1、MILITARY SPECIFICATION 1 METRIC 1 DOD-F-24669 7 Julv 1986 SUPERSEDING (See 6.3) FORGINGS AND FORGING STOCK, STEEL BARS, BILLETS AND BLOOMS, GENERAL SPECIFICATION FOR (METRIC) This specification is approved for use by all Departments and Agencies of the Department of Defense. l. SCOPE 1.1 Scope. This
2、 specification covers the general requirements for carbon steel, alloy steel and stainless steel bars, forgings and reforging stock. 1.2 Classification. Bars, forgings and forging stock shall be furnished in the type, class, grade, condition, alloy or finish specified in the detailed specification (
3、see 3.1 and 6.2.1). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and stan- dards form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in
4、the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation. SPECIFICATIONS (See supplement l.for list of associated specifications) STANDARDS FEDERAL FED-STD-183 - Continuous Identification Marking of Iron and Steel Product
5、s. I 1 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, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardizati
6、on Docunent Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-F-24669 MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection By MIL-STD-163 - Stee
7、l Mill Products Preparation for Shipment and MIL-STD-248 - Welding and Brazing Procedure and Performance MIL-STD-271 - Nondestructive Testing Requirements for Metals. MIL-STD-278 - Fabrication Welding and Inspection; and Casting Inspection and Repair for Machinery, Piping and Pressure Vessels in Shi
8、ps of the United States Navy MIL-STD-792 - Identification Marking Requirements for Special Purpose Components. Attributes. Storage. Qualification. (Copies of specifications and standards required by contractors in connec- tion with specific acquisition functions should be obtained from the contracti
9、ng activity or as directed by the contracting activity.) 2.2 Other publications. The following documents form a part of this speci- fication 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
10、specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS shall be the issue of the nongovernment docu- ments which is current on the date of the solicitation. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A 29 - Standard Specifications for Steel
11、 Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished, General Requirements for. (DoD adopted) of Steel Products. (DoD adopted) Analysis of Steel Products, Methods, Practice and Definitions for. A 788 - Standard Specification for Steel Forgings, General Requirements. (DoD adopted) E 112 - Standard
12、Methods for Determining Average Grain Size. (DoD adopted) E 381 - Standard Method of Macroetch Testing, Inspection, and Rating Steel Products, Comprising Bars, Billets, Blooms, and Forgings. (DoD adopted) A 370 - Standard Methods and Definitions for Mechanical Testing A 751 - Standard Methods, Pract
13、ices, and Definitions for Chemical (Application for copies should be addressed to the 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
14、 the documents. These documents also may be available in or through libraries or other informational services.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. 2.3 Order of precedence. In the event of a conflict between the text of this specifica
15、tion and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specifi- cation shall take precedence. Nothing in this specification, however, shall . supersede applicable laws and regulations unless a specific exemption has
16、been obtained. 3. REQUIREMENTS 3.1 Detail specifications. The individual item requirements shall be as specified herein and in accordance with the applicable detail specification. In the event of any conflict between the requirements of this specification and the detail specifications, the latter sh
17、all govern. 3.2 Material. Unless otherwise specified in the detail specification, the steel shall be produced by any of the following primary processes: open hearth, basic oxygen, electric furnace or vacuum induction (VIM). Stainless steel grades shall be produced by electric furnace or VIM only. Th
18、e primary melting may incor- porate separate degassing or refining and may be followed by secondary melting using electroslag remelting (ESR) or vacuum arc remelting (VAR). The material shall be made using fine grain practice. The molten steel may be vacuum treated prior to or during pouring. Steel
19、may be cast into ingots or continuous cast into billets. 3.2.1 Reduction from cast structure. Cast billets or ingots shall be processed by hot working so that the cross section of the finished forgings is reduced to at least one-third the cross section of the as-cast material. Flanges and other enla
20、rgements on forgings need not be reduced to this ratio, but shall be reduced in a ratio of not less than 1.7 to 1. Where an upsetting operation is employed or expanding on a mandrel, no fixed ratio between the as-cast cross- sectional area and that of the forging is required. All material supplied s
21、hall be wrought. 3.2.2 Discard. Sufficient discard shall be made to secure freedom from piping and undue segregation. 3.2.3 Stability. Material shall be furnished in a condition to withstand, for an indefinite time, exposure to all climatic conditions without developing any external or internal crac
22、ks. The method of cooling or of treatment before shipment shall be optional with the manufacturer, but he shall be responsible (in the same manner as for defects disclosed after delivery) for cracks that may develop before material is subjected to reheating. 3.2.4 Recovered materials. Unless otherwi
23、se specified herein, all material incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials“ means materials wh
24、ich have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically spe
25、cified. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-F-24669 I 3.3 Grain size. The grain size shall be considered fine when the structure falls within photograph numbers 5 to 8, inclusive, of ASTM E 112. The grain structure shall be consider
26、ed satisfactory if 70 percent is within the specified grain size limits. The grain size requirements also apply to material over 645 square centimeters (100 square inches) in cross-sectional area. 3.4 Heat treatment. Unless otherwise specified (see 6.2.1), heat treatment shall be as specified in the
27、 detail specification. 3.4.1 Heat treat equipment and controls. Continuous or automatic heat treating equipment may be employed, provided it produces heat treated material to meet the requirements of this specification. For the particular loading and size range of the pieces being heat treated, the
28、temperature recording equipment shall be proven to correlate with actual temperature of the material and shall be main- tained and calibrated on a regular basis. The temperature of the furnace charge shall be recorded during the heating, holding and when applicable the cooling cycles of the heat tre
29、atment. Recording is not applicable to cooling cycles involving air or liquid cooling. After the charge reaches the selected tempera- ture control setting, furnaces shall maintain the temperature of the heating medium and any point in the furnace charge within plus or minus 14 degrees Celsius (C“) (
30、25 degrees Fahrenheit (OF). 3.5 Soundness. Material shall be of uniform quality and condition, free of defects harmful to its intended use, such as seams, pipe, cracks, excessive scale, fins, porosity, and segregation as determined by visual examination and the non- destructive tests, such as ultras
31、onic, magnetic particle, or dye penetrant inspection. 3.5.1 Nondestructive requirement method and acceptance criteria shall be as specified (see 6.2.1). 3.5.2 Surface conditioning of billets, blooms and slabs. Material may be conditioned to remove injurious surface defects provided the depth of cond
32、i- tioning does not exceed 1.6 millimeters (mm) (1/16 inch) for each 2 centimeters (inch) of dimension concerned up to a maximum depth of 19 mm (3/4 inch), and provided that the width of th.e conditioning is at least four times its greatest depth; except that in the case of slabs where the width is
33、at least twice the thickness, the depth of conditioning on the wide surfaces may exceed this allow- ance by 50 percent up to a maximum depth of 19 mm. The maximum depth of conditioning on two parallel sides at opposite locations shall not exceed one and one-half times the maximum allowed for one sid
34、e. Conditioned areas shall be flared to result in a uniform blending. 3.5.3 Macrostructure. The macrostructure shall be determined on all billets, slabs, bars and forgings. Deep acid etched blooms, billets and forgings up to and including 232 square centimeters (36 square inches) shall be equal to o
35、r better than S-3, R-2, and C-3 plates of ASTM E 381. Sizes over 232 square centimeters and including 645 square centimeters (100 square inches) shall be equal to or better than S-3, R-3 and C-3. For sizes in excess of 645 square centimeters, macrostructure requirements shall be as specified (see 6.
36、2.1). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-F-24669 , 3.6 Repair of defects. 3.6.1 Repair welding is not permitted unless specifically approved by the Command or agency concerned or its authorized representative. 3.6.1.1 Weld repair s
37、hall be performed in accordance with MIL-STD-278. Welding procedure qualification, prior to production welding, shall be in accordance with MIL-STD-248. 3.6.2 Defects may be ground or chipped out provided the defective area is faired into the surrounding area and dimensional tolerances are not viola
38、ted. 3.7 Dimensions and tolerances. 3.7.1 Bars. Dimensions shall be as specified in the detail specification. Tolerance requirements shall be as required by ASTM A 29. 3.7.2 Forgings. Forgings shall conform to the dimensions, tolerances and finish specified on the applicable drawing. Forgings shdl b
39、e furnished that can be machined to the finished dimensions within the tolerances given on the appli- cable drawing. Layout points, when required, shall be as shown on the applicable drawings and shall be marked on the forgings. 3.7.3 Reforging stock. Billets, bars, blooms, and slabs shall conform t
40、o the form and dimensions as specified (see 6.2.1). 3.7.3.1 Weight tolerances. The permissible variation from the specified or theoretical weight of blooms, billets and slabs shall be plus or minus 5 percent for individual pieces, or lots less than a carload. For carload lots the permis- sible varia
41、tion shall be plus or minus 2.5 percent of the total weight of the lot. 3.8 Forging drawing. When specified (see 6.2.1), a drawing shall be pre- pared in accordance with the data ordering document included in the contract or order (see 6.2.2) for approval by the Command or agency concerned, showing
42、the shape of the as-forged forging and the principle steps in the forging process in sufficient detail to determine the direction of metal flow. The drawing shall also show the locations from which the test specimens are to be taken, the loca- tion of any marking specified, the dimension of the forg
43、ing at time of ultrasonic inspection and a superimposed outline of the finished part. 3.9 Identification marking. Each item shall be marked with the following information : (a) Manufacturers name or symbol. (b) Material specification number. (c) The class, grade, alloy, finish, condition, type, (d)
44、Manufacturers identification or heat number. as appropriate. 3.9.1 Marking method. Bars and reforging stock shall be continuously marked in accordance with FED-STD-183. Forgings shall be marked with a permanent method in accordance with MIL-STD-792. 5 Provided by IHSNot for ResaleNo reproduction or
45、networking permitted without license from IHS-,-,-DOD-F-24669 I 3.9.2 When forgings are of a size that individual marking is not required in accordance with FED-STD-183, forgings of the same heat number, size and configuration may be wired together or otherwise segregated, and a metal tag attached c
46、ontaining the information required by 3.8. 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 specif
47、ied 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 speci
48、fication where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Responsibility 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 contractor
49、s overall inspection system or quality progrom. 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 contract. 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.
