SAE-AMS-2281A-2002-R2007.pdf

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 therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright © 2007 SAE International All rights reserved. No part of this publication 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: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org Trace Element Control Nickel Alloy, Cobalt Alloy, and Iron Alloy Wrought Products for High-Temperature, High-Stressed Applications RATIONALE This document has been reaffirmed to comply with the SAE 5-year Review policy. 1. SCOPE: 1.1 Purpose: This specification establishes maximum permissible limits for elements not normally specified but which may occur in trace amounts in wrought nickel, cobalt, and iron alloy products. 1.2 Application: Control provided by this specification has been used typically for highly-stressed rotating parts, such as turbine discs, where control of trace elements is required to maintain elevated-temperature tensile, stress-rupture, creep, and low-cycle fatigue properties, but usage is not limited to such applications. 1.2.1It is intended that this specification be invoked only for selected applications by stipulation on drawings, purchase orders, or other documentation supplementing the material specification, or in material specifications. AEROSPACE MATERIAL SPECIFICATION AMS 2281A IssuedAPR 1989 RevisedAUG 2002 ReaffirmedAPR 2007 Superseding AMS 2281 Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:47:30 MSTNo reproduction or networking permitted without license from IHS -,-,- AMS 2281ASAEAMS 2281A - 2 - 1.3 Classification: This specification covers four classes of trace element control (See 8.2), defined by the elements to be controlled as follows: Class 1 Lead, Bismuth Class 2 Lead, Bismuth, Selenium Class 3 Lead, Bismuth, Selenium, Silver, Tin Class 4 Lead, Bismuth, Selenium, Silver, Tin, Thallium, Tellurium, Arsenic 1.3.1When trace element control is required, the elements to be controlled shall be indicated by this specification number and the appropriate class number. For example, AMS 2281A, Class 1 will indicate that control of lead and bismuth is required. 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 referenced 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. ARP1313 Determination of Trace Elements in High Temperature Alloys Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:47:30 MSTNo reproduction or networking permitted without license from IHS -,-,- AMS 2281ASAEAMS 2281A - 3 - 3. TECHNICAL REQUIREMENTS: 3.1When this specification is invoked, the elements for which control is required shall not exceed the following percentages by weight as applicable to the class specified. These requirements supplement those of the applicable material specification. No check analysis limits apply to these elements. The elements requiring control and the limit for each shall be as shown in Table 1: 3.2 Analytical Procedures: The analytical procedures for determining conformance of a product to the requirements of this specification and the methods of obtaining or producing standards on which the analytical results are based, shall be established industry techniques acceptable to purchaser (See 8.3). ARP1313 details methods which may be used for determining the trace elements. TABLE 1 Composition Limits ClassElementLimit, Percent(ppm) 1Lead0.0005(5) Bismuth0.00003(0.3) 2Lead0.0005(5) Bismuth0.00003(0.3) Selenium0.0003(3) 3Lead0.0005(5) Bismuth0.00003(0.3) Selenium0.0003(3) Silver0.0005(5) Tin0.0050(50) 4Lead0.0005(5) Bismuth0.00003(0.3) Selenium0.0003(3) Silver0.0005(5) Tin0.0050(50) Thallium0.0001(1) Tellurium0.00005(0.5) Arsenic0.0025(25) Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:47:30 MSTNo reproduction or networking permitted without license from IHS -,-,- AMS 2281ASAEAMS 2281A - 4 - 3.2.1The following methods, not detailed in ARP1313, may also be considered acceptable; these procedures are not listed in any order of preference: Atomic absorption by other techniques Inductively coupled plasma emission spectroscopy Direct current plasma emission spectroscopy Emission spectrography by other techniques Glow discharge mass spectrometry Isotope dilution mass spectrometry TOPO/extraction ultraviolet or visible spectrophotometry. 4. QUALITY ASSURANCE PROVISIONS: Shall be as specified in the applicable material specification and as follows: 4.1 Reports: The report of composition required by the material specification shall also include the actual amounts found for each trace element required to be determined by the class specified, the laboratory performing the trace analysis, and the analytical technique(s) used. When it is not appropriate to report an actual amount due to analytical considerations, the following reporting conventions shall be used: 4.1.1The symbol or the words “less than“ preceding a number shall be used to indicate the apparent presence of the element in an amount above the detection limit but below that value which can be meaningfully quantified. 4.1.2The symbol or the words “less than“ preceding a number and the letters “ND“ for “none detected“ following the number, shall be used to indicate the apparent absence of the element and the number value indicative of the detection limit. 4.2When requested, laboratories performing trace element analysis using techniques other than those in ARP1313 shall provide data demonstrating equivalent analytical capability. 5. PREPARATION FOR DELIVERY: Not applicable. 6. ACKNOWLEDGMENT: Not applicable. 7. REJECTION: Not applicable. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:47:30 MSTNo reproduction or networking permitted without license from IHS -,-,- AMS 2281ASAEAMS 2281A - 5 - 8. NOTES: 8.1A change bar (|) 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. Change bars and (R) are not used in original publications, no in specifications that contain editorial changes only. 8.2The term “trace element“ as used in this specification means any element occurring in the specified alloy systems that was not intentionally added as an alloying addition and which may have a deleterious effect on mechanical properties. 8.3The limits on trace elements specified approach the limit of detection; therefore, utmost care must be used in their determination. 8.4It is recommended that purchasers intending to invoke this specification identify, prior to purchase of product, one or more qualified laboratories with the demonstrated capability of providing adequate analyses to this specification, AMS 2280, Trace Element Control, Nickel Alloy Castings, or similar proprietary specifications. The ready availability of such a laboratory will expedite conformance to specification requirements in the event that problems occur with the vendor's ability to provide valid test results. 8.5Terms used in AMS are clarified in ARP1917. PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “F“ Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:47:30 MSTNo reproduction or networking permitted without license from IHS -,-,-