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 2014 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/AMS5844H AEROSPACE MATERIAL SPECIFICATION AMS5844 REV. H Issued 1972-11 Reaffirme
5、d 2007-08 Revised 2014-04 Superseding AMS5844G Alloy, Corrosion-Resistant, Round Bars 20Cr - 35Ni - 35Co - 10Mo Vacuum Induction Plus Consumable Electrode Vacuum Remelted Solution Heat Treated and Work Strengthened (Composition similar to UNS R30035) RATIONALE AMS5844H revises Condition (3.3.1), Pro
6、perties, (3.5.2) and Reports (4.4, 4.4.5, 4.4.6), and is a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers a high-strength, corrosion-resistant alloy in the form of bars up to 1.75 inch (44.4 mm) in diameter (See 8.2). 1.2 Application These bars have be
7、en used typically for applications requiring a combination of high strength, good tension-tension fatigue strength, toughness, ductility, and exceptionally good corrosion resistance after aging (See 8.2), but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the followi
8、ng 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 d
9、ocument has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2261 Tolerances, Nicke
10、l, Nickel Alloy, and Cobalt Alloy Bars, Rods, and Wire AMS2269 Chemical Check Analysis Limits, Nickel, Nickel Alloys, and Cobalt Alloys SAE INTERNATIONAL AMS5844H Page 2 of 5 AMS2371 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steels and Alloys, Wrought Products and Forging
11、Stock AMS2750 Pyrometry AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, T
12、el: 610-832-9585, www.astm.org. ASTM E 8/E 8M Tension Testing of Metallic Materials ASTM E 18 Rockwell Hardness of Metallic Materials ASTM E 112 Determining Average Grain Size ASTM E 354 Chemical Analysis of High-Temperature, Electrical, Magnetic, and Other Similar Iron, Nickel, and Cobalt Alloys 3.
13、 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 354, by spectrochemical methods, or by other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max Carbon Mang
14、anese Silicon Phosphorus Sulfur Chromium Nickel Molybdenum Titanium Iron Cobalt - - - - - 19.00 33.00 9.00 - - remainder 0.025 0.15 0.15 0.015 0.010 21.00 37.00 10.50 1.00 1.00 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2269. 3.2 Melting Practice Alloy s
15、hall be multiple melted using vacuum induction melting followed by consumable electrode vacuum remelting. 3.3 Condition Solution heat treated and work strengthened. SAE INTERNATIONAL AMS5844H Page 3 of 5 3.3.1 Bars shall not be cut from plate (Also see 4.4.5). 3.4 Solution Heat Treatment Bars shall
16、be solution heat treated by heating to a temperature within the range 1900 to 1925 F (1038 to 1052 C), holding at the selected temperature within 25 F (14 C) for 4 to 8 hours, and cooling in air to room temperature. Pyrometry shall be in accordance with AMS2750. 3.5 Properties Bars shall conform to
17、the following requirements: 3.5.1 As Solution Heat Treated and Work Strengthened 3.5.1.1 Hardness Shall be not lower than 38 HRC, or equivalent (See 8.3), determined in accordance with ASTM E 18. Product shall not be rejected on the basis of hardness if the tensile properties of 3.5.2 are acceptable
18、, determined on specimens taken from the same sample as that with nonconforming hardness or from another sample with similar nonconforming hardness. 3.5.1.2 Average Grain Size Shall be ASTM No. 4 or finer, determined in accordance with ASTM E 112. 3.5.2 Tensile Properties After Aging Properties for
19、bars up to 1.75 inches (44.4mm) round shall be as shown in Table 2, determined in accordance with ASTM E 8/E 8M on specimens as in 4.3, after aging by heating to a temperature within the range 1000 to 1200 F (538 to 649 C), holding at the selected temperature within 25 F (14 C) for 4 to 4-1/2 hours,
20、 and cooling in air to room temperature. Mechanical property requirements for bars larger than 1.75 inch (44.4 mm) diameter shall be agreed upon between purchaser and producer (See 8.2). TABLE 2 - MINIMUM TENSILE PROPERTIES Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in
21、4D Reduction of Area 260 ksi (1793 MPa) 230 ksi (1586 MPa) 8% 35% 3.6 Quality Bars, 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 bars. 3.7 Tolerances Shall conform to all applicable requ
22、irements of AMS2261. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection 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 deem
23、ed necessary to ensure that the bars conform to specified requirements. SAE INTERNATIONAL AMS5844H Page 4 of 5 4.2 Classification of Tests All technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. 4.3 Sampling and Testing Shall be in accordance with AM
24、S2371 and the following: In testing round bars, specimens for tensile testing (3.5.2) shall be of standard proportions in accordance with ASTM E 8/E 8M with either 0.250-inch (6.35-mm) diameter at the reduced parallel gage section or smaller specimens proportional to the standard when required. Spec
25、imens shall be machined from the center of bars 0.800 inch (20.32 mm) and under in nominal diameter and from midradius of larger size bars. 4.4 Reports The vendor of the product shall furnish with each shipment a report showing the the vendors name and country where the metal was melted (e.g., final
26、 melt in the case of metal processed by multiple melting operations) and the following results of tests and relevant information: 4.4.1 For Each Heat Composition. 4.4.2 For Each Lot Hardness Average grain size Tensile properties. 4.4.3 A statement that the product conforms to the other technical req
27、uirements. 4.4.4 Purchase order number Heat and lot numbers AMS5844H Size Quantity. 4.4.5 If the ship size/shape is cut from a larger cross section, report the nominal metallurgically worked size (See 3.5). 4.4.6 When the product size is outside the size range covered by 3.5.2, the report shall cont
28、ain a statement to that effect. 4.5 Resampling and Retesting Shall be in accordance with AMS2371. 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight bars will be acceptable in mill lengths of 6 to 24 feet (1.8 to 7.3 m) but not more th
29、an 25% of any shipment shall be supplied in lengths of 6 to 9 feet (1.8 to 2.7 m), except that for bars weighing over 25 pounds per foot (37 kg/m), short lengths down to 2 feet (610 mm) may be supplied. 5.2 Identification Shall be in accordance with AMS2806. SAE INTERNATIONAL AMS5844H Page 5 of 5 5.
30、3 Packaging Bars 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. ACKNOWLEDGMENT A vendor shall mentio
31、n 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 (|) located in the left margin i
32、s 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 revisions. Change bars and (
33、R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 This alloy depends upon combinations of cold working and aging to attain a variety of combinations of strength and ductility. Mill capabilities at the present time are limited to cold drawing bars 1-3
34、/4 inches (44.4 mm) and under in nominal diameter to attain the full properties specified in Table 2. 8.3 Hardness conversion tables for metals are presented in ASTM E 140. Use of the nickel and nickel alloy table is recommended. 8.4 Terms used in AMS are clarified in ARP1917. 8.5 Dimensions and pro
35、perties 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. 8.6 Purchase documents should specify not less than the following: AMS5844H Size of bars desired Property and acceptance requirements from the cognizant engineering organization applicable to sizaes outside the range listed in 1.1. Quantity of bars desired. PREPARED BY AMS COMMITTEE “F”
