visual and dimensional. The coils selected for the bending test samples shall be used for visual and dimensional
34、 sampling. 4.4 Examination. 4.4.1 Visual. Sample coils selected in accordance with 4.3.8 shall be examined for conformance with the requirements for finish (see 3.9), edge (see 3.10), identification marking (see 3.11) and workmanship (see 3.12). 4.4.2 Dimensions and tolerances. A representative numb
35、er of measurements shall be taken on the sample coils to determine compliance with the requirements for dimensions and tolerances (see 3.8). 4.4.3 Packaging inspection. Prior to shipment, examination shall be made to determine compliance with the requirements of section 5. 4.5 Tests. 4.5.1 Test spec
36、imens. 4.5.1.1 Chemical composition. Test samples and specimens shall be prepared in accordance with instructions in ASTM E350. 4.5.1.2 Tensile. Test specimens shall be in full section or shall be machined to the form and dimensions of the sheet type specimen of ASTM A370. 4.5.1.3 Hardness. Specimen
37、s shall be prepared in accordance with ASTM A370. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-3039C( MR) 4.5.1.4 Bending. Specimens shall be prepared in accordance with ASTM A370, The specimens for longitudinal testing shall represent the f
38、ull width of the strip and for transverse specimens shall be at least 2 inches (50.8 mm) in the direction parallel to the rolling and the 1111 width transverse to the rolling direction. 4.5.1.5 Austenite grain size. The specimen shall be prepared in accordance with ASTI8 E112. 4.5.1.6 Condition. Two
39、 specimens shall be prepared at least one inch (25.4 mm) in length and the full thickness of the strip, be prepared in the longitudinal direction and one in the transverse direction for metallographic examination. to insure freedom from disturbed metal. One specimen shall Specimens shall be prepared
40、 using precautions 4.5.1.7 Decarburization. The specimens prepared for determining spheroidization shall be used for determination of decarburization, 4.5.1.8 Hardenabilitx, The samples shall be heat treated in accordance with the heat treating instructions on the applicable cartridge clip drawing a
41、nd prepared for hardness testing in accordance with ASTM A370. 4.5.2 Test procedures. 4.5.2.1 Chemical composition. Chemical analysis shall be conducted in accordance with instructions in ASTM E350. 4.5.2.2 !?ensile. Tensile tests, when specified (see 3.2.1), shall be conducted in accordance with AS
42、TM A370. 4.5.2.3 Hardnesar Hardness tests, when specified (see 3.2.2), shall be conducted in accordance with ASTM A370. Hardness readings shall be taken near the end of the sample coils. 4.5.2.4 Bending. Bend tests shall be conducted in accordance with ASE4 A370. 4.5.2.5 Austenite grain size. Austen
43、ite grain size shall be determined in accordance with ASTM E112. 4.5.2.6 Condition. Microexamination of the prepared specimens shall be made to determine conformance with 3.4 and comparison made against the standard furnished by the procuring activity. 4.5.2.7 Decarburization. Depth of decarburizati
44、on shall be determined microscopically and comparison made against the standards furnished by the procuring activity. 4.5.2.8 Hardenability. Hardness testing on the heat treated samples shall be conducted in accordance with ASTM A 370. Hardness readings shall be taken at intervals of one inch (25.4
45、mm) or less across the width of the strip, 4.5.2.9 Fabrication. The sample coils shall be fabricated, to the extent necessary, including heat treatment, to determine the suitability of the strip for ita intended use. Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
46、e from IHS-,-,- MIL-S-3037C 75 W 7797706 Oll9225 7 MIL-S-3039C (MR) 4.6 Rejection and retests. 4.6.1 Examination. If the sampling for visual, 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
47、 lot shall be rejected for failure to comply with any of the specified test requirements when tested in accordance with 4.5. 4.6.3 Retests. When no sampling plan is provided or approved by the procuring agency (see 6.2) and where there is evidence that indicates that the specimen was not representat
48、ive of the lot of material, and when the detail specification does not otherwise specify, at least two specimens shall be selected to replace each test specimen which failed. All specimens so selected for retest shall meet the requirements of the specification or the lot shall be subject to rejectio
49、n. 5. PACKAGING 5.1 Packaging requirements. The requirements for packaging shall be in accordance with MIL-STD-163 for the levels or degree of protection specified (see 6.2). 5.2 Marking. In addition to any special marking required by the contract or 0rde-6.2) shipments shall be marked in accordance with the require- ments of MIL-STD-163. 6. NOTES 6.1 Intended use. The cold finished carbon steel strip in the spheroidized annealed condition, cover
