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 2017 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:/standards.sae.org/AMS6523H AEROSPACE MATERIAL SPECIFICATION AMS6523 REV. H Issued 1970-11 Revised 2017-08 Superse
5、ding AMS6523G Steel, Sheet, Strip, and Plate 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Vacuum Consumable Electrode Melted, Annealed (Composition similar to UNS K91472) RATIONALE AMS6523H results from a Five-Year Review and update of this specification that includes revision of the micro-
6、inclusion (3.5.2.1), decarburization testing methods (3.5.4) and revises reporting (4.4). 1. SCOPE 1.1 Form This specification covers a premium aircraft-quality, low-alloy steel in the form of sheet, strip, and plate. 1.2 Application These products have been used typically for parts requiring throug
7、h-hardening to high strength and toughness levels and where such parts may require welding during fabrication, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE public
8、ations shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supers
9、edes applicable laws and regulations unless a specific exemption has been obtained. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2252 Tolerances Lo
10、w-Alloy Steel Sheet, Strip, and Plate AMS2259 Chemical Check Analysis Limits Wrought Low-Alloy and Carbon Steels AMS2300 Steel Cleanliness, Premium Aircraft-Quality Magnetic Particle Inspection Procedure AMS2370 Quality Assurance Sampling and Testing Carbon and Low-Alloy Steel Wrought Products and F
11、orging Stock SAE INTERNATIONAL AMS6523H Page 2 of 7 AMS2750 Pyrometry AMS2759 Heat Treatment of Steel Parts, General Requirements AMS2807 Identification Carbon and Low-Alloy Steels, Corrosion and Heat-Resistant Steels and Alloys Sheet, Strip, Plate, and Aircraft Tubing ARP1917 Clarification of Terms
12、 Used in Aerospace Metals Specifications 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A370 Mechanical Testing of Steel Products ASTM A604 Macroetch Testing of Consumable Electrod
13、e Remelted Steel Bars and Billets ASTM E45 Determining the Inclusion Content of Steel ASTM E112 Determining Average Grain Size ASTM E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope H
14、ardness, and Leeb Hardness ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E384 Microindentation Hardness of Materials ASTM E399 Plane-Strain Fracture Toughness of Metallic Materials 3. TECHNICAL REQUIREMENTS 3.1 Composition S
15、hall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element Min Max Carbon Manganese Silicon Phosphorus Sulfur Chromium N
16、ickel Cobalt Molybdenum Vanadium Copper 0.17 0.20 - - - 0.65 8.50 4.25 0.90 0.06 - 0.23 0.40 0.20 0.010 0.010 0.85 9.50 4.75 1.10 0.12 0.35 SAE INTERNATIONAL AMS6523H Page 3 of 7 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Melting Practice Steel
17、 shall be multiple melted using vacuum consumable electrode practice in the remelt cycle. 3.3 Condition The product shall be supplied in the following condition; hardness shall be determined in accordance with ASTM A370. 3.3.1 Sheet and Strip Cold finished, bright or atmosphere annealed, and descale
18、d if necessary; or hot rolled, annealed, and descaled having hardness not higher than 36 HRC, or equivalent (see 8.2). 3.3.2 Plate Hot rolled, annealed, and descaled having hardness not higher than 36 HRC, or equivalent (see 8.2). 3.3.2.1 If allowed by the purchaser, cold rolled, annealed, and desca
19、led having hardness not higher than 36 HRC, or equivalent (see 8.2). 3.3.3 When normalized and tempered product is ordered, hardness shall be not higher than 40 HRC, or equivalent (see 8.2). 3.4 Heat Treatment Shall be as follows; pyrometry shall be in accordance with AMS2750: 3.4.1 Annealing Produc
20、t shall be annealed by heating to 1250 F 25 F (677 C 14 C), holding at heat for 4 hours 0.25 hour, air cooling to room temperature, reheating to 1150 F 25 F (621 C 14 C), holding at heat for 8 hours 0.25 hour, and cooling in air to room temperature. 3.4.2 Normalizing When specified by purchaser, pro
21、duct shall be normalized prior to annealing by heating to 1650 F 25 F (899 C 14 C), holding at heat for not less than 1 h/in (25 mm) of maximum thickness, but not less than 1 hour, and cooling in air to room temperature. SAE INTERNATIONAL AMS6523H Page 4 of 7 3.5 Properties The product shall conform
22、 to the following requirements; tensile testing shall be performed in accordance with ASTM A370: 3.5.1 Macrostructure of Each Heat Visual examination of full transverse cross-sections of slab, billet or suitable rerolled product, etched in hot hydrochloric acid in accordance with ASTM A604, shall sh
23、ow no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM A604 shown in Table 2. Table 2 - Macrostructure limits Condition Class Severity Freckles White Spots Radial Segregation Ring Pattern 1 2 3 4 A A B B 3.5.2 Micro-Inclusion R
24、ating No specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E45, Method D. Table 3 - Micro-inclusion rating limits A Thin A Heavy B Thin B Heavy C Thin C Heavy D Thin D Heavy Worst Field Severity Worst Field Frequency, max Total Rateable Fields Frequency, max 1.5 a
25、 b 1.0 1 1 1.5 a b 1.0 1 1 1.5 a b 1.0 1 1 1.5 3 8 1.0 1 1 a - Combined A+B+C, not more than 3 fields b - Combined A+B+C, not more than 8 fields 3.5.2.1 A rateable field is defined as one that has a type A, B, C, or D inclusion rating of at least 1.0 thin or heavy in accordance with ASTM E45 (see 8.
26、4). 3.5.3 Average Grain Size of Each Lot Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112. 3.5.4 Decarburization of Each Lot Decarburization shall be evaluated by one of the methods of 3.5.4.1 or 3.5.4.2. 3.5.4.1 Metallographic Method A cross section taken perpendicular to the s
27、urface shall be prepared, etched, and visually examined metallographically at a magnification not to exceed 100X. Optical indications of decarburiztion shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Table 4. 3.5.4.2 Hardness Traverse Method The total
28、depth of decarburization shall be determined by a traverse method using microindentation hardness testing in accordance with ASTM E384, at a magnification not exceeding 100X, conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content.
29、 Depth of decarburization is defined as the perpendicular distance from the surface to the depth under that surface where there is not further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any decarburization on the adjacent surface.
30、 Acceptance shall be as listed in Table 4. SAE INTERNATIONAL AMS6523H Page 5 of 7 Table 4 Table 4A - Maximum decarburization, inch/pound units Nominal Thickness Inches Total Depth of Decarburization Inch Up to 0.500, incl Over 0.500 to 1.000, incl Over 1.000 0.015 0.025 0.035 Table 4B - Maximum deca
31、rburization, SI units Nominal Thickness Millimeters Total Depth of Decarburization Millimeter Up to 12.70, incl Over 12.70 to 25.40, incl Over 25.40 0.38 0.64 0.89 3.5.4.3 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such a
32、reas does not exceed the above limits by more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.65 mm) or less. 3.5.4.4 In the case of dispute, the total depth of decarburization determined using the microindentation hardness traverse method shall govern. 3.5.5 Properties After Normalizing, H
33、ardening, Sub-Zero Cooling, and Double Tempering Heat Treatment Product shall meet the following properties after being normalized by heating to 1650 F 25 F (899 C 14 C), holding at heat for 1 h/in (25 mm) of maximum cross-section, and cooling in air to room temperature; hardened by heating to 1525
34、F 25 F (829 C 14 C), holding at heat for 1 h/in (25 mm) of maximum cross-section but not less than 1 hour, and quenching in oil or water; cooling to 100 F 10 F (73 C 6 C) within 2 hours, holding at 100 F 10 F (73 C 6 C) for not less than 2 hours, warming to room temperature; and double tempered by h
35、eating to 1035 F 15 F (557 C 8 C), holding at heat for 2 h/in (25 mm) of maximum cross-section, but not less than 2 hours, cooling to approximately 125 F (52 C), reheating to 1035 F 15 F (557 C 8 C), holding at heat for 2 h/in (25 mm) of maximum cross-section, but not less than 2 hours, and cooling
36、in air to room temperature. If the first temper cannot be performed within 2 hours of subzero treatment, snap temper the product at 350 to 450 F (177 to 232 C) for 2 h/in (25 mm) of thickness. Normalizing may be omitted if the product was supplied normalized or annealed. Heat treating equipment and
37、controls shall be in accordance with AMS2759. 3.5.5.1 Tensile Properties Shall be as shown in Table 5. Table 5 Table 5A - Minimum tensile properties, inch/pound units Nominal Thickness Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 Inches or 4D % Reduction of Area % Up
38、 to 0.250, excl 0.250 and over 190 190 175 175 5 10 45 45 SAE INTERNATIONAL AMS6523H Page 6 of 7 Table 5B - Minimum tensile properties, SI units Nominal Thickness Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % Reduction of Area % Up to 6.35, excl 6.3
39、5 and over 1310 1310 1207 1207 5 10 45 45 3.5.5.2 Hardness Shall be 41 to 46 HRC, or equivalent (see 8.2). 3.5.5.3 Fracture Toughness When specified, the product shall be subject to fracture toughness testing. There is no recognized standard for fracture toughness testing of sheet, strip, and plate
40、under 1/2 inch thick. Method of test and acceptance standards shall be as specified by the purchaser. Procedure for thicker product shall conform to ASTM E399 or, when permitted by purchaser, ASTM E1304. Results of tests on sheet and strip over 4 inches (102 mm) wide and plate less than 1.50 inches
41、(38.1 mm) in thickness shall be reported. Plate over 1.50 inch (38.1 mm) in thickness shall have fracture toughness not less than 120 ksi (132 MPa ) in the longitudinal direction (LT) and 110 ksi (121 MPa ) in the long-transverse (TL) direction. 3.6 Quality The product, as received by purchaser, sha
42、ll be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product. 3.6.1 Steel shall be premium aircraft-quality conforming to AMS2300. 3.7 Tolerances Shall be in accordance with AMS2252. 4. QUALITY ASSURANCE PROVISIONS 4.1 Resp
43、onsibility for Inspection The producer of the product shall supply all samples for producers 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 t
44、o specified requirements. 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 AMS2370. 4.4 Reports The producer of the product shall furnish with each shipment a rep
45、ort showing the producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations), results of tests for composition, macrostructure, micro-inclusion rating, and frequency-severity cleanliness rating of each heat and for average gra
46、in size, tensile properties, hardness, and, when specified, fracture toughness of each lot after normalizing, hardening, subzero cooling, and double tempering, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot
47、 numbers, AMS6523H, product form, size, and quantity. inch m inch mSAE INTERNATIONAL AMS6523H Page 7 of 7 4.5 Resampling and Retesting Shall be in accordance with AMS2370. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS2807. 5.2 Protective Treatment The product shall b
48、e protected from corrosion prior to shipment. 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
49、and safe delivery. 6. ACKNOWLEDGMENT A producer shall include this specification number and its revision letter 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 Revision Indicator A change bar (I) lo
