1、MIL-C-2LI723 ME m 7777906 OLL7028 8 m G- 5f7- 07 “5“ 3 METRICI MIL-C-24723 7 June 1989 MILITARY SPECIFICATION CASTINGS, NICKEL-COPPER ALLOY This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 ScoDe. This specification covers three nickel-
2、copper alloys for static or centrifugal casting for corrosion resistant service. 1.2 Classification. Nickel-copper alloy castings shall be of the following compositions, as specified (see 6.2): Composition M-30C (see 6.1.1) M-30H (see 6.1.2) “25s (see 6.1.3) 2. APPLICABLE DOCUMENTS 2.1 Government do
3、cuments. 2.1.1 Specifications, standards, and handbooks. The following specifica- tions, standards, and handbooks form a part of this document to the extent speci- fied herein, Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index
4、of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which msy be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 55
5、23, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A AREA MECA DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. THIS
6、 DOCUMENT CONTAINS /o PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-24723 STANDARDS FEDERAL FED-STD-102 - Preservation, Packaging, and Packing Levels. FED-STD-123 - Marking for Shipment (Civil Agencies). FED-STD-182 - Continuous Ident
7、ification Marking of Nickel and Nickel Base Alloys. MILITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-248 - Welding and Brazing Procedure and Performance Qualification. MIL-STD-271 - Requirements for Nondestructive Testing Methods. MIL-STD-278 - Welding and Casting Standard. (Unless o
8、therwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Naval Publications and Forms Center, (ATTN: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 2.2 Non-Government publications. The following documents form a part of this documen
9、t to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in
10、 the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A 494/A 494M - Standard Specification for Castings, Nickel and A 802/A 802M - Standard Practice for Steel Castings, Surface Nickel Alloy. Acceptance Standards, Visual Examination. (Application for copies should be address
11、ed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or o
12、ther informational services.) 2.3 Order of precedence. In the even.t of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption
13、has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.4) in accordance with 4.3. 3.1.1 No change shall be made to the casting method used for first article sample without specific approval of the Command or agen
14、cy concerned (see 6.4.1). 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-24723 3.2 Materials. In addition to the requirements specified in ASTM A 494, nickel-copper castings shall be in accordance with 3.3 through 3.9. Unless otherwise speci
15、fied (see 6.2), either centrifugal or static castings may be supplied at the option of the foundry. 3.3 Chemical composition. The chemical composition shall be in accordance with ASTM A 494 (see 4.4.3) except iron content shall be 2.5 percent maximum. 3.4 Mechanical properties. The mechanical proper
16、ties shall be in accord- ance with ASTM A 494 (see 4.4.3) except for composition “25s Which shall meet the requirements of 3.4.1. 3.4.1 Composition “25s. Unless otherwise specified (see 6.2), the hardness of “25s shall be the only mechanical property required. The hardness shall be 300 Brinell minim
17、um. As-cast material may be aged to achieve this hardness. When tensile properties are specified, they shall meet the requirements of table I. TABLE Tensile strength , minimum lb/in2 120,000 I. Mechanical properties for composition “25s. Yield strength, at 0.2 percent Elongation Hardness , offset or
18、 0.5 in 2 inches, Brinell, percent extension minimum 3000Kg under load, lb/in2 80,000 10 250 - 300 3.5 Weldability. Composition M-30C shall conform to the weldability requirement specified in ASTM A 494. 3.6 Soundness. Castings shall be free of cracks, hot tears, non-metallic inclusions, shrinkage,
19、laps, fins and gas porosity, that may be detected by visual examination or are revealed by manufacturing operations performed subsequent to acceptance or by nondestructive inspections as specified (see 4.4.2). Perfects are as defined in ASTM A 802/A 802M. 3.7 Repair of castings. In addition to the r
20、equirements specified in ASTM A 494, weld repair of M-30C alloy shall be performed in accordance with MIL-STD-278 or an equivalent welding control standard, as specified (see 6.2). Welding procedure and welders shall be qualified in accordance with MIL-STD-248 or the standard specified (see 6.2) pri
21、or to production. M-30H and “25s alloys shall not be weld repaired. 3.8 Identification marking. Individual castings shall be marked in accord- dance with FED-STD-182. In addition, the following marking shall also be applied: (a) Pattern or drawing number. (b) Lot or heat number. (c) Foundrys name or
22、 trademark. Where castings cannot be marked, the required information shall be recorded on a metal or oil proof tag which shall be affixed to the individual casting. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-24723 3.9 Recovered material
23、s. Unless otherwise specified herein, all material incorporated in the castings covered by this specification shall be produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials“ means materials which have been collected o
24、r recovered from scrap, from manufacturing operations or secondary metal sources and reprocessed to become a source of raw materials, as opposed to virgin raw materials. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, t
25、he contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection require
26、ments specified herein, unless disapproved by the Government. The Govern- ment reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.1 Responsibility for
27、 compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor
28、 of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of the manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this do
29、es not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material (see 6.3). 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: (a) First article inspection (see
30、4.3). (b) Quality conformance inspection (see 4.4). 4.3 First article inspection. First article inspection shall consist of the examinations and tests as specified in 4.3.2 and 4.3.3 (see 6.3). 4.3.1 Sampling for first article inspection. The first casting of a given design submitted for inspection
31、shall be the first article sample. 4.3.2 Radiographic inspection. The first article casting shall be radio- graphically inspected in accordance with MIL-STD-271 to the acceptable criteria specified in MIL-STD-278 or other applicable standard to the criticality level as specified (see 6.2). 4.3.3 Mec
32、hanical property test. Mechanical properties for first article inspections shall be determined on highly stressed regions of the casting as specified (see 6.2) and shall meet requirements as agreed upon between the Command or agency concerned and the contractor and be compared to values obtained fro
33、m test bars of 4.4.1. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-24723 ME m 997990b OLL9032 T W MIL-C-24723 4.4 Oualitv conformance inspection. 4.4.1 Samplinq. 4.4.1.1 Lot definition, A lot shall consist of all castings from the same hea
34、t (see 6.7.1). 4.4.1.2 Sampling for chemical analysis. One sample shall be taken from each lot. 4.4.1.3 Sampliw for mechanical propertv tests. Two tensile specimens shall be taken from each lot. When hardness is required it shall be taken on at least two castings in the lot. 4.4.1.3.1 Static casting
35、s. - Separately cast test blocks of the shape and dimensions shown on figure 1 shall be cast with each heat. Separate castings may be used at the foundrys option. Unless attached test coupons are specified (see 6.2), use of chills or chill molds is prohibited. 4.4.1.3.2 Centrifugal castings. - Centr
36、ifugal castings shall have extra length provided, as necessary, for test specimens. When extra length or an additional production casting cannot be provided, separately cast test specimens may be provided. The size of separately produced castings shall be as follows: (a) The castings cross section s
37、hall be within plus or minus 1 inch (b) The casting shall be of sufficient thickness to remove test (c) The length of the casting shall be at least twice the size of the thickness of the production casting. specimens. cross section. 4.4.1.4 Samvling for weldabilitv test. Sampling for weldability tes
38、t shall be in accordance with ASTM A 494 for static castings. For centrifugal castings, material produced from separately centrifugally cast test material can be used for the weldability test. At least one test bar shall be provided for the weld- ability test. 4.4.1.5 Samulinp for nondestructive tes
39、ts. Unless otherwise specified (see 6.2), nondestructive tests are required. Unless otherwise specified (see 6.2), each casting shall be inspected. 4.4.1.6 Sampling for visual and dimensional examination. Samples shall be selected from each lot for visual and dimensional examination in accordance wi
40、th table II. If the number of defective items found in the lot equals or exceeds the rejection number specified in table II, the lot shall be rejected. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-ZLI723 ME m 9999906 0339033 3 m ” - MIL-C-
41、24723 TABLE II. SamplinP for visual and dimensional examination. Lot size 2 - 15 16 - 25 26 - 90 91 - 150 151 - 280 281 - 500 501 - 1200 Sample size 2 3 5 8 13 20 32 Accept number O O O 1 1 2 3 Reject number 1 1 1 2 2 3 4 4.4.2 Examination. 4.4.2.1 Visual and dimensional examination. Each of the cas
42、tings selected in accordance with 4.4.1.6 shall be visually examined for conformance to 3.7 and 3.8 and with the workmanship, finish, and appearance requirements of ASTM A 494. They shall be dimensionally examined for conformance to the-drawing or pattern. Any castings in the lot containing one or m
43、ore visual or dimensional defects shall be considered a defective item and shall be rejected. 4.4.2.2 Soundness. Unless otherwise specified (see 6,2), castings shall be inspected for soundness in accordance with MIL-STD-278 or other standards as specified (see 6.2). 4.4.3 Chemical analvsis, tensile
44、tests. hardness test, and weldability test. The chemical analysis and tensile test for quality conformance inspections shall be performed in accordance with ASTM A 494. The hardness and weldability test shall be performed in accordance with the supplemental requirements specified in ASTM A 494. 4.5
45、InsDection of packagine;. - Sample packages and packs, and the inspection of the preservation-packaging, packing and marking for shipment and storage shall be in accordance with the requirements of section 5 and the documents specified therein. 5. PACKAGING (The packaging requirements specified here
46、in apply only for direct Govern- ment acquisition.) 5.1 PackaPing. The castings shall be separated by size, composition, grade, or class and shall be packaged level A, B, or C as specified (see 6.2). The requirements of FED-STD-102 shall be referenced for definitions of the various levels of packagi
47、ng protection. 5.2 Marking. In addition to any special marking required (see 6.2), marking for shipment shall be in accordance with MIL-STD-129 for Military activities and FED-STD-123 for civil agencies. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
48、,-,-MIL-C-24723 l 6. NOTES (This section contain information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. 6.1.1 Nickel-copper alloy composition M-30C is a weldable alloy intended for use in parts requiring moderate strength, high ductility and high
49、 resistance to corrosion. 6.1.2 Nickel-copper-silicon alloy, composition M-30H is intended for applications involving nongalling and antiseizing characteristics coupled with noderately high hardness, high strength and relative ease of machinability. Weldability is poor. 6.1.3 Nickel-copper-silicon alloy, composition “25s is intended for use where nongalling and antiseizing characteristics combined with high hardness, and good corrosion and
