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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication m
3、ay 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 (outside U
4、SA) 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/AMS6277GAEROSPACEMATERIALSPECIFICATIONAMS6277 REV. G Issued 1963-07 Revised 2011-06Supersedin
5、g AMS6277F Steel, Bars, Forgings, and Tubing 0.50Cr - 0.55Ni - 0.20Mo (0.18 - 0.23C) (SAE 8620) Vacuum Arc or Electroslag Remelted (Composition similar to UNS G86200) RATIONALE AMS6277G results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers a pr
6、emium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock. 1.2 Application These products have been used typically for carburized parts requiring high minimum core hardness in sections 0.375 inch (9.52 mm) and under in nominal thickness, and that are
7、 subject to rigid magnetic particle standards, but usage is not limited to such applications. The core may or may not be machinable after hardening. 1.3 Classification Steel covered by this specification is classified by melting practice as follows: Type 1 Multiple melted using electroslag (ESR) rem
8、elting in the final melt cycle. Type 2 Multiple melted using consumable electrode vacuum arc (VAR) remelting in the final melt cycle. 1.3.1 Unless a specific type is ordered, either type may be supplied. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purcha
9、se 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 document has been specified, the last published i
10、ssue of that document shall apply. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6277G Page 2 of 7 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale,
11、PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2251 Tolerances, Low-Alloy Steel Bars AMS2253 Tolerances, Carbon and Alloy Steel Tubing AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2300 Steel Cleanliness, Premiu
12、m Aircraft-Quality, Magnetic Particle Inspection Procedure AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Forgings AMS2806 Identification, Bars, Wire, Mechanical
13、Tubing, and Extrusions, 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 Intern
14、ational, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM A 255 Determining Hardenability of Steel ASTM A 370 Mechanical Testing of Steel Products ASTM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets ASTM E 1
15、12 Determining Average Grain Size ASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accorda
16、nce with ASTM E 350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6277G Page 3 of 7 TABLE 1 - COMPOSITION
17、 Element min max Carbon Manganese SiliconPhosphorus SulfurChromium Nickel Molybdenum Copper 0.18 0.70 0.15 - - 0.40 0.40 0.15 - 0.23 1.00 0.35 0.0120.0100.60 0.70 0.25 0.35 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Melting Practice Steel shall
18、 be multiple melted using either electroslag or consumable electrode vacuum arc practice for the remelt cycle (See 1.3). 3.3 Condition The product shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A 370: 3.3.1 Bars Bar shall not b
19、e cut from plate. 3.3.1.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides Cold finished having tensile strength not higher than 125 ksi (862 MPa), or equivalent hardness (See 8.2). 3.3.1.2 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least
20、Distance Between Parallel Sides Hot finished and annealed having hardness not higher than 229 HB, or equivalent (See 8.3). Bars ordered cold finished may have hardness as high as 248 HB, or equivalent (See 8.3). 3.3.2 Forgings As ordered. 3.3.3 Mechanical Tubing Cold finished, unless otherwise order
21、ed, having hardness not higher than 25 HRC, or equivalent (See 8.3). Tubing ordered hot finished and annealed shall have hardness not higher than 99 HRB, or equivalent (See 8.3). 3.3.4 Forging Stock As ordered by the forging manufacturer. Copyright SAE International Provided by IHS under license wit
22、h SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6277G Page 4 of 7 3.4 Properties The product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A 370: 3.4.1 Macrostructure Visual examination of trans
23、verse full cross-sections from bars, billets, tube rounds, and forging stock, etched in hot hydrochloric acid in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM A 604 shown in Table 2.
24、 TABLE 2 - MACROSTRUCTURE LIMITS Class Condition Severity 1234Freckles White spots Radial segregation Ring pattern AABB3.4.1.1 If tubes are produced directly from ingots or large blooms, transverse sections may be taken from tubes rather than tube rounds. Macrostructure standards for such tubes shal
25、l be as agreed upon by purchaser and vendor. 3.4.2 Average Grain Size of Bar, Forgings and Tubing Shall be ASTM No. 5 or finer, determined in accordance with ASTM E 112. 3.4.3 Hardenability of Each Heat Shall be J 1/16 inch (1.6 mm) = 48 HRC maximum and J 3/16 inch (4.8 mm) = 32 HRC minimum, determi
26、ned on the standard end-quench test specimen in accordance with ASTM A 255 except that the steel shall be normalized at 1700 F 10 (927 C 6) and the test specimen austenitized 1700 F 10 (927 C 6). 3.5 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and
27、 free from foreign materials and from imperfections detrimental to usage of the product. 3.5.1 Steel shall be premium aircraft-quality conforming to AMS2300. 3.5.2 Bars and mechanical tubing ordered hot rolled or cold drawn, or ground, turned, or polished shall, after removal of the standard stock r
28、emoval allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the ground, turned, or polished surface. 3.5.3 Grain flow of die forgings, except in areas that contain flash line end grain, shall follow the general contour of the forgings showing no evidence of reentr
29、ant grain flow. 3.6 Tolerances 3.6.1 Bars In accordance with AMS2251. 3.6.2 Mechanical Tubing In accordance with AMS2253. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6277G Page 5 of 7 4. Q
30、UALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product 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 deemed necessary to en
31、sure that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), condition (3.3) macrostructure (3.4.1), average grain size (3.4.2), hardenability (3.4.3), and tolerances (3.6) are acceptance tests and shall be performed on each heat or
32、lot as applicable 4.2.2 Periodic Tests Frequency-severity cleanliness rating (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 vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing 4.3.1 Bars, Mech
33、anical Tubing, and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In accordance with AMS2372. 4.4 Reports 4.4.1 The vendor of bars, forgings and tubing shall furnish with each shipment a report showing the results of tests for composition, macrostructure, and hardenability of each heat, an
34、d for condition and average grain size of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6277G, product form and size (and/or part number, if applicable), and quantity. If forgings are
35、 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 (See 3.3.1). 4.4.3 The vendor of forging stock shall furnish with each shipment a report show
36、ing the results of tests for composition, macrostructure, and hardenability of each heat and the results of any additional property requirements imposed by 8.6. This report shall include the purchase order number, heat number, AMS6277G, size and quantity. 4.5 Resampling and Retesting 4.5.1 Bars, Mec
37、hanical Tubing, and Forging Stock In accordance with AMS2370. 4.5.2 Forgings In accordance with AMS2372. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6277G Page 6 of 7 5. PREPARATION FOR DE
38、LIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight bars and tubing 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 lengths shorter than 10 feet (3 m). 5.2 Identification 5.2.1 Bar
39、s and Mechanical Tubing In accordance with AMS2806. 5.2.2 Forgings In accordance with AMS2808. 5.2.3 Forging Stock As agreed upon by purchaser and vendor. 5.3 Protective Treatment Bars and mechanical tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosio
40、n prior to shipment. 5.4 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. ACK
41、NOWLEDGMENT A vendor 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 A change
42、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 document title indicates a complete revision of the document, including te
43、chnical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Tensile strength to hardness conversions are presented in ASTM A 370. 8.3 Hardness conversion tables for metals are presented in ASTM E 140. 8.4 Terms used in AMS a
44、re clarified in ARP1917. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6277G Page 7 of 7 8.5 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimens
45、ions 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: AMS6277G Product form and size (and/or part number, if applicable) of
46、product desired Quantity of product desired If forging stock, specify any additional property requirements beyond those reported in 4.4.3 and provide details of how to obtain the desired samples. PREPARED BY AMS COMMITTEE “E” Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
