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 theref
2、rom, 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 2015 SAE InternationalAll rights reserved. No part of this publi
3、cation 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: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS7310LAEROSPACEMATERIAL SPECIFICATIONAMS7310 REV. LIssued 1941-11Noncurrent 2002-08Revised
5、2010-10Reaffirmed 2015-11Rings, Piston, Cast IronAs CastRATIONALEAMS7310L has been reaffirmed to comply with the SAE five-year review policy.1. SCOPE 1.1 Form This specification covers piston rings fabricated from cast iron. 1.2 Application These rings have been used typically as compression rings,
6、oil scraper rings, and dual oil control rings in aircraft engines, but usage is not limited to such applications. 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 m
7、ay work to a subsequent revision of a document unless a specific document 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
8、, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A 247 Evaluating the Microstructure of Graphite in Iron Castings ASTM E 18 Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials ASTM E 351 Chemical Analysis of Cast Ir
9、on - All Types 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 351, by spectrochemical methods, or by other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element mi
10、n maxTotal Carbon 3.50 3.90Silicon 2.20 3.10Manganese 0.40 0.80Phosphorus 0.30 0.80Sulfur - 0.133.1.1 Alloying elements may be added, with the approval of purchaser, to produce a high quality iron meeting the requirements of 3.3 and 3.4. 3.2 Fabrication Rings shall be machined from castings in the a
11、s-cast condition. 3.2.1 Finish Sides of rings shall be ground or lapped. Periphery shall be turned smooth. 3.3 Properties Rings shall conform to the following requirements: 3.3.1 Finished Rings 3.3.1.1 Hardness Shall be 77 to 91 HRG or equivalent (See 8.2), determined in accordance with ASTM E 18. 3
12、.3.1.2 Microstructure Shall be free from abnormal segregation. Matrices shall be essentially fine pearlite with no appreciable amounts of massive cementite, determined in accordance with ASTM A 247. Both phosphide eutectic and graphite shall be evenly distributed and the latter shall be present prim
13、arily in the form of randomly oriented flakes. 3.3.1.3 Circularity The diameter through the gap shall exceed the diameter 90 degrees from the gap by not less than 0.0025 inch per inch (0.0025 mm/mm) of nominal ring diameter when finished ring is held around its periphery by a flexible steel band 0.0
14、045 to 0.0055 inch (0.114 to 0.140 mm) thick and of a width approximately equal to that of the ring and whose inside circumference is equal to the nominal outside circumference of the ring 0.003 inch (0.08 mm). 3.3.1.4 Light-Tightness of Periphery When finished ring is placed in a circular gage whos
15、e ID is equal to the nominal OD of the ring 0.0005 inch (0.013 mm), the portion of the periphery on each side of the gap equal to 20% of the nominal OD of the ring shall be light-tight. The space between the balance of the ring periphery and ID of gage shall be not greater than 0.0005 inch (0.013 mm
16、) at any point and not less than 85% of the periphery of the ring shall be light-tight. Intermittent or fuzzy light shall be considered the same as light-tight. SAE INTERNATIONAL AMS7310L Page 2 of 5_ 3.3.1.5 Flatness When weight of not more than 0.50 pound per inch (9 kg/m) of nominal ring OD is ap
17、plied to a ring supported in a gage having the same nominal diameter +0.001, -0.000 inch (+0.025, -0.000 mm) and having the same interior angle as the nominal angle between side face and periphery of ring, the ring shall show at least line contact around not less than 85% of the side face of the rin
18、g, determined by light gage, bluing, or other method acceptable to purchaser. This contact may be anywhere between the inside and outside circumference and may vary between these limits on any one ring. This contact shall indicate that ring side faces are not wavy. 3.4 Quality Rings, as received by
19、purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the rings. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of rings shall supply all samples for vendors tests and shall be respons
20、ible 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 rings conform to specified requirements. 4.2 Classification of Tests 4.2.1 All technical requirements are acceptance tests and preproduct
21、ion tests and shall be performed prior to or on the first-article shipment of a ring to a purchaser, on each melt or lot as applicable, when a change in material or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required. 4.3 Sampling and Testing Shal
22、l be in accordance with the following; a lot shall be all rings of the same size or part number, from the same melt of iron, and presented for vendors inspection at one time: 4.3.1 Composition One or more samples from each melt. If composition is determined on the melt, a chilled pencil-type specime
23、n is preferred for carbon determinations but other types of samples of proven accuracy may be used. If composition is determined on rings or ring castings, a solid sample cut from the ring or casting shall be used. 4.3.2 Hardness One or more rings of each part number in each shipment. 4.3.3 Dimensio
24、nal Requirements As agreed upon by purchaser and vendor. 4.4 Approval 4.4.1 Sample rings shall be approved by purchaser before rings for production use are supplied, unless such approval is waived by purchaser. 4.4.2 Vendor shall use manufacturing procedures, processes, and methods of inspection on
25、production rings which are essentially the same as those used on the approved sample rings. If necessary to make any change in manufacturing procedures or processes, vendor shall submit for reapproval a statement of the proposed changes in operations and, when requested, sample rings. Production rin
26、gs made by the revised procedure shall not be shipped prior to receipt of reapproval. SAE INTERNATIONAL AMS7310L Page 3 of 5_ 4.5 Reports The vendor of castings shall furnish with each shipment a report showing the results of tests to determine conformance to the acceptance test requirements. This r
27、eport shall include the purchase order number, lot number, AMS7310L, and part number. 4.6 Resampling and Retesting If any specimen used in the above tests fails to meet specified requirements, disposition of the rings may be based on the results of testing three additional specimens for each origina
28、l nonconforming specimen. Failure of any retest specimen to meet specified requirements shall be cause for rejection of the rings represented. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Packaging and Identification 5.1.1 Rings shall be protected, during shipment and stor
29、age, by coating with a corrosion-preventive compound which is readily removable in hydrocarbon solvents. 5.1.2 Each ring shall be packaged in a grease and oil-resistant envelope or a group of rings shall be roll-wrapped to ensure that the rings, during shipment and storage, will be protected against
30、 mechanical injury. 5.1.3 Each package shall be marked with not less than the following information: Rings, Piston, Cast Iron AMS7310L Part Number Purchase Order Number Quantity Manufacturers Identification 5.1.4 Packages of rings shall be prepared for shipment in accordance with commercial practice
31、 and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the rings to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A vendor shall include this specification number and its revision letter in all quotations and when acknow
32、ledging purchase orders. 7. REJECTIONS Rings not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not e
33、ditorial 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 revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial ch
34、anges only. 8.2 Equivalent hardness 97-107 HRB. Additional hardness conversion tables for metals are presented in ASTM E 140. 8.3 Terms used in AMS are clarified in ARP1917. SAE INTERNATIONAL AMS7310L Page 4 of 5_ 8.4 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are
35、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. 8.5 Purchase documents should specify not less than the following: AMS7310L Part number or size of rings desired Quantity of rings desired Special packaging, if required. PREPARED BY AMS COMMITTEE “E” SAE INTERNATIONAL AMS7310L Page 5 of 5_
