SAE AMS 6276L-2016 Steel Bars Forgings and Tubing 0 50Cr - 0 55Ni - 0 20Mo (0 18 - 0 23C) (SAE 8620) Consumable Electrode Vacuum Remelted (UNS G86200).pdf

1、_ SAE TeFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUWLVSXEOLVKHG E6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDODQGHQJLQHHULQ g sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including aQSDWHQWLQIULQJHPHQWDULVLQJWKHUHIURPLVWKHVROHUHVSRQVLELOL

2、WR IWKHXVHU 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 publication may be reproduced, store

3、d 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 USA) Fax: 724-776-0790 E

4、mail: 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/AMS6276L AEROSPACE MATERIAL SPECIFICATION AMS6276 REV. L Issued 1942-09 Revised 2016-06 Superseding AMS6276L Steel,

5、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 AMS6276L results from a Five Year Review and update of this specification that revises microcleanliness testing methods and reporting. 1. S

6、COPE 1.1 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 primarily for critical carburized parts subject to rigid magnetic particle inspection standards requi

7、ring high minimum core hardness with wide range in sections 0.375 inch (9.52 mm) and under in nominal thickness, but usage is not limited to such applications. 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

8、 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 has been specified, the last

9、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.sae.org. AMS2251 Tolerances Low-Alloy Steel Bars AMS2253 Tolerances,

10、 Carbon and Alloy Steel Tubing AMS2259 Chemical Check Analysis Limits Wrought Low-Alloy and Carbon Steels SAE INTERNATIONAL AMS6276L Page 2 of 7 AMS2300 Steel Cleanliness, Premium Aircraft-Quality Magnetic Particle Inspection Procedure AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-A

11、lloy 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 AMS2808 Identification Forg

12、ings 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, P.O. Box C700, West Consh

13、ohocken, 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 E45 Determining the Inclusion Content of Steel ASTM E112 Deter

14、mining Average Grain Size 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, determ

15、ined by wet chemical methods in accordance with ASTM E350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element min max Carbon 0.18 0.23 Manganese 0.70 1.00 Silicon 0.15 0.35 Phosphorus - 0.012 Sulfur - 0.010 Chromium 0.40 0.60 Nickel 0.40

16、 0.70 Molybdenum 0.15 0.25 Copper - 0.35 SAE INTERNATIONAL AMS6276L Page 3 of 7 3.1.1 Check Analysis Composition 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. 3.3 Condi

17、tion 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 Between Paral

18、lel 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, unless otherwise ordered, having hardness not higher th

19、an 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 25 HRC, or equivalent (see 8.3). Tubing ordered hot

20、 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 performed in accordance with ASTM A370: 3.4.1 Macro

21、structure Visual examination of transverse full cross-sections from bars, billets, tube rounds or 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 no worse than the macrograp

22、hs of ASTM A604 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 SAE INTERNATIONAL AMS6276L Page 4 of 7 3.4.1.1 If tubes are produced directly from ingots or large blooms, transverse sections may be taken

23、from tubes rather than tube rounds. Macroetch standards for such tubes shall be as agreed upon by purchaser and producer. 3.4.2 Micro-Inclusion Rating of Each Heat No specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E45, Method D. Table 3 - Micro-inclusion rating

24、 limits A Thin A Heavy B Thin B Heavy C Thin C Heavy D Thin D Heavy Worst Field Severity 1.5 1.0 1.5 1.0 1.5 1.0 1.5 1.0 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

25、in accordance with ASTM E45. 3.4.3 Average Grain Size of Bar, Forgings and Tubing Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112. 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

26、-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 austenitized at 1700 F 10 F (927 C 6 C). 3.5 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials a

27、nd 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, tears, and cracks after removal of the standard stock removal allowance in accordance with AS1182. 3.5.3 Gr

28、ain 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. SAE INTERNATIONAL AMS62

29、76L Page 5 of 7 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply DOOVDPSOHVIRUSURGXFHUVWHVWVDQGVKDOOEHUHVSRQVLEOHIRUWKHSHUIRUPDQFHRI DOOrequired tests. Purchaser reserves the right to sample and perform any confirmatory testing deemed necessa

30、ry 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), micro-inclusion rating (3.4.2), average grain size (3.4.3), hard-enability (3.4.4), and tolerances (3.6) are acceptance tes

31、ts 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 a frequency selected by the producer unless frequency of testing is specified by purchas

32、er. 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 shall furnish with each shipment a report showing the producer identity, country where the

33、metal was melted (e.g., final melt in the case of metal processed by multiple melting operations), 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 the product conforms to th

34、e other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6276L, 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 forgings shall also be included.

35、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 identity, country where the metal was melted (e.g., final melt in the c

36、ase of metal processed by multiple melting operations), results of tests for composition, macrostructure, micro-inclusion 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, A

37、MS6276L, 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 AMS6276L Page 6 of 7 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exac

38、t 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 Tubing In accordance with AMS2806. 5.2.2 Forg

39、ings 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. 5.4 Packaging The product shall be prep

40、ared 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 producer shall include this specification numb

41、er 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 Revision Indicator A change bar (l) located in the left margin is fo

42、r 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 technical revisions. Change bars and (R) a

43、re 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 are clarified in ARP1917. SAE INTERNATIONAL

44、 AMS6276L 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 presented only for information. 8.6 Purchase d

45、ocuments should specify not less than the following: AMS6276L 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 COMM,77(