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 2012 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/AMS4842E AEROSPACE MATERIAL SPECIFICATION AMS4842 REV. E Issued 1941-09 Revised 2
5、004-04 Reaffirmed 2012-02 Superseding AMS4842D Castings, Leaded Bronze, Sand and Centrifugal 80Cu - 10Sn - 9.5Pb As Cast (Composition similar to UNS C93700) RATIONALE AMS4842E has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE: 1.1 Form: This specification covers a leaded b
6、ronze in the form of sand and centrifugal castings. 1.2 Application: These castings have been used typically for bearings requiring excellent anti-friction properties and resistance to corrosion but usage is not limited to such applications. Alloy has good machinability under high speeds and heavy l
7、oads. 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 issue is specified. When the refe
8、renced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org. AMS 2694 Repair Welding of Aerospace Castings AMS 2804
9、 Identification, Castings SAE AMS4842E Page 2 of 6 2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959 or www.astm.org. ASTM E 18 Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials ASTM E 54 Chemical Analysis of Sp
10、ecial Brasses and Bronzes ASTM E 1220 Visible Penetrant Examination Using the Solvent-Removable Process ASTM E 1417 Liquid Penetrant Examination ASTM E 1742 Radiographic Examination 3. TECHNICAL REQUIREMENTS: 3.1 Composition: Shall conform to the following percentages by weight shown in Table 1, det
11、ermined by wet chemical methods in accordance with ASTM E 54, by spectrochemical methods, or by other analytical methods acceptable to purchaser: TABLE 1 - Composition Element (3.3.1) min max Copper (3.1.2, 3.1.3) 78.0 82.0 Tin 9.0 11.0 Lead 8.0 11.0 Nickel (3.1.2) - 1.0 Zinc - 0.8 Antimony - 0.55 I
12、ron - 0.15 Phosphorus - 0.15 Sulfur - 0.08 Aluminum - 0.005 Silicon - 0.005 Other Elements, total - 0.35 3.1.1 These composition limits do not preclude the presence of other elements. Limits may be established and analysis required for unnamed elements by agreement between the manufacturer or suppli
13、er and purchaser. 3.1.2 In determining copper minimum, copper may be calculated as copper plus nickel. 3.1.3 Copper may be reported as “remainder”, or as the difference between the sum of results for all elements and 100%, or as the result of direct analysis. SAE AMS4842E Page 3 of 6 3.2 Condition:
14、As cast. 3.3 Casting: Castings shall be produced in lots from metal conforming to 3.1. A lot shall be all castings produced from one furnace melt or crucible melt except that, when two or more furnace melts or crucible melts or combination thereof are used to charge a ladle for pouring, the castings
15、 therefrom shall constitute a lot. A lot shall be not more than 2000 pounds (907 kg) of castings. 3.4 Chemical Analysis Specimens: Shall be cast from each melt and be of any convenient size, shape, and form. 3.5 Properties: Castings shall conform to the following requirements; 3.5.1 Hardness: Shall
16、be as follows, determined in accordance with ASTM E 18: 3.5.1.1 Sand Castings: Not lower than 65 HRF, or equivalent. 3.5.1.2 Centrifugal Castings: Not lower than 75 HRF, or equivalent. 3.5.2 Structure: May show a uniform distribution of lead in the copper-tin matrix. Method of testing and standards
17、for acceptance shall be as agreed upon by purchaser and vendor. 3.6 Quality: 3.6.1 Castings, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the castings. 3.6.1.1 Castings shall have smooth sur
18、faces and shall be cleaned sufficiently to permit penetrant examination. 3.6.2 Castings, when specified, shall be produced under radiographic control. This control shall consist of radiographic examination of castings in accordance with ASTM E 1742 until proper foundry technique, which will produce
19、castings free from harmful internal imperfections, is established for each part number and of production castings as necessary to ensure maintenance of satisfactory quality. 3.6.3 Castings, when specified, shall be subjected to fluorescent penetrant inspection in accordance with ASTM E 1417, to cont
20、rast dye penetrant inspection in accordance with ASTM E 1220, or to both. SAE AMS4842E Page 4 of 6 3.6.4 Radiographic, fluorescent penetrant, contrast dye penetrant, and other quality standards shall be as agreed upon by purchaser and vendor. 3.6.5 Castings shall not be reworked by peening, plugging
21、, welding, or other methods without written permission from purchaser. 3.6.5.1 When permitted in writing by purchaser, imperfections in castings may be reworked by welding in accordance with AMS 2694. 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of castings shall su
22、pply 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 castings conform to specified requirements. 4.2 Classification of Tests: All techn
23、ical requirements are acceptance tests and preproduction tests and shall be performed prior to or on the first-article shipment of a casting to a purchaser, on each melt or lot as applicable, when a change in material and/or processing requires reapproval as in 4.4.2, and when purchaser deems confir
24、matory testing to be required. 4.3 Sampling and Testing: Shall be in accordance with the following: 4.3.1 One or more chemical analysis specimens in accordance with 3.4 from each melt, a casting from each lot, or both. 4.3.2 Two preproduction castings in accordance with 4.4.1 of each part number. 4.
25、4 Approval: 4.4.1 Sample castings from new or reworked patterns or molds and the casting procedure shall be approved by purchaser before castings for production use are supplied, unless such approval be waived by purchaser. 4.4.2 Vendor shall establish, for production of sample castings of each part
26、 number, parameters for the process control factors which will produce acceptable castings; these shall constitute the approved casting procedure and shall be used for producing production castings. If necessary to make any change in parameters for the process control factors, vendor shall submit fo
27、r reapproval a statement of the proposed changes in processing and, when requested, test specimens, sample castings, or both. Production castings incorporating the revised operations shall not be shipped prior to receipt of reapproval. SAE AMS4842E Page 5 of 6 4.4.2.1 Control factors for producing c
28、astings include, but are not limited to, the following: Type of furnace Furnace atmosphere Fluxing or deoxidation procedure Gating and risering practices Metal pouring temperature; variation of 50 F (28 C) from the established limit is permissible Mold rotational speed for centrifugal castings Solid
29、ification and cooling procedures Cleaning operations Methods of inspection 4.4.2.1.1 Any of the above process control factors for which parameters are considered proprietary by the vendor may be assigned a code designation. Each variation in such parameters shall be assigned a modified code designat
30、ion. 4.5 Reports: The vendor of castings shall furnish with each shipment a report showing the results of tests for chemical composition of at least one casting or of separately-cast specimens from each melt and for hardness of each lot. This report shall include the purchase order number, lot numbe
31、r, AMS 4842E, part number, and quantity. 4.6 Resampling and Retesting: If any specimen used in the above tests fails to meet the specified requirements, disposition of the castings may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of
32、any retest specimen to meet the specified requirements shall be cause for rejection of the castings represented and no additional testing shall be permitted. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY: 5.1 Identification: Shall be in accordance with AMS 2804. 5.2 Packaging:
33、Castings 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 castings to ensure carrier acceptance and safe delivery. SAE AMS4842E Page 6 of 6 6. ACKNOWLEDGMENT:
34、 A vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS: Castings not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES: 8.1 A change bar (|)
35、located 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 a specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including tec
36、hnical revision. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions in inch/pound units are primary; dimensions in SI units are shown as the approximate equivalents of th
37、e primary units and are presented only for information. 8.4 Purchase documents should specify not less than the following: AMS 4842E Type and part number or pattern or mold number of castings desired Quantity of castings desired Method of testing and acceptance standards for structure (See 3.5.2) Ty
38、pe of nondestructive testing required and standards for acceptance (See 3.6). 8.5 Similar Specifications: ASTM B 271 (Alloy C93700), is listed for information only and shall not be construed as an acceptable alternate unless all requirements of this AMS are met. PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “D“
