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 isentirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, 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 2016 SAE InternationalAll rights reserved. No part of this public
3、ation 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 (outs
4、ide 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/AMS5926AEROSPACEMATERIAL SPECIFICATIONAMS5926Issued 2010-08Reaffirmed 2016-09Steel, Corrosion-
5、Resistant, Bars, Wire, Tubing, and Forgings15.5Cr 1.5Si 0.3Mo 0.1N (0.45 0.60C)for Bearing Applications(Composition similar to UNS S42716)RATIONALEAMS5926 has been reaffirmed to comply with the SAE five-year review policy.1. SCOPE 1.1 Form This specification covers a corrosion and heat-resistant ste
6、el in the form of bars, wire, tubing, forgings, and forging stock. 1.2 Application These products have been used typically for anti-friction bearing parts requiring resistance to both corrosion and wear with hardness usually not lower than 58 HRC after hardening and tempering, but usage is not limit
7、ed 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 may work to a subsequent revision of a document unless a specific document issue is specif
8、ied. 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 International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Cana
9、da) or 724-776-4970 (outside USA), www.sae.org. AMS2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and Wire AMS2248 Chemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron Al
10、loys AMS2371 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steels and Alloys, Wrought Products and Forging Stock AMS2374 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steel and Alloy Forgings AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Ext
11、rusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys AMS2808 Identification, Forgings AS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing 2.2 ASTM Publications Available from ASTM International, 100 Ba
12、rr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A 370 Mechanical Testing of Steel Products ASTM E 45 Determining the Inclusion Content of Steel ASTM E 112 Determining Average Grain Size ASTM E 353 Chemical Analysis of Stainless, Heat-Resisting,
13、 Maraging, and Other Similar Chromium-Nickel-Iron Alloys ASTM E 381 Macroetch Testing Steel Bars, Billets, Blooms, and Forgings ASTM E 384 Microindentation Hardness of Materials 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet c
14、hemical methods in accordance with ASTM E 353, by spectrochemical methods, or by other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max Carbon 0.45 0.60 Manganese - 0.8 Silicon 1.30 1.70 Phosphorus - 0.030Sulfur - 0.01 Chromium 15.00 16.50 Molybdenum 0.20 0.40 Vanadi
15、um 0.20 0.40 Nitrogen 0.05 0.2 Nickel - 0.4 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2248. 3.2 Condition The product shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A 370: SAE INTE
16、RNATIONAL AMS5926 Page 2 of 8_ 3.2.1 Bars Shall have hardness not higher than 255 HB, or equivalent (See 8.2). 3.2.1.1 Bars 2.750 Inches (69.85 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides, and All Hexagons Shall be cold finished. 3.2.1.2 Bars, Other Than Hexagons, Over
17、 2.750 Inches (69.85 mm) in Nominal Diameter or Least Distance Between Parallel Sides Shall be hot finished. 3.2.2 Wire Cold finished having tensile strength not higher than 130 ksi (896 MPa) or equivalent hardness (See 8.3). 3.2.3 Forgings As ordered. 3.2.4 Forging Stock As ordered by the forging m
18、anufacturer. 3.3 Properties The product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A 370: 3.3.1 Macrostructure 3.3.1.1 Transverse Visual examination of transverse full cross-sections from bars, wire, billets, and forging stock, etched in
19、hot hydrochloric acid in accordance with ASTM E 381, shall show no pipe or cracks. Porosity, segregation, inclusions and other imperfections shall be no worse than the macrographs of ASTM E 381 shown in Table 2. TABLE 2 - MACROSTRUCTURE RATING LIMITS Cross Section Area, Square Inches Cross Section A
20、rea, Square Centimeters Macrographs Up to 36, incl Up to 232, incl S2 R4 C3 SAE INTERNATIONAL AMS5926 Page 3 of 8_ 3.3.1.2 Longitudinal Visual examination of sections as in 4.3.4 from bars, billets, and forging stock over 0.500 inch (12.7 mm) in nominal thickness or diameter, after preparation and e
21、tching as in 3.3.3.2.1, shall show no streaks longer than 1/8 inch (3.2 mm) attributable to carbide segregation. 3.3.1.2.1 The surface to be examined, 2 inches (50.8 mm) long, minimum, by full diameter or thickness, shall be polished with 180 grit or finer abrasive and etched for sufficient time to
22、produce a dark gray background coloration. The etchant may be 1:1 hydrochloric acid at 150 to 160 F (66 to 71 C) or 1:1 hydrochloric acid plus 1% hydrogen peroxide swabbed at room temperature. 3.3.2 Micro-Inclusion Rating At least one specimen from each ingot tested, as well as two-thirds of the tot
23、al number of specimens and the average of all specimens, shall not exceed the limits shown in Table 3, determined in accordance with ASTM E 45, Method A, except that the length of any inclusion shall be not greater than 0.025 inch (0.64 mm). TABLE 3 - MICRO-INCLUSION RATING LIMITS Type A B C D Thin
24、1.0 2.5 1.0 2.0 Heavy 0.5 2.0 0.5 1.5 3.3.3 Response to Heat Treatment Specimens as in 4.3.3, protected by suitable means or treated in a neutral atmosphere to minimize scaling and prevent either carburization or decarburization, shall have hardness not lower than 56 HRC, or equivalent (See 8.2), af
25、ter being heated to 1925 F 25 (1052 C 14), held at heat for 30 minutes 3, quenched in oil, sub-zero cooled to -100 F 20 (-73 C 11), held for 2 hours 0.25, warmed in air to room temperature and tempered at 350 F 10 (177 C 6) for 60 minutes 5. 3.3.3.1 Average Grain Size Shall be ASTM No. 6 or finer, d
26、etermined in accordance with ASTM E 112 on specimens hardened in accordance with the procedure of 3.3.3. 3.3.4 Decarburization 3.3.4.1 Bars and wire ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. 3.3.4.2 Allowable decarburization o
27、f bars, wire, and billets ordered for redrawing or forging or to specified microstructural requirements shall be agreed upon by purchaser and vendor. 3.3.4.3 Decarburization of bars and wire to which 3.3.4.1 or 3.3.4.2 is not applicable shall be not greater than shown in Table 4. SAE INTERNATIONAL A
28、MS5926 Page 4 of 8_ TABLE 4A - MAXIMUM DECARBURIZATION, INCH/POUND UNITS Nominal Diameter or Distance Between Parallel Sides Inches Total Depth of Decarburization Inch Up to 0.500, incl 0.010 Over 0.500 to 1.000, incl 0.015 Over 1.000 to 1.500, incl 0.020 Over 1.500 to 2.000, incl 0.025 Over 2.000 t
29、o 2.500, incl 0.030 Over 2.500 to 3.000, incl 0.035 Over 3.000 to 4.000, incl 0.045 TABLE 4B - MAXIMUM DECARBURIZATION, SI UNITS Nominal Diameter or Distance Between Parallel Sides Millimeters Total Depth of Decarburization Millimeters Up to 12.70, incl 0.25 Over 12.70 to 25.40, incl 0.38 Over 25.40
30、 to 38.10, incl 0.51 Over 38.10 to 50.80, incl 0.64 Over 50.80 to 63.50, incl 0.76 Over 63.50 to 76.20, incl 0.89 Over 76.20 to 101.60, incl 1.14 3.3.4.4 Decarburization shall be measured by the metallographic method, by HR30N scale hardness testing method, or by the microhardness traverse method us
31、ing microhardness testing in accordance with ASTM E 384. The hardness method(s) shall be conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured by hardness method, is defined as the perpend
32、icular distance from the surface to the depth under that surface below which there is no further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by decarburization on the adjacent surface. In case of dispute, the depth of decarburization
33、determined using the microhardness traverse method shall govern. 3.3.4.4.1 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the above limits by more than 0.005 inch (0.13 mm) and the width is 0.065 in
34、ch (1.65 mm) or less. 3.4 Quality The product, 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 product. 3.4.1 Bars and wire ordered hot rolled or cold drawn or ground, turned, or polished s
35、hall, after removal of the standard stock removal allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the ground, turned, or polished surface. 3.4.2 Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow general contour of th
36、e forgings showing no evidence of reentrant grain flow. 3.5 Tolerances Bars and wire shall conform to all applicable requirements of AMS2241. SAE INTERNATIONAL AMS5926 Page 5 of 8_ 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product shall supply all samples fo
37、r 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 product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Compos
38、ition (3.1), condition (3.2), macrostructure (3.3.1.1 and 3.3.1.2), micro-inclusion rating (3.3.2), response to heat treatment (3.3.3), average grain size (3.3.3.1), decarburization (3.3.4), and tolerances (3.5) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Gra
39、in flow of die forgings (3.4.2) is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be as follows. 4.3.1 Bars, Wire, and Forging Stock In accordance with AMS2371. 4.3.2 Forgings In accor
40、dance with AMS2374. 4.3.3 Specimens for response to heat treatment (3.3.3) of bars, wires, and billets shall be not less than 0.375 inch (9.52 mm) in thickness. Minimum dimensions in other directions shall be either those of the product thickness or 1.125 1.125 inches (28.58 28.58 millimeters). 4.3.
41、4 Samples for longitudinal macrostructure (3.3.1.2) testing shall be 2 inches (51 mm) long specimens taken through the center of the cross-section of the product supplied. 4.4 Reports The vendor of the product shall furnish with each shipment a report showing the results of tests for composition, tr
42、ansverse macrostructure and micro-inclusion rating of each heat and for condition, response to heat treatment, average grain size and longitudinal macrostructure of each lot, stating if sub-zero cooling was used for response to heat treatment, and stating that the product conforms to the other techn
43、ical requirements. This report shall include the purchase order number, heat and lot numbers, AMS5926, product form, size, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included. 4.5 Resampling and Retesting Shall be as follows: 4.5
44、.1 Bars, Wire, and Forging Stock In accordance with AMS2371. SAE INTERNATIONAL AMS5926 Page 6 of 8_ 4.5.2 Forgings In accordance with AMS2374. 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight bars and wire will be acceptable in mill
45、lengths of 6 to 20 feet (1.8 to 6.1 mm) but not more than 10% of any shipment shall be supplied in lengths shorter than 10 feet (3 m). 5.2 Identification Shall be as follows 5.2.1 Bars and Wire In accordance with AMS2806. 5.2.2 Forgings In accordance with AMS2808. 5.2.3 Forging Stock As agreed upon
46、by purchaser and vendor. 5.3 Packaging 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 product to ensure carrier acceptance and safe delivery. 6.
47、 ACKNOWLEDGMENT A vendor shall mention this specification number in all quotations and when acknowledging purchase orders. 7. REJECTIONS Product 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 editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the
