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 2015 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/AMS6300G AEROSPACE MATERIAL SPECIFICATION AMS6300 REV. G Issued 1943-04 Revised 2
5、015-12 Superseding AMS6300F Steel Bars and Forgings 0.25Mo (0.35 - 0.40C) (SAE 4037) (Composition similar to UNS G40370) RATIONALE AMS6300G results from a Five Year Review and update of this specification that revises macrostructure, grain size, decarburization testing methods and reporting requirem
6、ents. 1. SCOPE 1.1 Form This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock. 1.2 Application These products have been used typically for parts, 0.375 inch (9.52 mm) and under in nominal section thickness at time of heat treatment, requiring
7、 a through hardening steel capable of developing hardness up to 40 HRC when properly hardened and tempered, and also parts of greater thickness but requiring proportionately lower hardness, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the following documents in
8、 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 has bee
9、n specified, the last 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 B
10、ars AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2301 Steel Cleanliness, Aircraft Quality Magnetic Particle Inspection Procedure AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock SAE INTERNATIONAL AMS6300G
11、Page 2 of 8 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 AMS-H-6875 Heat Treatment of
12、 Steel Raw Materials 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: 610-832-9585, www.astm.org
13、. ASTM A255 Determining Hardenability of Steel ASTM A370 Mechanical Testing of Steel Products ASTM E112 Determining Average Grain Size ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E381 Macroetch Testing, Inspection, and Rat
14、ing Steel Products Comprising Bars, Billets, Blooms, and Forgings ASTM E384 Knoop and Vickers 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 spectrochemic
15、al methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element min max Carbon 0.35 0.40 Manganese 0.70 0.90 Silicon 0.15 0.35 Phosphorus - 0.040 Sulfur - 0.040 Molybdenum 0.20 0.30 Chromium - 0.20 Nickel - 0.25 Copper - 0.35 3.1.1 Aluminum, vanadium and columbium a
16、re optional grain refining elements and need not be determined or reported unless used to satisfy the average grain size requirements of 3.3.2.2. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. SAE INTERNATIONAL AMS6300G Page 3 of 8 3.2 Condition The pr
17、oduct shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A370: 3.2.1 Bars Bar shall not be cut from plate. 3.2.1.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides Cold finished havi
18、ng tensile strength not higher than 130.0 ksi (896 MPa), or equivalent hardness (see 8.2). 3.2.1.2 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 HB, or equivalent (
19、see 8.3). Bars ordered cold finished may have hardness as high as 241 HB, or equivalent (see 8.3). 3.2.2 Forgings Normalized and tempered in accordance with AMS-H-6875. 3.2.3 Forging Stock As ordered by the forging manufacturer. 3.3 Properties The product shall conform to the following requirements;
20、 hardness testing shall be performed in accordance with ASTM A370: 3.3.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets, and forging stock, etched in accordance with ASTM E381, shall not show pipe or cracks. Porosity, segregation, inclusions, and other imperfe
21、ctions shall not be worse than the macrographs of ASTM E381 shown in Table 2. Table 2 - Macrostructure limits Section Size Square Inches Section Size Square Centimeters Macrographs Up to 36, incl Up to 232, incl S2 - R1 - C2 Over 36 to 133, incl Over 133 Over 232 to 858, incl Over 858 S2 - R2 - C3 N
22、ote 1 Note 1: Limits for larger sizes shall be agreed upon by purchaser and producer. The purchaser shall have written approval of the agreement from the cognizant engineering organization. 3.3.2 Average Grain Size of Bars and Forgings Average grain size shall be determined by either 3.3.2.1 or 3.3.
23、2.2. 3.3.2.1 Shall be ASTM 5 or finer, determined in accordance with ASTM E112. 3.3.2.2 The product of a heat shall be considered to have an ASTM No. 5 or finer austenitic grain size if one or more of the following are determined by heat analysis (see 8.6): 3.3.2.2.1 A total aluminum content of 0.02
24、0 to 0.050%. 3.3.2.2.2 An acid soluble aluminum content of 0.015 to 0.050%. SAE INTERNATIONAL AMS6300G Page 4 of 8 3.3.2.2.3 A vanadium content of 0.02 to 0.08%. 3.3.2.2.4 A columbium content of 0.02 to 0.05%. 3.3.3 Hardenability of Each Heat Shall be J1/16 inch (1.5 mm) = 52 HRC min and J5/16 inch
25、(7.5 mm) = 30 HRC min, 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 at 1550 F 10 F (843 C 6 C). 3.3.4 Decarburization 3.3.4.1 Bars ordered ground, turned, or p
26、olished shall be free from decarburization on the ground, turned, or polished surfaces. 3.3.4.2 Allowable decarburization of bars and billets ordered for redrawing or forging or to specified microstructural requirements shall be as agreed upon by purchaser and producer. 3.3.4.3 Decarburization of ba
27、rs that 3.3.4.1 or 3.3.4.2 is not applicable shall be not greater than shown in Table 3. Table 3A Total depth of decarburization, inch/pound units Nominal Diameter or Distance Between Parallel Sides Inches Total Depth of Decarburization Inch Up to 0.375, incl 0.010 Over 0.375 to 0.500, incl 0.012 Ov
28、er 0.500 to 0.625, incl 0.014 Over 0.625 to 1.000, incl 0.017 Over 1.000 to 1.500, incl 0.020 Over 1.500 to 2.000, incl 0.025 Over 2.000 to 2.500, incl 0.030 Over 2.500 to 3.000, incl 0.035 Over 3.000 to 4.000, incl 0.045 Table 3B Total depth of decarburization, SI units Nominal Diameter or Distance
29、 Between Parallel Sides Millimeters Total Depth of Decarburization Millimeters Up to 9.52, incl 0.25 Over 9.52 to 12.70, incl 0.30 Over 12.70 to 15.88, incl 0.36 Over 15.88 to 25.40, incl 0.43 Over 25.40 to 38.10, incl 0.51 Over 38.10 to 50.80, incl 0.64 Over 50.80 to 63.50, incl 0.76 Over 63.50 to
30、76.20, incl 0.89 Over 76.20 to 101.60, incl 1.14 3.3.4.4 Decarburization shall be evaluated by one of the two methods of 3.3.4.4.1 or 3.3.4.4.2. 3.3.4.4.1 Metallographic Method A cross section taken perpendicular to the surface shall be prepared, etched, and visually examined metallographically at a
31、 magnification not to exceed 100X. The product shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Table 3. SAE INTERNATIONAL AMS6300G Page 5 of 8 3.3.4.4.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse metho
32、d using micro hardness testing in accordance with ASTM E384, at a magnification not exceeding 100X, conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Tempering is generally not recommended, but if tempered, the tempering tem
33、perature shall be not higher than 300 F (149 C). 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 adjacent surface to be uninfluenced
34、 by any decarburization on the adjacent surface. Acceptance shall be as listed in Table 3. 3.3.4.4.3 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 by more than 0.005 inch (0.13 mm)
35、 and the width is 0.065 inch (1.65 mm) or less. 3.3.4.4.4 In case of dispute, the total depth of decarburization determined using the micro hardness traverse method shall govern. 3.4 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreig
36、n materials and from imperfections detrimental to usage of the product. 3.4.1 Steel shall be aircraft-quality conforming to AMS2301. 3.4.2 Bars ordered hot rolled or cold drawn, or ground, turned, or polished, shall be free from seams, laps, tears, and cracks open to the machined, ground, turned, or
37、 polished surface after removal of the standard stock removal allowance in accordance with AS1182. 3.4.2.1 Forgings shall have substantially uniform macrostructure. Standards for acceptance shall be as agreed upon by purchaser and producer. 3.4.2.2 Grain flow of die forgings, except in areas that co
38、ntain flash-line end grain, shall follow the general contour of the forgings, and show no evidence of reentrant grain flow. 3.5 Tolerances Bars shall conform to all applicable requirements of AMS2251. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall
39、 supply all samples for producers 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 ensure that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Ac
40、ceptance Tests Composition (3.1), condition (3.2), macrostructure (3.3.1), average grain size (3.3.2), hardenability (3.3.3), decarburization (3.3.4), frequency-severity cleanliness rating (3.4.1) and tolerances (3.5) are acceptance tests and shall be performed on each heat or lot as applicable. If
41、grain refining elements (3.3.2.2) are not present, the ASTM E112 grain size test (3.3.2.1) shall be conducted on each lot. SAE INTERNATIONAL AMS6300G Page 6 of 8 4.2.2 Periodic Tests If grain refining elements (3.3.2.2) are present, the ASTM E112 grain size test (3.3.2.1) shall be conducted on a per
42、iodic basis and shall be performed at a frequency selected by the producer (not to exceed one year) unless frequency of testing is specified by purchaser. Uniform macrostructure of forgings (3.4.2.1) and grain flow of die forgings (3.4.2.2) are periodic tests and shall be performed at a frequency se
43、lected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing 4.3.1 Bars and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In accordance with AMS2372. 4.4 Reports 4.4.1 The producer of bar and forgings shall furnish with each shipment a report show
44、ing producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, macrostructure, hardenability and frequency-severity cleanliness rating of each heat and for the tensile strength or ha
45、rdness as applicable and the condition and, if measured, 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, AMS6300G, product form and size (and/or part number, if appli
46、cable), and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included. If the grain size requirement of 3.3.3.2 is met by the aluminum, vanadium and/or columbium content, the aluminum, vanadium and/or columbium content shall be reported an
47、d a statement that the chemistry satisfies the grain size requirement shall be included. 4.4.2 Report the nominal metallurgically worked cross sectional size and the cut size, if different (see 3.2.1). 4.4.3 The producer of forging stock shall furnish with each shipment a report showing producer ide
48、ntity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, macrostructure, hardenability and frequency-severity rating of each heat and the results of any additional property requirements impose
49、d by the purchase order (see 8.7). This report shall include the purchase order number, heat number, AMS6300G, size and quantity. 4.5 Resampling and Retesting 4.5.1 Bars 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 will be acceptable in m
