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 2015 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/AMS5621G AEROSPACE MATERIAL SPECIFICATION AMS5621 REV. G Issued 1952-11 Reaffirme
5、d 2006-04 Revised 2015-07 Superseding AMS5621F Steel, Corrosion Resistant, Bars, Wire, and Forgings 13Cr (0.30-0.40C) (51420) Annealed (Composition similar to UNS S42000) RATIONALE AMS5621G revises Decarburization (3.3.2.4) and Reports (4.4), and is a Five Year Review and update of this specificatio
6、n. 1. SCOPE 1.1 Form This specification covers a corrosion-resistant steel in the form of bars, wire, forgings, and forging stock. 1.2 Application These products have been used typically for parts requiring corrosion resistance and oxidation resistance up to 800 F (427 C) and hardness at room temper
7、ature within the range 40 to 55 HRC when heat treated, but usage is not limited to such applications. 1.2.1 Certain design and processing procedures may cause these products to become susceptible to stress-corrosion cracking; ARP1110 recommends practices to minimize such conditions. 2. APPLICABLE DO
8、CUMENTS 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 bee
9、n 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 Canada) or +1 724-776-4970 (outside USA), www
10、.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 Alloys SAE INTERNATIONAL AMS5621G Page 2
11、 of 7 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 Ex
12、trusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys AMS2808 Identification Forgings ARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion Resistant Steels and Alloys AS1182 Standard Stock Removal Allowance Aircraft-Quality and Premium
13、Aircraft-Quality Steel Bars and Mechanical Tubing 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 E353 Chemical Analysis of Stainless,
14、 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, by spectr
15、ochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element min max Carbon Manganese Silicon Phosphorus Sulfur Chromium Nickel Molybdenum Copper Aluminum Tin 0.30 - - - - 12.00 - - - - - 0.40 1.00 1.00 0.040 0.030 14.00 0.50 0.50 0.50 0.05 0.05 3.1.1 Chec
16、k 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 A370: SAE INTERNATIONAL AMS5621G Page 3 of 7 3.2.1 Bars Annealed havi
17、ng hardness not higher than 241 HB, or equivalent (See 8.2). 3.2.1.1 All hexagons regardless of size, and other bars 2.750 inches (69.85 mm) and under in nominal diameter or least distance between parallel sides shall be cold finished. 3.2.1.2 Bars, other than hexagons, over 2.750 inches (69.85 mm)
18、in nominal diameter or least distance between parallel sides shall be hot finished or cold finished. 3.2.2 Wire Cold drawn and annealed having tensile strength not higher than 115 ksi (793 MPa), or equivalent hardness (See 8.3). 3.2.3 Forgings As ordered. 3.2.4 Forging Stock As ordered by the forgin
19、g manufacturer. 3.3 Properties The product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A370: 3.3.1 Response to Heat Treatment Product 0.500 inch (12.70 mm) and under in nominal thickness and 0.500 inch 0.100 (12.70 mm 2.54) thick specimens
20、 cut from larger bars and forgings shall have hardness not lower than 50 HRC, or equivalent (See 8.2), after being heated to 1825 F 25 (996 C 14), held at heat for 30 minutes 3, and cooled at a rate equivalent to still air cooling. 3.3.2 Decarburization 3.3.2.1 Bars and wire ordered ground, turned,
21、or polished shall be free from decarburization on the ground, turned, or polished surfaces. 3.3.2.2 Allowable decarburization of bars and billets ordered for redrawing or forging or to specified microstructural requirements shall be as agreed upon by purchaser and producer (See 8.6). 3.3.2.3 Decarbu
22、rization of bars and wire to which 3.3.2.1 or 3.3.2.2 is not applicable shall be not greater than shown in Table 2. Table 2A - Maximum total depth of decarburization, inch/pound units Nominal Diameter or Distance Between Parallel Sides Inches Total Depth of Decarburization Inch Up to 0.375, incl Ove
23、r 0.375 to 0.500, incl Over 0.500 to 0.625, incl Over 0.625 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 0.012 0.014 0.017 0.020 0.025 0.030 0.035 0.045 SAE INTERNATIONAL AMS5621G Page 4 of 7 Ta
24、ble 2B - Maximum total depth of decarburization, SI units Nominal Diameter or Distance Between Parallel Sides Millimeters Total Depth of Decarburization Millimeters Up to 9.52, incl Over 9.52 to 12.70, incl Over 12.70 to 15.88, incl Over 15.88 to 25.40, incl Over 25.40 to 38.10, incl Over 38.10 to 5
25、0.80, incl Over 50.80 to 63.50, incl Over 63.50 to 76.20, incl Over 76.20 to 101.60, incl 0.25 0.30 0.36 0.43 0.51 0.64 0.76 0.89 1.14 3.3.2.4 Decarburization shall be evaluated by one of two methods of 3.3.2.4.1 or 3.3.2.4.2. 3.3.2.4.1 Metallographic Method A cross section taken perpendicular to th
26、e surface shall be prepared, etched, and visually examined metallographically at a magnification not to exceed 100X. Optical indications of decarburization (including complete decarburization (ferrite) plus partial decarburization) shall not exceed the limits of Table 2. 3.3.2.4.2 Hardness Traverse
27、Method The total depth of decarburization shall be determined by a traverse method using micro hardness testing in accordance with ASTM E384 at a magnification not exceeding 100 X conducted on a sample heat treated in accordance with 3.3.1; the sample will have been protected during heat treatment t
28、o prevent changes in surface carbon content. Depth of decarburization is defined as the perpendicular distance from the surface to the depth under that surface where there is no further increase in hardness. Such measurements shall be far enough away from the adjacent surface to be uninfluenced by a
29、ny decarburization on the adjacent surface. Acceptance shall be as listed in Table 2. 3.3.2.4.2.1 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the limits of Table 2 by more than 0.005 inch (0.13 m
30、m) and the width is 0.065 inch (1.65 mm) or less. 3.3.2.5 In case of dispute, the total depth of decarburization determined using the micro hardness traverse method shall govern. 3.4 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreig
31、n 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 shall, after the removal of the standard machining allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the
32、ground, turned, or polished surface. 3.4.2 Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow. 3.5 Tolerances Bars and wire shall conform to all applicable requirements of AMS224
33、1. SAE INTERNATIONAL AMS5621G Page 5 of 7 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producer tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perfor
34、m 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 (3.2), response to heat treatment (3.3.1), decarburization (3.3.2), and tolerances (3.5) are acceptance tests and
35、 shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Grain flow of die forgings (3.4.2) is a periodic test and shall be performed at a frequency selected by the producer unless the frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be as follows: 4.
36、3.1 Bars, Wire, and Forging Stock In accordance with AMS2371. 4.3.2 Forgings In accordance with AMS2374. 4.4 Reports 4.4.1 The producer of bars, wire and forgings shall furnish with each shipment a report showing the producers name and country where the metal was melted (e.g., final melt in the case
37、 of metal processed by multiple melting operations) and showing the results of tests for composition of each heat and for condition and response to heat treatment for each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order num
38、ber, heat and lot numbers, AMS5621G, product form, size, and quantity. If forgings are supplied, the size and melt source of forging stock used to make the forgings shall also be included. 4.4.2 The producer of forging stock shall furnish with each shipment a report showing the producers name and co
39、untry where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and the composition of each heat. 4.5 Resampling and Retesting Shall be as follows: 4.5.1 Bars, Wire, and Forging Stock In accordance with AMS2371. 4.5.2 Forgings In accordance with AMS2
40、374. SAE INTERNATIONAL AMS5621G Page 6 of 7 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when except lengths or multiples of exact lengths are ordered, straight bars and wire will be acceptable in mill lengths of 6 to 20 feet (1.8 to 6.1 m) but not more than 10% of any shipment shall be supplied in
41、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 by purchaser and producer. 5.3 Packaging The product shall be prepared for shipment in accordance
42、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. ACKNOWLEDGMENT A producer shall mention this specification number and its revision letter in al
43、l 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 wh
44、ere 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 (R) are not used in original publications, nor in docum
45、ents that contain editorial changes only. 8.2 Hardness conversion tables for metals are presented in ASTM E140. 8.3 Tensile strengths to hardness conversions are presented in ASTM A370. 8.4 Terms used in AMS are clarified in ARP1917. SAE INTERNATIONAL AMS5621G Page 7 of 7 8.5 Dimensions and properti
46、es 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: AMS5621G Product form and size or part number of product desired If stock for redrawing or forging, allowable decarburization limits (See 3.3.2.2) Quantity of product desired. PREPARED BY AMS COMMITTEE “F“
