1、“ I- MILITARY SPECIFICATION IINCH-POUNDI MIL-C-24615A(SH) 14 October 1988 SUPERSEDING 15 December 1982 (See 6.6) MIL-C-24615(SH) CASTINGS, NICKEL-CHROMIU“MOLYBDENU“COLUMB1UM ALLOY This specification is approved for use within the Naval Sea Systems Command, Department of the Navy, and is available fo
2、r use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers nickel-chromium-molybdenum-columbium (Ni-Cr-Mo-Cb) (UNS N06625) alloy castings for corrosion-resistant service. 1.2 Classification. The alloy castings are classified as the following gra
3、des (see 6.2.1): Grade A - Air melt processed. Grade B - Argon oxygen decarburization process 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards, The following specifications and standards form a part of this specification to the extent specified herein. Unless othe
4、rwise 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 solicitation. SPECIFICATIONS MILITARY MIL-E-22200 - Electrodes, Welding, Covered; General Specification f
5、or. MIL-E-22200/3 - Electrodes, Welding, Covered: Nickel Base Alloy; and Cobalt Base Alloy. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Depart
6、ment 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. / . THIS DOCUMENT CONTAINS (J PAGES. MSC N/A AREA MECA DISTRIBUTION STATEMENT A Approved for public release; distri
7、bution unlimited Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STANDARDS FEDERAL FED-STD-151 - Metals; Test Methods. MILITARY MIL-STD-163 - Steel Mill Products, Preparation for Shipment and MIL-STD-271 - Requirements for Nondestructive Testing Meth
8、ods. MIL-STD-278 - Welding and Casting Standard. MIL-STD-792 - Identification Marking Requirements for Special Storage. Purpose Components. (Copies of specifications and standards required by contractors in connec- tion with specific acquisition functions should be obtained from the contracting acti
9、vity or as directed by the contracting activity,) 2.2 Other oublications. The following documents form 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 DoDISS specified
10、 in the solicitation, Unless otherwise specified, the issues of documents not listed in the DoDISS shall be the issue of the nongovern- ment documents which is current on the date of the solicitation. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) E 3 - Standard Methods of Preparation of Metallog
11、raphic E 8 - Standard Methods of Tension Testing of Metallic Materials. E 38 - Standard Methods for Chemical Analysis of Nickel-Chromium E 883 - Standard Guide for Metallographic Photomicrography. Specimens. (DoD adopted) (DoD adopted) and Nickel-Chromium-Iron Alloys. (Application for copies should
12、be addressed to American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Nongovernment standards and other publications are normally available from the organizations which prepare or which distribute the documents. These documents also may be available in or through li
13、braries or other informational services. ) 2.3 Order of arecedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specifi- cation shall take prece
14、dence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained, 3. REQUIREMENTS 3.1 First article. When specified in the contract or purchase order, a sample shall be subjected to first article inspection (see 4.3, 6.2.1,
15、and 6.3). 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-O 3.1.1 The casting method used for first article sample shall not be changed without specific approval of the Command or agency concerned. Additional first article tests and examinations ma
16、y be required to verify that any changes will not degrade casting quality. 3.2 Recovered materials. Unless otherwise specified herein, all material in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent
17、 practicable without jeopardizing the intended use. The term “recovered materialsl means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materiels. None of the above shall be interpreted to mean that the
18、use of used or rebuilt products is allowed under this specification unless otherwise specifically specified. 3.3 Manufacture. Grade A alloy shall be made by an electric furnace process. Grade B alloy shall be made by a combination of electric furnace and argon-oxygen decarburization (AOD) process. W
19、hen approved by the Command or agency concerned, other refining processes such as electroslag remelt or vacuum arc remelt may be used. Static or centrifugal castings may be supplied at the option of the contractor unless a specific type is specified (see 6.2.1). 3.4 Internal chills and chaplets. Chi
20、lls and chaplets shall not be allowed to remain in the casting except by authorization of the Command or agency concerned (see 6.4.2). When either chaplets or internal chills are used, they shall be of the composition specified in 3.5 or of comparable wrought material. 3.5 Chemical comDosition. The
21、material shall conform to the chemical composition specified in table I. TABLE I. Chemical composition. Element Carbon, maximum Manganese, maximum Silicon, maximum Phosphorus, maximum Sulphur, maximum Chromium Molybdenum Iron, maximum Columbium and tantalum Aluminum, maximum Titanium, maximum Nickel
22、 Air melt (percent) Grade A I AOD melt (percent) Grade B 0.06 1. O0 0.50 O. 015 O. 015 20.0 - 23.0 8.0 - 10.0 5.00 3.15 - 4.50 0.15 0.10 Balance 0.02 1.00 0.25 O. 015 o. 010 20.0 - 23.0 8.0 - 100 5 .O0 3.15 - 4.50 0.15 0.10 Balance 3 Provided by IHSNot for ResaleNo reproduction or networking permitt
23、ed without license from IHS-,-,-3.6 Heat treatment, Castings and representative test coupons shall be annealed at 2100-2200 degrees Fah.renheit (“F). fo-r 1 hour per inch of thickness (2 hours minimum) at temperature followed by air cooling or water quenching. O Test coupons shall be heat treated (s
24、ee 6.4.1) in the same furnace batch as the castings they represent. 3-7 Mechanical properties. The material shall conform to the mechanical: properties 0% table XI. TABLE II. Mechanical properties. Grade A Grade E Tensile strength, pounds. per square Yield strength (0.2 percent offset), Elong-ation,
25、 percent in 4 times Reduction of area, percent, minimum inch (lb/in2), mBn2mum lb/in2 minfmum d5amete.r ,. minlmum 70,000 40,000 20 20- 70,000 40,000 30 30 3.8 Metallographic examination. men specified (see 6.2.1), metallographic examination shall be performed on a mechanical p.roperty test sample.
26、3.9 Weldability. When specified (see 6.2.1), a weldability test in accordance with 4.5.4 shall be performed and meet the specified requirements. 3.10 Internal soundness, Unless otherwise specified (see 6.2.1), each production casting shall be radiographed for conformance wth MIL-STD-278 or other sta
27、ndard as specifled (see 6.2.1). 3.11 Pressure-boundary castings. Unless otherwise specified (see 6.2.1), each pressure boundary casting shall be hydrostatically tested in accordance with MIL-STD-278 or other standards as specified (see 6.2.1). 3.12 Surface defects. 3.12.1 Visual defects. Casting sur
28、faces shall be free of shrinkage, cracks, tears, cold shuts, and mold material inclusions which are visible to the unaided eye. Visual surface porosity which exceeds the acceptance criteria specified in 4.5.6.1 shall not be permitted. 3.12.2 Licruid penetrant defects. All casting surfaces shall meet
29、 the acceptance criteria specified in MIL-STD-278 or as specified (see 6.2.1). 3.13 Weld repair. Defects in castings shall be removed, or removed and repaired by welding in accordance with MIL-STD-278. Sealing of pressure con- taining castings by peening, plugging, or impregnation of castings is pro
30、hibited. Weld repairs shall be performed after annealing in accordance with 3.6. When 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-O specified (see 6.2.1), reanneal is required after performing special (major) weld repairs in designated critical
31、 areas (see 6.2.1). Weld repairs shall not be performed until the heat has passed the weldability test of 4.5.4. 3.14 Finish and dimensions. 3.14.1 Finish. All surfaces of castings shall be clean and suitable for performance of specified nondestructive examinations. Cleaning may be accomplished by b
32、lasting with clean mineral grit or metallic, corrosion-resisting shot, or by grinding and buffing using grinding wheels that have not been used on steels or copper-base alloys. 3.14.2 Dimensions. 3.14.2.1 The foundry shall be responsible for the dimensional accuracy of the castings as related to the
33、 drawing when the pattern equipment is produced by the foundry. 3.14.2.2 When the pattern equipment is provided by the contractor, the foundry shall be responsible for the dimensional accuracy of the castings as related to the provided pattern equipment. 3.14.2.3 Where thick and thin sections of the
34、 castings join, the manufac- turer shall be permitted to add (where not previously provided) fillets of adequate size, subject to approval by the Command or agency. 3.15 Marking. Each casting shall be marked with the following information in a permanent fashion as specified in 3.15.1 and 3.15.2: (a)
35、 Heat and lot number. (b) Pattern or drawing number (static castings only). (c) Specification number and material grade (see 1.2). (d) Material identity mark (UNS N06625). (e) Foundry identification (manufacturers trademark, and so forth). (f) Additional information as specified on the casting drawi
36、ng. 3.15.1 Location of markinq. Marking shall be located in accordance With the casting drawing. 3.15.2 Method of markinq. Marking shall be cast in raised letters, or shall be done on an integrally-cast pad, or a combination of the two, or shall be done on a cast, or machined surface when so specifi
37、ed on the casting drawing. Method of marking shall be as follows: (a) Cast raised letters. Cast raised letters shall be in accordance with the casting drawing. (b) Marking - on integrally-cast - pad. Marking shall be in accordance with MIL-STD-792 using low stress die stamps, a vibrating marking too
38、l (vibro-tool), electrochemical etching, or laser engraving methods. MIL-STD-792 using a vibrating marking tool (vibro-tool), electrochemical etching, or laser engraving methods. (c) Marking - on casting surface. Marking shall be in accordance with 5 Provided by IHSNot for ResaleNo reproduction or n
39、etworking permitted without license from IHS-,-,-4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein, Except as otherwise
40、specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the
41、 specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Responsibilitv for compliance. All items must meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the cont
42、ractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contra
43、ct, Sampling in quality conformance does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material. 4.1.2 Inspection svstem. When specified in the contract or order, an inspection system program plan shall
44、be prepared (see 6.2.2). 4.1.3 Certification data/report. When specified in the contract or order, a certification data/report shall be prepared (see 6.2.2). 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: (a) First article inspection (see 4
45、.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 4.3.1 through 4.3.4. 4.3.1 Samplinp. for first article inspection. The first casting of a given design submitted for inspection shall
46、be the first article sample. 4.3.2 Radiographic - inspection. The first article casting shall be radiographically inspected in accordance with MIL-STD-271 to the acceptance criteria specified in MIL-STD-278 of the criticality level specified (see 6.2.1). 4.3.3 Liaud penetrant inspection. The first a
47、rticle casting shall be liquid penetrant inspected in accordance with MIL-STD-271. Unless otherwise specified (see 6.2.1), the acceptance criteria shall be as specified in MIL-STD-278. 4.3.4 Mechanical property test. Mechanical properties shall be determined on critical areas of the casting as speci
48、fied (see 6.2.1) and shall meet require- ments as agreed upon between the Command or agency concerned and the contractor. Test bar mechanical properties shall also be determined. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.3.5 First article t
49、est report. When specified in the contract or order, a first article test report shall be prepared (see 6.2.2). 4.4 Quality conformance inspection. 4.4.1 Sampling for auality conformance inspection. 4.4.2 Lot definition. 4.4.2.1 Chemical analysis. A lot shall consist of castings made from the same heat (see 6.4.1). 4.4.2.2 Mechanical properties. A lot shall consist of castings from the- same heat and the same heat treatment batch, 4.4.2.3 Weldability tes
