SAE AMS 6305G-2016 Steel Heat-Resistant Bars Forgings and Tubing 0 95Cr - 0 55Mo - 0 30V (0 40 - 0 50C) Vacuum Arc Remelted (UNS K14675).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:/standards.sae.org/AMS6305G AEROSPACE MATERIAL SPECIFICATION AMS6305 REV. G Issued 1973-05 Revised 2016-12Supersed

5、ing AMS6305F Steel, Heat-Resistant, Bars, Forgings, and Tubing 0.95Cr - 0.55Mo - 0.30V (0.40 - 0.50C) Vacuum Arc Remelted (Composition similar to UNS K14675)RATIONALE AMS6305G is a Five-Year Review and update of this specification that revises the test procedure for decarburization (3.4.3.5), qualit

6、y (3.5), and reporting (4.4). 1. SCOPE 1.1 Form This specification covers a premium aircraft-quality, low-alloy, heat-resistant steel in the form of bars, forgings, mechanical tubing, and forging stock. 1.2 Application These products have been used typically for parts such as compressor discs, turbi

7、ne discs, shafts, and fasteners for use in service up to 1000 F (538 C) and subject to stringent magnetic particle inspection standards, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a par

8、t 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 issue of that documen

9、t 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 Carbon and Alloy Steel Tubing S

10、AE INTERNATIONAL AMS6305G Page 2 of 8 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 and Testing Carbon and Low-Alloy Steel Wrought Products and F

11、orging 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 Forgings ARP1917 Clarification of Ter

12、ms 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 Conshohocken, PA 19428-2959, Tel: 610-

13、832-9585, www.astm.org. 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 ASTM E140 Hardness Conversion Tables for Metals ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy S

14、teel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E384 Microindentation 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 E350, by spectrochemical met

15、hods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element Min. Max. Carbon 0.40 0.50 Manganese 0.40 0.70 Silicon 0.15 0.35 Phosphorus - 0.015 Sulfur - 0.015 Chromium 0.80 1.10 Molybdenum 0.45 0.65 Vanadium 0.25 0.35 Nickel - 0.25 Copper - 0.35 Lead - 0.001 (10 ppm)

16、SAE INTERNATIONAL AMS6305G Page 3 of 8 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Melting Practice Steel shall be multiple melted using consumable electrode vacuum practice (VAR) in the remelt cycle. 3.3 Condition The product shall be supplied

17、in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A370: 3.3.1 Bars Bars 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 Parallel Sides Cold finished having ten

18、sile 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 than 229 HBW, or equivalent (see 8.3)

19、. Bars ordered cold finished may have hardness as high as 248 HBW, or equivalent (see 8.3). 3.3.2 Forgings Annealed having hardness not higher than 248 HBW, or equivalent (see 8.3). 3.3.3 Mechanical Tubing Cold finished, unless otherwise ordered, having hardness not higher than 25 HRC, or equivalent

20、 (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. 3.4 Properties The product shall conform to the following requirements; hardness testing shall be performed in accorda

21、nce with ASTM A370: 3.4.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets, tube rounds (solid, not hollow), and forging stock, etched in hot hydrochloric acid in accordance with ASTM A604, shall show no pipe or cracks. Porosity, segregation, inclusions, and oth

22、er imperfections shall be no worse than the macrographs 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 AMS6305G Page 4 of 8 3.4.1.1 Macrostructure examination is not requir

23、ed for hollow tubes that are produced directly from ingots or blooms unless specified by purchaser, in which case the purchaser shall specify standards to be used. 3.4.2 Average Grain Size of Bars, Forgings and Tubing Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112. 3.4.3 Decar

24、burization 3.4.3.1 Bars and tubing ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. Decarburization on tubing ID shall not exceed the maximum total depth specified in Table 4. 3.4.3.2 Allowable decarburization of bars, billets, and t

25、ube rounds ordered for redrawing or forging or to specified microstructural requirements shall be as agreed upon by purchaser and producer. 3.4.3.3 Decarburization of bars, for which 3.3.3.1 or 3.3.3.2 are not applicable, shall not exceed the values shown in Table 3. Table 3A - Maximum total depth o

26、f decarburization, inch/pound units Nominal Diameter or Distance Between Parallel Sides Inches Total Depth of Decarburization Inch Up to 0.375, incl 0.015 Over 0.375 to 0.500, incl 0.017 Over 0.500 to 0.625, incl 0.019 Over 0.625 to 1.000, incl 0.022 Over 1.000 to 1.500, incl 0.025 Over 1.500 to 2.0

27、00, incl 0.030 Over 2.000 to 2.500, incl 0.035 Over 2.500 to 3.000, incl 0.040 Over 3.000 to 4.000, incl 0.045 Table 3B - 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 0.38

28、Over 9.52 to 12.70, incl 0.43 Over 12.70 to 15.88, incl 0.48 Over 15.88 to 25.40, incl 0.56 Over 25.40 to 38.10, incl 0.64 Over 38.10 to 50.80, incl 0.76 Over 50.80 to 63.50, incl 0.89 Over 63.50 to 76.20, incl 1.02 Over 76.20 to 101.60, incl 1.14 SAE INTERNATIONAL AMS6305G Page 5 of 8 3.4.3.4 Decar

29、burization of tubing, for which 3.3.3.1 or 3.3.3.2 are not applicable, shall not exceed the values shown in Table 4. Table 4A - Maximum total depth of decarburization, inch/pound units Nominal Wall Thickness Inches Total Depth ID Inch Total Depth OD Inch Up to 0.109, incl 0.008 0.020 Over 0.109 to 0

30、.203, incl 0.010 0.025 Over 0.203 to 0.400, incl 0.012 0.030 Over 0.400 to 0.600, incl 0.015 0.035 Over 0.600 to 1.000, incl 0.017 0.040 Over 1.000 0.020 0.045 Table 4B - Maximum total depth of decarburization, SI units Nominal Wall Thickness Millimeters Total Depth ID Millimeter Total Depth OD Mill

31、imeter Up to 2.77, incl 0.20 0.51 Over 2.77 to 5.16, incl 0.25 0.64 Over 5.16 to 10.16, incl 0.30 0.76 Over 10.16 to 15.24, incl 0.38 0.89 Over 15.24 to 25.40, incl 0.43 1.02 Over 25.40 0.51 1.14 3.4.3.5 Decarburization shall be evaluated by one of the two methods of 3.4.3.5.1 or 3.4.5.2. 3.4.3.5.1

32、Metallographic Method A cross section taken perpendicular to the surface shall be prepared, etched, and visually examined metallographically at a magnification not to exceed 100X. Optical indications of decarburiztion shall not show a layer of complete (ferrite) or partial decarburization exceeding

33、the limits of Tables 3 or 4. 3.4.3.5.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microindentation hardness testing in accordance with ASTM E384, at a magnification not exceeding 100X, conducted on a hardened, but untempered specimen, p

34、rotected during heat treatment to 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 not further increase in hardness. Such measurements shall be far enough away from any adjacen

35、t surface to be uninfluenced by any decarburization on the adjacent surface. Acceptance shall be as listed in Tables 3 or 4. 3.4.3.6 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the above limits b

36、y more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.65 mm) or less. 3.4.3.7 In case of dispute, the total depth of decarburization determined using the microindentation hardness traverse method shall govern. SAE INTERNATIONAL AMS6305G Page 6 of 8 3.5 QUALITY The product, as received by p

37、urchaser, 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, tears, and cra

38、cks 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 Bars In accorda

39、nce with AMS2251. 3.6.2 Mechanical Tubing In accordance with AMS2253. 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 performance of all required tests. Purchaser reserves the

40、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), average grain size (3.4.2), decarburization (3.4.3),

41、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 (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

42、 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. SAE INTERNATIONAL AMS6305G Page 7 of 8 4.4 Reports 4.4.1 The producer of the bars, forgings and tubing shall furnish wi

43、th 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 and macrostructure of each heat and for condition and average grain size of each lot, and sta

44、ting that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6305G, 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 t

45、he 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 identity, country where the metal w

46、as melted (e.g., final melt in the case of metal processed by multiple melting operations), the results of tests for composition, and macrostructure 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,

47、AMS6305G, 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. 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight bars a

48、nd 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 Forgings In accordance with AMS2808. 5.2.3

49、 Forging Stock As agreed upon by purchaser and producer. 5.3 Protective Treatment Bars and tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment. SAE INTERNATIONAL AMS6305G Page 8 of 8 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 t