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/AMS6276KAEROSPACEMATERIALSPECIFICATIONAMS6276 REV. K Issued 1942-09 Revised 2011-06Supersedin
5、g AMS6276J Steel, Bars, Forgings, and Tubing 0.50Cr - 0.55Ni - 0.20Mo (0.18 - 0.23C) (SAE 8620) Consumable Electrode Vacuum Remelted (Composition similar to UNS G86200)RATIONALE AMS6276K results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers a p
6、remium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock. 1.2 Application These products have been used primarily for critical carburized parts subject to rigid magnetic particle inspection standards requiring high minimum core hardness with wide r
7、ange in sections 0.375 inch (9.52 mm) and under in nominal thickness. The core may or may not be machinable after hardening. 2. APPLICABLE DOCUMENTS 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
8、 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 shall apply. 2.1 SAE Publications Available from SAE Inte
9、rnational, 400 Commonwealth Drive, Warrendale, 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
10、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 Forging Stock Copyright SAE International Provided by IHS under license with SAENot for ResaleNo
11、reproduction or networking permitted without license from IHS-,-,-SAE AMS6276K Page 2 of 7 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-Resista
12、nt 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 International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-295
13、9, 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 45 Determining the Inclusion Content of Steel ASTM E 112 Determining Average Gr
14、ain 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 accordance with ASTM E 350, by s
15、pectrochemical methods, or by other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max Carbon 0.18 0.23 Manganese 0.70 1.00Silicon 0.15 0.35 Phosphorus - 0.012Sulfur - 0.010Chromium 0.40 0.60 Nickel 0.40 0.70Molybdenum 0.15 0.25 Copper - 0.353.1.1 Check Analysis Compos
16、ition variations shall meet the applicable requirements of AMS2259. 3.2 Melting Practice Steel shall be multiple melted using vacuum consumable electrode practice in the remelt cycle. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permit
17、ted without license from IHS-,-,-SAE AMS6276K Page 3 of 7 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 be cut from plate. 3.3.1.1 Bars 0.500 Inch (12.70 mm) and Under
18、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 Distance Between Parallel Sides Hot finished and annealed, unle
19、ss otherwise ordered, 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 ordered, having hardness not higher than
20、25 HRC, or equivalent (See 8.3). Tubing ordered hot finished and annealed shall have hardness not higher than 99 HB, or equivalent (See 8.3). 3.3.4 Forging Stock As ordered by the forging manufacturer. 3.4 Properties The product shall conform to the following requirements; hardness testing shall be
21、performed in accordance with ASTM A 370: 3.4.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets, tube rounds or forging stock, etched in hot hydrochloric acid in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and oth
22、er imperfections shall be no worse than the macrographs of ASTM A 604 shown in Table 2. TABLE 2 - MACROSTRUCTURE LIMITS Class Condition Severity 1 Freckles A 2 White Spots A 3 Radial Segregation B 4 Ring Pattern B 3.4.1.1 If tubes are produced directly from ingots or large blooms, transverse section
23、s may be taken from tubes rather than tube rounds. Macroetch standards for such tubes shall be as agreed upon by purchaser and vendor. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6276K Pag
24、e 4 of 7 3.4.2 Micro-Inclusion Rating of Each Heat No specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E 45, Method D. TABLE 3 - MICRO-INCLUSION RATING LIMITS A Thin AHeavy BThin BHeavy CThin CHeavy DThin DHeavy Worst Field Severity 1.5 1.0 1.5 1.0 1.5 1.0 1.5 1.
25、0 Total Rateable Fields, Frequency, maximum 8 1 3 1 3 1 5 1 3.4.2.1 A ratable field is defined as one that has Type A, B, C, or D inclusion rating of at least No. 1.0 thin or heavy in accordance with Jernkontoret chart, Plate -r, ASTM E 45. 3.4.3 Average Grain Size of Bar, Forgings and Tubing Shall
26、be ASTM No. 5 or finer, determined in accordance with ASTM E 112. 3.4.4 Hardenability of Each Heat Shall be J1/16 inch (1.6 mm) = 48 HRC maximum and J 3/16 (4.8 mm) = 32 HRC minimum, determined on the standard end-quench test specimen in accordance with ASTM A 255, except that the steel shall be nor
27、malized at 1700 F 10 (927 C 6) and austenitized at 1700 F 10 (927 C 6). 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 premium aircra
28、ft-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 removal allowance in accordance with AS1182, be free from seams, laps, tears, and cracks exposed to the ground, turned, or pol
29、ished 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 reentrant grain flow. 3.6 Tolerances 3.6.1 Bars In accordance with AMS2251. 3.6.2 Mechanical Tubing In accordance with AMS2253.
30、4. QUALITY 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 perform any confirmatory testing deemed necessary to e
31、nsure that the product conforms to specified requirements. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6276K Page 5 of 7 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1
32、), condition (3.3), macrostructure (3.4.1), micro-inclusion rating (3.4.2), average grain size (3.4.3), hard-enability (3.4.4), 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 g
33、rain 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, Mechanical Tubing, and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In accordance
34、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, micro-inclusion rating and hardenability of each heat and for condition and average grain size of each lot, and stating that
35、 the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6276K, product form and size (and/or part number, if applicable), and quantity. If forgings are supplied, the size and melt source of stock used to make the forgin
36、gs 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 showing the results of tests for composition, macrostructure, micro-incl
37、usion rating, 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, AMS6276K, size and quantity. 4.5 Resampling and Retesting 4.5.1 Bars, Mechanical Tubing, and Forging Stock In accorda
38、nce with AMS2370. 4.5.2 Forgings In accordance with AMS2372. 5. PREPARATION FOR DELIVERY 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 sh
39、all be supplied in lengths shorter than 10 feet (3 m). Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6276K Page 6 of 7 5.2 Identification 5.2.1 Bars and Mechanical Tubing In accordance with
40、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 corrosion prior to shipment. 5.4 Packaging The prod
41、uct 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 vendor shall include this spe
42、cification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTION 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 th
43、e 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 technical revisions. Change bars and (R) are n
44、ot 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 are clarified in ARP1917. 8.5 Dimensions and
45、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 presented only for information. Copyright SAE International Provided by IHS under licen
46、se with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6276K Page 7 of 7 8.6 Purchase documents should specify not less than the following: AMS6276K Product form and size (and/or part number, if applicable) of product desired Quantity of product desired
47、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-,-,-
