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/AMS5618J AEROSPACE MATERIAL SPECIFICATION AMS5618 REV. J Issued 1970-11 Revised 2017-01Supersed
5、ing AMS5618H Steel, Corrosion-Resistant, Bars, Wire, and Forgings 17Cr - 0.52Mo (0.95 - 1.20C) (440C) Consumable Electrode Vacuum Melted (Composition similar to UNS S44004)RATIONALE AMS5618J revises micro-inclusion rating (3.4.2.1), Decarburization (3.4.4.4), optional response to heat treatment (3.4
6、.5.2), quality (3.5.2), reports (4.4), and is a Five-Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers a premium aircraft-quality corrosion-resistant steel in the form of bars, wire, forgings, and forging stock. 1.2 Application These products have been used ty
7、pically for anti-friction bearing components requiring resistance to both corrosion and wear and having hardness not lower than 58 HRC, 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
8、 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
9、 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 +1 724-776-4970 (outside USA), www.sae.org. AMS2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium
10、Alloy Bars and Wire AMS2248 Chemical Check Analysis Limits Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron Alloys SAE INTERNATIONAL AMS5618J Page 2 of 8 AMS2300 Steel Cleanliness, Premium Aircraft-Quality Magnetic Particle Inspection Procedure AMS23
11、71 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 Extrusions Carbon
12、 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 ARP1917 Clarification of Terms Used in Aerospace Metals Specifications 2.2 ASTM
13、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 Electrode Remelted Steel Bars and Billets ASTM E45 Determin
14、ing the Inclusion Content of Steel ASTM E112 Determining Average Grain Size ASTM E140 Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness ASTM E353 Chemical Analysis of St
15、ainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron Alloys ASTM E384 Knoop and Vickers Hardness of Materials 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 E353, b
16、y spectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element Min Max Carbon Manganese Silicon Phosphorus Sulfur Chromium Molybdenum Nickel Copper 0.95 - - - - 16.00 0.40 - - 1.20 1.00 1.00 0.020 0.010 18.00 0.65 0.75 0.50 SAE INTERNATIONAL AMS5618J
17、 Page 3 of 8 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2248. 3.2 Melting Practice Steel shall be multiple melted using vacuum consumable electrode process in the remelt cycle. 3.3 Condition The product shall be supplied in the following condition; hardn
18、ess and tensile strength shall be determined in accordance with ASTM A370: 3.3.1 Bars Annealed having hardness not higher than 255 HB, or equivalent (see 8.2). Bars shall not be cut from plate (also see 4.4.2). 3.3.1.1 Bars 2.750 inches (69.85 mm) and Under in Nominal Diameter or Least Distance Betw
19、een Parallel Sides and All Hexagons Cold finished. 3.3.1.2 Bars, Other Than Hexagons, over 2.750 inches (69.85 mm) in Nominal Diameter or Least Distance Between Parallel Sides Hot finished or cold finished. 3.3.2 Wire Annealed and cold finished having tensile strength not higher than 130 ksi (896 MP
20、a). 3.3.3 Forgings As ordered. 3.3.4 Forging Stock As ordered by the forging manufacturer. 3.4 Properties The product shall conform to the following requirements: 3.4.1 Macrostructure 3.4.1.1 Transverse Visual examination of transverse sections from bars, wire, billets, and forging stock, etched in
21、hot hydrochloric acid in accordance with ASTM A604, shall show 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 Class Condition Severity 1 2 3 4 Freckles White Spots Rad
22、ial Segregation Ring Pattern A A B B SAE INTERNATIONAL AMS5618J Page 4 of 8 3.4.1.2 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 etching as in 3.4.1.2.1, shall show no s
23、treaks longer than 1/8 inch (3.2 mm) attributable to carbide segregation. 3.4.1.2.1 The surface to be examined, 2 inches (50.8 mm) minimum by diameter or thickness, shall be polished with 180 grit or finer abrasive and etched for sufficient time to produce a dark gray background coloration. The etch
24、ant 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. 3.4.2 Micro-Inclusion Rating No specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E45, Method D. Table 3 - Micro-inclusion
25、 rating limits A Thin A Heavy B Thin B Heavy C Thin C Heavy D Thin D Heavy Worst Field Severity 2.0 1.0 1.5 1.0 1.0 1.0 1.5 1.0 Worst Field Frequency, max * 1 * 1 * 1 3 1 Total Rateable Fields Frequency, max * 1 * 1 * 1 8 1 * Combined A+B+C; not more than 3 fields * Combined A+B+C; not more than 8 f
26、ields 3.4.2.1 A rateable field is defined as one which has a type A, B, C, or D inclusion rating of at least 1.0 thin or heavy in accordance with ASTM E45. 3.4.3 Average Grain Size Shall be ASTM No. 6 or finer, determined in accordance with ASTM E112 on specimens hardened in accordance with the proc
27、edure of 3.4.5. 3.4.4 Decarburization 3.4.4.1 Bars and wire ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. 3.4.4.2 Allowable decarburization of bars, wire, and billets ordered for redrawing or forging or to specified microstructura
28、l requirements shall be agreed upon by purchaser and producer. 3.4.4.3 Decarburization of bars and wire to which 3.4.4.1 or 3.4.4.2 is not applicable shall be not greater than shown in Table 4. SAE INTERNATIONAL AMS5618J Page 5 of 8 Table 4 Table 4A Maximum total depth of decarburization, inch/pound
29、 units Nominal Diameter or Distance Between Parallel Sides Inch Total Depth of Decarburization Inch Up to 0.500, incl Over 0.500 to 1.000, incl Over 1.000 to 1.500, incl Over 1.500 to 2.000, incl Over 2.000 to 2.500, incl Over 2.500 to 3.000, incl Over 3.000 to 4.000, incl 0.010 0.015 0.020 0.025 0.
30、030 0.035 0.045 Table 4B Maximum total depth of decarburization, SI units Nominal Diameter or Distance Between Parallel Sides Millimeters Total Depth of Decarburization Millimeters Up to 12.70, incl Over 12.70 to 25.40, incl Over 25.40 to 38.10, incl Over 38.10 to 50.80, incl Over 50.80 to 63.50, in
31、cl Over 63.50 to 76.20, incl Over 76.20 to 101.60, incl 0.25 0.38 0.51 0.64 0.76 0.89 1.14 3.4.4.4 Decarburization shall be evaluated by one of the two methods of 3.4.4.4.1 or 3.4.4.4.2. 3.4.4.4.1 Metallographic Method A cross section taken perpendicular to the surface shall be prepared, etched, and
32、 visually examined metallographically at a magnification not to exceed 100X. Optical indications of decarburization shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Table 4. 3.4.4.4.2 Hardness Traverse Method The total depth of decarburization shall be
33、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. Depth of decarburization is defin
34、ed 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. Acceptance shall be as listed in
35、Table 4. 3.4.4.4.3 When determining the depth of decarbuization, it is permissable to disreguard local areas provided the decarbuization of such areas does not exceed the above limits by more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.64 mm) or less. 3.4.4.4.4 In case of dispute, the t
36、otal depth of decarburization determined using the microindentation hardness traverse method shall govern. 3.4.5 Response to Heat Treatment 3.4.5.1 Specimens as in 4.3.3, protected by suitable means or treated in a neutral atmosphere to minimize scaling and prevent either carburization or decarburiz
37、ation, shall have hardness not lower than 58 HRC, or equivalent (see 8.2), after being heated to 1925 F 25 F (1052 C 14 C), held at heat for 30 minutes 3 minutes, and quenched in oil. SAE INTERNATIONAL AMS5618J Page 6 of 8 3.4.5.2 Sub-zero cooling to -100 F 20 F (-73 C 11 C), holding at that tempera
38、ture for 2 hours 0.25 hours, and warming in air to room temperature is optional. 3.5 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. 3.5.1 Steel shall be premi
39、um aircraft-quality conforming to AMS2300. 3.5.2 Bars shall be free from seams, laps, tears, and cracks after removal of the standard stock removal allowance in accordance with AS1182. 3.5.3 Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow the general cont
40、our of the forgings showing no evidence of reentrant grain flow. 3.6 Tolerances Bars and wire shall conform to all applicable requirements of AMS2241. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests and shall
41、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 Composition (3.1), condition (3.
42、3), transverse macrostructure (3.4.1.1), micro-inclusion rating (3.4.2), average grain size (3.4.3), decarburization (3.4.4), response to heat treatment (3.4.5), and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Longitudinal macr
43、ostructure (3.4.1.2), frequency-severity ratings (3.5.1), and grain flow of die forgings (3.5.3) are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be as follows: 4.3.1 Bars, Wire, an
44、d Forging Stock In accordance with AMS2371. 4.3.2 Forgings In accordance with AMS2374. SAE INTERNATIONAL AMS5618J Page 7 of 8 4.3.3 Specimens for response to heat treatment (3.4.5) of bars, wire, and billets shall be not less than 0.375 inch (9.52 mm) in thickness. Minimum dimensions in other direct
45、ions shall be either those of the product cross-section or 1.125 x 1.125 inches (28.58 x 28.58 mm). 4.3.4 Samples for longitudinal macrostructure (3.4.1.2) testing shall be 2 inches (51 mm) long specimens taken through the center of the cross-section of the product supplied. 4.4 Reports 4.4.1 The pr
46、oducer of bar, wire or forgings shall furnish with each shipment a report showing the producers name and the country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, macrostructure, and micro-inclusi
47、on rating of each heat and for condition, average grain size, and response to heat treatment for each lot, stating if sub-zero cooling was used for response to heat treatment, and stating that the product conforms to the other technical requirements. This report shall include the purchase order numb
48、er, heat and lot numbers, AMS5618J, size, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included. 4.4.2 If the ship size/shape is cut from a larger cross-section, report the nominal metallurgically worked size (also see 3.3.1). 4.4.
49、3 The producer of forging stock shall furnish with each shipment a report showing the producers name and the country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, transverse macrostructure, micro-inclusion rating, and response to heat treatment of each heat. This report shall include the pur
