1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS7819D AEROSPACE MATERIAL SPECIFICATION AMS7819 REV. D Issued 1964-01 Revised 2
5、009-07 Reaffirmed 2013-10 Superseding AMS7819C Molybdenum Alloy Bars 0.48Ti - 0.09Zr - 0.02C Arc Cast, Stress Relieved (Composition similar to UNS R03640) RATIONALE AMS7819D has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE 1.1 Form This specification covers an arc-cast mo
6、lybdenum alloy in the form of round bars. 1.2 Application These bars have been used typically for parts requiring high modulus and uniform strength up to 2300 F (1260 C) but usage is not limited to such applications. This alloy is not recommended for use in oxidizing atmospheres above 1000 F (540 C)
7、 unless protected by a suitable coating. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document
8、 issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. 2.1 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,
9、 Tel: 610-832-9585, www.astm.org. ASTM E 8 / E 8M Tension Testing of Metallic Materials ASTM E 92 Vickers Hardness of Metallic Materials ASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron 2.2 ASME Publications Available from ASME, 22
10、 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org. ASME B46.1 Surface Texture, Surface Roughness, Waviness, and Lay SAE INTERNATIONAL AMS7819D Page 2 of 6 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1; carbon
11、shall be determined in accordance with ASTM E 350, molybdenum by difference, gaseous elements by vacuum fusion, and other metallic elements by spectrographic or other analytical methods acceptable to the purchaser: TABLE 1 - COMPOSITION Element min max Check Analysis Under Min or Over Max Molybdenum
12、 99.25 - - - Titanium 0.40 0.55 0.05 0.05 (500 ppm) Zirconium 0.06 0.12 0.02 0.02 (200 ppm) Carbon 0.010 0.030 0.005 0.005 ( 50 ppm) Iron - 0.020 - 0.002 ( 20 ppm) Silicon - 0.010 - 0.002 ( 20 ppm) Nickel - 0.010 - 0.001 ( 10 ppm) Oxygen - 0.030 (300 ppm) - - Nitrogen - 0.010 (100 ppm) - 0.0005 ( 5
13、ppm) Hydrogen - 0.0005 ( 5 ppm) - - 3.2 Melting Practice Alloy shall be carbon deoxidized and vacuum arc melted using consumable electrode practice. 3.3 Condition Hot-cold worked, descaled, and stress-relieved; when so specified, bars shall be centerless ground before being stress-relieved. The surf
14、ace texture of centerless ground bars shall be 90 microinches (2.3 m) or smoother, determined in accordance with ASME B46.1. 3.4 Properties Bars 0.125 to 4.500 inches (3.00 to 112.50 mm) inclusive, in nominal diameter shall conform to the following requirements: 3.4.1 As-Received 3.4.1.1 Tensile Pro
15、perties Shall be as specified in Table 2, determined in accordance with ASTM E 8 / E 8M with the rate of strain maintained at 0.002 to 0.005 inches/inch per minute (0.002 to 0.005 mm/mm per minute) through the 0.6% offset and 0.002 to 0.05 inches/inch per minute (0.002 to 0.05 mm/mm per minute) abov
16、e the 0.6% offset to fracture. TABLE 2A - TOLERANCES, HOT-COLD WORKED, INCH/POUND UNITS Nominal Diameter Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 4D % 0.125 to 0.875, incl 115 100 18 Over 0.875 to 1.875, incl 100 85 10 Over 1.875 to 2.875, incl 90 80 10 Over 2.875
17、to 3.500, incl 85 75 5 Over 3.500 to 4.500, incl 80 70 5 SAE INTERNATIONAL AMS7819D Page 3 of 6 TABLE 2B - TOLERANCES, HOT-COLD WORKED, SI UNITS Nominal Diameter Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 4D % 3.00 to 22.00, incl 795 690 18 Over 22.00 to 47.00,
18、incl 690 585 10 Over 47.00 to 72.00, incl 620 550 10 Over 72.00 to 87.50, incl 585 515 5 Over 87.50 to 112.50, incl 550 485 5 3.4.1.2 Hardness Shall be shown in Table 3, determined in accordance with ASTM E 92. TABLE 3 - MAXIMUM HARDNESS Nominal Diameter Inch Nominal Diameter Millimeters Maximum Har
19、dnessHV10 0.125 to 0.875, incl 3.00 to 22.00, incl 320 Over 0.875 to 1.125, incl Over 22.00 to 28.00, incl 310 Over 1.125 to 1.875, incl Over 28.00 to 47.00, incl 300 Over 1.875 to 2.875, incl Over 47.00 to 72.00, incl 290 Over 2.875 to 3.500, incl Over 72.00 to 87.50, incl 285 Over 3.500 to 4.500,
20、incl Over 87.50 to 112.50, incl 280 3.4.2 After High-Temperature Exposure Bars shall meet the tensile property (3.4.1.1) and hardness (3.4.1.2) requirements after being heated in a suitable protective atmosphere to 2100 F 25 (1150 C 15), held at heat for 30 minutes 3, and cooled rapidly. 3.5 Quality
21、 Bars, as received by purchaser, shall be uniform in quality and condition, sound, smooth, and free from foreign materials and from imperfections detrimental to usage of the bars. 3.6 Tolerances Shall be as follows: 3.6.1 Hot-Cold Worked and Descaled Shall be shown in Table 4. SAE INTERNATIONAL AMS7
22、819D Page 4 of 6 TABLE 4A - TOLERANCES, HOT WORKED, INCH/POUND UNITS Nominal Diameter Inches Tolerance Inch Plus Tolerance Inch Minus Out of Round Inch 0.125 to 0.281, incl 0.002 0.002 0.004 Over 0.281 to 0.406, incl 0.003 0.003 0.006 Over 0.406 to 0.625, incl 0.010 0.005 0.012 Over 0.625 to 0.875,
23、incl 0.015 0.005 0.015 Over 0.875 to 1.000, incl 0.020 0.005 0.015 Over 1.000 to 1.375, incl 0.020 0.010 0.018 Over 1.375 to 1.500, incl 0.020 0.015 0.020 Over 1.500 to 1.625, incl 0.025 0.015 0.020 Over 1.625 to 2.000, incl 0.030 0.020 0.025 Over 2.000 to 2.500, incl 0.032 0.032 0.025 Over 2.500 to
24、 3.250, incl 0.032 0.032 0.027 Over 3.250 to 3.500, incl 0.045 0.045 0.040 Over 3.500 to 4.500, incl 0.062 0.062 0.050 TABLE 4B - TOLERANCES, HOT WORKED, SI UNITS Nominal Diameter Millimeters Tolerance Millimeters Plus Tolerance Millimeters Minus Out of Round Millimeters 3.00 to 7.00, incl 0.05 0.05
25、 0.10 Over 7.00 to 10.00, incl 0.08 0.08 0.15 Over 10.00 to 15.00, incl 0.25 0.12 0.30 Over 15.00 to 22.00, incl 0.38 0.12 0.38 Over 22.00 to 25.00, incl 0.50 0.12 0.38 Over 25.00 to 34.00, incl 0.50 0.25 0.45 Over 34.00 to 37.50, incl 0.50 0.38 0.50 Over 37.50 to 40.00, incl 0.62 0.38 0.50 Over 40.
26、00 to 50.00, incl 0.75 0.50 0.62 Over 50.00 to 62.50, incl 0.80 0.80 0.62 Over 62.50 to 81.00, incl 0.80 0.80 0.68 Over 81.00 to 87.50, incl 1.12 1.12 1.00 Over 87.50 to 112.50, incl 1.55 1.55 1.25 3.6.2 Centerless Ground Shall be shown in Table 5. TABLE 5 CENTERLESS GROUND TOLERANCES Nominal Thickn
27、ess Inches Nominal Thickness Millimeters Tolerance Plus and Minus Inch Tolerance Plus and Minus Millimeter 0.0625 to 2.000, incl 1.500 to 50.00, incl 0.002 0.05 Over 2.000 Over 50.00 to incl 0.003 0.08 SAE INTERNATIONAL AMS7819D Page 5 of 6 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Insp
28、ection The vendor of bars shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the bars conform to specified requirements. 4.2 Clas
29、sification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.4.1.1), hardness (3.4.1.2), and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Tests to determine conformance to requirements for tensile properti
30、es and hardness after high-temperature exposure (3.4.2) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling Shall be as follows; a lot shall be all bars of the same nominal size from the same heat, proces
31、sed at the same time, and presented for vendors inspection at one time: 4.3.1 Acceptance Tests 4.3.1.1 Composition One specimen from each heat. 4.3.1.2 Tensile and Hardness Tests One specimen from each lot. 4.3.1.2.1 Specimens for tensile testing shall be taken from the center of bars up to 1.125 in
32、ches (28.00 mm) in nominal diameter and at mid-radius of larger bars. 4.3.2 Periodic Tests As agreed upon by purchaser and vendor. 4.4 Reports 4.4.1 The vendor of bars shall furnish with each shipment a report showing the results of tests for composition of each heat and for tensile properties and h
33、ardness of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS7819D, size, and quantity. 4.5 Resampling and Retesting If any specimen used in the above tests fails to meet the specified re
34、quirements, disposition of the bars may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the bars represented and no additional testing shall be pe
35、rmitted. Results of all tests shall be reported. SAE INTERNATIONAL AMS7819D Page 6 of 6 5. PREPARATION FOR DELIVERY 5.1 Identification Bars shall be marked near one end with the purchase order number, AMS7819D, and nominal size. The characters shall be of such size as to be legible, shall be applied
36、 using a suitable marking fluid, and shall be removable in hot alkaline cleaning solution without rubbing. The markings shall have no deleterious effect on the bars or their performance and shall be sufficiently stable to withstand normal handling. As an alternate method, individual pieces or bundle
37、s shall have attached a durable tag marked with the above information or shall be boxed and the box marked with the same information. 5.2 Packaging 5.2.1 Bars shall be packaged in wooden boxes or other suitable protective containers of 1 ton (900 kg) maximum lifts to prevent damage to surfaces durin
38、g shipping and handling. 5.2.2 The product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the bars to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDG
39、MENT A vendor shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Bars not conforming to this specification or to modifications authorized by purchaser will be subject to rejection. 8. NOTES 8.1 A change bar (I) loca
40、ted in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revi
41、sions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.4 Purchase documents should specify not less than the following: AMS7819D Size of bars desired Quantity of bars desired. PREPARED BY AMS COMMITTEE “G”
