SAE AMS 6277H-2016 Steel Bars Forgings and Tubing 0 50Cr - 0 55Ni - 0 20Mo (0 18 - 0 23C) (SAE 8620) Vacuum Arc or Electroslag Remelted (UNS G86200).pdf

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 2016 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/AMS6277H AEROSPACE MATERIAL SPECIFICATION AMS6277 REV. H Issued 1963-07 Revised 2

5、016-06Superseding AMS6277G 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 AMS6277H results from a Five Year Review and update of this specification that revises reporting. 1. SCOPE 1

6、.1 Form This specification covers a premium 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 un

7、der in nominal thickness, and that are 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 Multi

8、ple melted using electroslag (ESR) remelting 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 documen

9、ts 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 been cancelled and no superseding document ha

10、s been specified, the last published issue of that document shall apply. SAE INTERNATIONAL AMS6277H Page 2 of 7 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.sa

11、e.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, Premium Aircraft-Quality Magnetic Particle Inspection Procedure AMS2370 Quality Assurance Sampling an

12、d 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 Tubing, and Extrusions Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys

13、AMS2808 Identification Forgings ARP1917 Clarification of Terms Used in Aerospace Metals Specifications 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 Barr Harbor Drive

14、, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A255 Determining Hardenability of Steel ASTM A370 Mechanical Testing of Steel Products ASTM A604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets ASTM E112 Determining Average Grain Size

15、 ASTM E140 Hardness Conversion Tables for Metals ASTM E350 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 meth

16、ods in accordance with ASTM E350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. SAE INTERNATIONAL AMS6277H Page 3 of 7 Table 1 - Composition Element min max Carbon Manganese Silicon Phosphorus Sulfur Chromium Nickel Molybdenum Copper 0.18 0.70 0.15 - - 0.40 0.40

17、 0.15 - 0.23 1.00 0.35 0.012 0.010 0.60 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 be multiple melted using either electroslag or consumable electrode vacuum arc practice for the remelt cycle (see 1.3

18、). 3.3 Condition The product shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A370: 3.3.1 Bars Bar shall not be cut from plate (also see 4.4.2). 3.3.1.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance B

19、etween 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 Distance Between Parallel Sides Hot finished and annealed having hardness not higher than 229 HB, or e

20、quivalent (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 ordered, having hardness not higher than 25 HRC, or equivalent (see 8.3). Tubing ordered hot finished and a

21、nnealed shall have hardness not higher than 99 HRB, or equivalent (see 8.3). 3.3.4 Forging Stock As ordered by the forging manufacturer. SAE INTERNATIONAL AMS6277H Page 4 of 7 3.4 Properties The product shall conform to the following requirements; hardness testing shall be performed in accordance wi

22、th ASTM A370: 3.4.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets, tube rounds, and forging stock, etched in hot hydrochloric acid in accordance with ASTM A604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be

23、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 Radial segregation Ring pattern A A B B 3.4.1.1 If tubes are produced directly from ingots or large blooms, transverse sections may be taken from tubes r

24、ather than tube rounds. Macrostructure standards for such tubes shall be as agreed upon by purchaser and producer. 3.4.2 Average Grain Size of Bar, Forgings and Tubing Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112. 3.4.3 Hardenability of Each Heat Shall be J 1/16 inch (1.6 mm

25、) = 48 HRC maximum and J 3/16 inch (4.8 mm) = 32 HRC minimum, determined on the standard end-quench test specimen in accordance with ASTM A255 except that the steel shall be normalized at 1700 F 10 F (927 C 6 C) and the test specimen austenitized 1700 F 10 F (927 C 6 C). 3.5 Quality The product, as

26、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 premium aircraft-quality conforming to AMS2300. 3.5.2 Bars and mechanical tubing shall be free from seams, laps, t

27、ears, 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 that contain flash line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow. 3.6 Tolerances 3.6.1 Ba

28、rs In accordance with AMS2251. 3.6.2 Mechanical Tubing In accordance with AMS2253. SAE INTERNATIONAL AMS6277H Page 5 of 7 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests and shall be responsible for the perfor

29、mance 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 (3.3) macrostructure (3.4.1), av

30、erage grain size (3.4.2), hardenability (3.4.3), and tolerances (3.6) are acceptance tests and shall be performed on each heat or 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

31、a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing 4.3.1 Bars, Mechanical Tubing, and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In accordance with AMS2372. 4.4 Reports 4.4.1 The producer of bars, forgings and tubing sha

32、ll furnish with each shipment a report 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, and hardenability of each heat, and for condition and average g

33、rain 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, AMS6277H, product form and size (and/or part number, if applicable), and quantity. If forgings are supplied, the size and melt

34、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). 4.4.3 The producer of forging stock shall furnish with each shipment a report showing the producer ident

35、ity, 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, and hardenability of each heat and the results of any additional property requirements imposed by 8.6. This report shall include

36、the purchase order number, heat number, AMS6277H, size and quantity. 4.5 Resampling and Retesting 4.5.1 Bars, Mechanical Tubing, and Forging Stock In accordance with AMS2370. 4.5.2 Forgings In accordance with AMS2372. SAE INTERNATIONAL AMS6277H Page 6 of 7 5. PREPARATION FOR DELIVERY 5.1 Sizes Excep

37、t 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 Bars and Mechanical Tubin

38、g 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 Protective Treatment Bars and mechanical tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment.

39、 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. ACKNOWLEDGMENT A produc

40、er 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

41、 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 t

42、echnical 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 A370. 8.3 Hardness conversion tables for metals are presented in ASTM E140. 8.4 Terms used in AMS ar

43、e clarified in ARP1917. SAE INTERNATIONAL AMS6277H Page 7 of 7 8.5 Dimensions and properties 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 prese

44、nted only for information. 8.6 Purchase documents should specify not less than the following: AMS6277H Product form and size (and/or part number, if applicable) of 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”