1、MIL-T-247bb FO m 9799906 0530590 5 = INCH-POUND MIL-T-24766 2 March 1992 MILITARY SPECIFICATION TITANIUM FORGINGS AND FORGINGS STOCK, HIGH QUALITY FOR SHIPS SERVICE This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 ScoDe. This specifica
2、tion covers commercially pure titanium forgings and forging stock for use in potential mission or life threatening applications involving exposure to seawater. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications. standards, and handbooks. The following specifica- tions, standards
3、and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2).
4、SPECIFICATIONS MILITARY MIL-H-81200 - Heat Treatment of Titanium and Titanium Alloys. 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 o
5、f 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 FORG DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. . Provided by IHSNot
6、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-243bb FO I 9999906 0530593 7 MIL-T-24766 STANDARDS MI LI TARY MIL-STD-163 - Steel Mill Products Prepared for Shipment and MIL-STD-271 - Requirements for Nondestructive Testing Methods. MIL-STD-792 - Identification
7、Marking Requirements for Special MIL-STD-2154 - Inspection, Ultrasonic, Wrought Metals, Processing Storage. Purpose Components. for. (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg,
8、 4D, 700 Robbinc Avenue, Philadelphia, PA 19111-5094.) 2.2 Non-Government publications. The following document(s) form a part of this document 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 cit
9、ed in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) E 8 - Standard Methods of Tension Testing of Metallic Materials. E 29 - Standard
10、 Practice for Using Significant Digits in Test (DoD adopted) Data to Determine Conformance with Specifications. (DoD adopted) Titanium Alloys. (DoD adopted) (DoD adopted) E 120 - Standard Method for Chemical Analysis of Titanium and E 340 - Standard Test Method for Macroetching Metals and Alloys. (A
11、pplication for copies should be addressed 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
12、 available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein (except for related associated detail specifications, specifications, specification sheets or MS standards), the
13、text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption 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 accor
14、dance with 4.3. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-247bb FO 99999Ob 0530592 9 W MIL-T-24766 3.1.1 No change shall be made to the forging procedure used for first article sample (see 6.4). 3.2 Materials and manufacture. Forging st
15、ock used to make forgings that meet this specification shall be electron beam melted or shall be multiple melted with at least one of the melting cycles under vacuum. first melt shall be by consumable electrode, nonconsumable electrode, electron beam, or plasma melting practice. The subsequent melt
16、or melts shall be made using consumable electrode practice. When multiple melted, the 3.2.1 Atmosphere. The atmosphere for nonconsumable electrode melting shall be vacuum or inert gas at a pressure not higher than 250 millimeters (mm) of mercury, 3.2.2 Electrode tip. The electrode tip for nonconsuma
17、ble electrode melting shall be water cooled copper. 3.3 Recovered materials. All material incorporated in the forgings covered by this specification shall be produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials! mean
18、s materials which have been collected or 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. 3.4 Chemical composition. The chemical composition shall be in accordance with table I (se
19、e 6.3). Check analysis tolerances shall be as shown in table I. TABLE I. Chemical composition requirements. Element Composition All values are maximums Ni trogen Carbon Hydrogen Iron Oxygen Residuals, each Residuals, total Tit anium 0.05 0.10 O. 0125 0.20 0.26 0.1 0.4 remainder Variation in product
20、analysis 0.02 0.02 0.10 0.02 0.0020 (20 ppm) L/ - - _- - i/ Parts per million, 3.5 Mechanical properties. 3.5.1 Forginas. Mechanical properties shall be in accordance with table II (see 6.3). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-24
21、766 FO m 9999906 0530593 O I MIL-T-24766 TABLE II. Mechanical property requirements. Property I Requirement I Tensile strength, L/ Ksi 2/ (MPa), min 65 (450) Yield strength, Ksi (MPa), min 55 (380) (At 0.2 percent offset) Elongation, percent, min 18 Red of area, percent, min 30 i/ Kilopounds per squ
22、are inch. 2/ Megapascal, 3.5.2 ForPinP; stock. When a sample of stock is forged to a test coupon and heat treated as specified in 3.7 or the stock is tested after heat treatment per 3.7 the mechanical properties shall meet those of table II. 3.6 Heat treatment. Forgings shall be furnished in the ann
23、ealed condition. Annealing shall be by heating to an aim temperature of 1300 degrees Fahrenheit (OF) (705 degrees Celsius (OC), holding at temperature for not less than 1 hour. Long term annealing shall not be performed to reduce mechanical properties. Only air cooling shall be permitted following a
24、nnealing. Furnace surveys and calibra- tion of temperature recorders and controllers shall be in accordance with MIL-H-81200. 3.7 Dimensions. The shape and dimensions, including tolerances, of the finished forging shall be as specified (see 6.2). Forging stock dimensions and tolerances shall be as s
25、pecified (see 6.2). Sufficient intermediate shapes and dimensions shall be provided to identify test specimen location and inspection orientation (see 6.3). 3.8 Soundness. Material shall be of uniform quality and condition and free of injurious defects harmful to its intended use, such as pipe, sliv
26、ers, cracks, laps, laminations, seams, burrs, buckles, fins, porosity. Limits of acceptability shall be as specified (see 4.5.4.2 and 4.5.5). 3.9 Marking. 3.9.1 Individual forgings shall be marked with the following: (a) Producers name or trademark. (b) Specification number. (c) Part number or forgi
27、ng drawing number. (d) Lot number. 3.9.2 The method and location of marking shall be in accordance with MIL-STD-792. vibroetching , Forging stock may be marked with low stress die stamps or 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-247b
28、b FO 9999906 0530594 2 = MIL-T-24766 3.10 Cleanliness. 3.10.1 Contaminants. Forgings shall be free of foreign material and contaminants, such as sulfur, lead, marking paints or machining or forming lubricants. Forgings shall be cleaned prior to any heat treatment operations. 3.10.2 Mercury. During t
29、he manufacturing processes, examinations, and tests the material shall not come into direct contact with mercury or any of its compounds, nor with any mercury containing device employing a single boundary of containment. 3.10.3 Oxides. Forgings shall be free of any oxygen rich layer, such as alpha c
30、ase. 3.11 Repair welds. No repair welding shall be permitted. 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 (examinations and tests) as
31、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 requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform a
32、ny 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 Responsibilitv for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this speci
33、fication 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 of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance co
34、mply 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 does not authorize submission of known defective material, either indicated or actual, nor does it commit the Go
35、vernment to accept defective material, 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: (a) First article inspection (see 4.3). (b) Quality conformance inspection (see 4.4). 4.3 First article inspection. First article inspection shall consist
36、 of the examinations and tests specified in 4.3.2 through 4.3.3.1 and the quality confor- mance tests and examinations of 4.4 (see 6.3 and 6.4). 4.3.1 Sampling for first article inspection. The first forging of a given design submitted for inspection shall be the first article sample. 5 Provided by
37、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-T-24766 FO II 9999906 0530595 4 MIL-T-24766 4.3.2 Mechanical property tests. Mechanical properties for first article inspections shall be determined throughout the forging as specified (see 6.2) and shall meet
38、 the requirements as agreed upon between the Command or agency concerned and be compared to test values. obtained from test bars of 4.4.2.2.3. 4.3.3 Macroscopic examination. A full cross-section shall be macroetched and examined for uniformity, soundness, grain size and grain flow. 4.3.3.1 Acceptanc
39、e criteria. The macroetch cross-section shall evidence uniformity of quality, soundness and freedom from cracks and porosity. A fully wrought structure shall be evident. will not interfere with ultrasonic examination. Flow lines shall not cross any pressure boundaries. Variation in grain size shall
40、be such that it 4.4 Quality conformance inspection. 4.4.1 Lot definition. Each forging over 125 pounds (57 kilogram (kg) shall constitute a lot. For forgings up to and including 125 pounds (57 kg), a lot shall constitute all forgings from the same heat, of the same design and size and heat treated i
41、n the same heat treat furnace load. 4.4.2 Sampling. 4.4.2.1 Chemical analvsis. One sample shall be taken from each heat except that for hydrogen determinations one sample shall be taken from each lot after thermal and chemical processing is completed. 4.4.2.2 Mechanical Droperty. 4.4.2.2.1 Forgings
42、UR to 125 pounds (57 kg)% as shipped. Two tensile speci- mens shall be taken from each lot. 4.4.2.2.2 Forgings over 125 pounds (57 kg), as shipped. Two tensile speci- mens shall be taken from each forging. 4.4.2.2.3 Source of specimens. The test specimens shall be taken from integral prolongations o
43、r extra forgings may be provided by the forger. under 3-1/2 inches (90 mm) in cross-section may use separately forged test bars, provided the wall thickness and amount of working are equivalent to the forgings being supplied, 3-1/2 inches (90 mm) in cross-section, provided samples cannot be taken fr
44、om pro- longations or by trepanning. having the largest cross-section. Forgings Extra forgings may be provided for samples when forgings are over Samples shall be taken from the section of forging 4.4.2.3 Nondestructive tests. Each forging shall be liquid penetrant inspected over 100 percent of its
45、surface unless otherwise specified (see 6.2 and 6.3). volume unless otherwise specified (see 6.2 and 6.3). Each forging shall be ultrasonically inspected over 100 percent of its 4.4.2.4 Visual and dimensional examinations. 4.4.2.4.1 Forgings - weighing - 125 pounds and less. Samples shall be selecte
46、d in accordance with table III. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3 . MIL-T-24766 FO U 777770b 0510576 b W MIL-T-24766 TABLE III. Sampling plan for visual and dimensional inspections. I Lot size I Sample size 2-3 4 - 25 26 - 50 51 - 9
47、0 91 - 150 151 - 280 281 - 500 501 - 1200 Al 1 3 5 6 7 10 11 15 4.4.2.4.2 Forgings - weighing - over 125 pounds. Each forging shall be visually and dimensionally examined. 4.5 Test methods. 4.5.1 Chemical analysis. The sample selected in 4.4.2.1 shall be analyzed by the wet chemical or spectrographi
48、c methods to determine conformance with table I. In the case of dispute, analysis shall be in accordance with ASTM E 120, 4.5.2 Mechanical properties. Mechanical property tests shall be performed in accordance with ASTM E 8. Unless otherwise specified (see 6.2), the longitudi- nal axis of tensile sp
49、ecimens shall be parallel to the major direction of metal flow in the forgings. 4.5.3 Macroscopic examination. Specimens selected in accordance with 4.3.3 shall be prepared for examination as stated in ASTM E 340 and examined at up to lox magnification. Acceptance criteria shall be as specified in 4.3.3.1. 4.5.4 Ultrasonic inspection. Forgings shall be ultrasonically inspected in accordance with MIL-STD-2154 throughout 100 percent of their volume. shall be per
