SAE AMS 6385K-2015 Steel Sheet Strip and Plate Low Alloy Heat-Resistant 0 65Si - 1 25Cr - 0 50Mo - 0 25V (0 27 - 0 33C) (UNS K23015).pdf

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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/AMS6385K AEROSPACE MATERIAL SPECIFICATION AMS6385 REV. K Issued 1959-06 Revised 2

5、015-12 Superseding AMS6385J Steel Sheet, Strip, and Plate, Low Alloy, Heat-Resistant 0.65Si - 1.25Cr - 0.50Mo - 0.25V (0.27 - 0.33C) (Composition similar to UNS K23015) RATIONALE AMS6385K revises condition, macrostructure, grain size requirements, decarburization testing methods and reporting. 1. SC

6、OPE 1.1 Form This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate. 1.2 Application This material has been used typically for parts requiring strength up to 1000 F (538 C), but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issu

7、e 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 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

8、no superseding document has been 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. AMS225

9、2 Tolerances, Low-Alloy Steel Sheet, Strip, and Plate 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 Prod

10、ucts and Forging Stock AMS2807 Identification, Carbon and Low-Alloy Steels, Corrosions and Heat-Resistant Steels and Alloys, Sheet, Strip, Plate, and Aircraft Tubing SAE INTERNATIONAL AMS6385K Page 2 of 7 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700,

11、West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A370 Mechanical Testing of Steel Products ASTM E21 Elevated Temperature Tension Tests of Metallic Materials ASTM E112 Determining Average Grain Size ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrica

12、l Steel, Ingot Iron, and Wrought Iron ASTM E381 Macroetch Testing, Steel, Bars, Billets, Blooms, and Forgings ASTM E384 Knoop and Vickers Hardness of Materials 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the following percentages by weight shown in Table 1, determined by wet chemical

13、methods in accordance with ASTM E350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element min max Carbon 0.27 0.33 Manganese 0.45 0.65 Silicon 0.55 0.75 Phosphorus - 0.025 Sulfur - 0.025 Chromium 1.00 1.50 Molybdenum 0.40 0.60 Vanadium 0.

14、20 0.30 Nickel - 0.25 Copper - 0.35 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Condition The product shall be supplied in the following condition; hardness shall be determined in accordance with ASTM A370: 3.2.1 Sheet and Strip Cold finished, b

15、right or atmosphere annealed, sub-critically annealed or normalized, and descaled if necessary, having hardness not higher than 98 HRB, or equivalent (see 8.2). 3.2.2 Plate Hot rolled, annealed, sub-critically annealed or normalized, if necessary, and descaled, having hardness not higher than 24 HRC

16、, or equivalent (see 8.2). 3.2.2.1 If allowed by the purchaser, cold rolled, annealed, sub-critically annealed or normalized if necessary and descaled as necessary, having hardness not higher than 24 HRC, or equivalent (see 8.2). SAE INTERNATIONAL AMS6385K Page 3 of 7 3.3 Properties The product shal

17、l conform to the following requirements; hardness, tensile, and bend testing shall be performed in accordance with ASTM A370 except as specified in 3.3.5.1.2: 3.3.1 Macrostructure Visual examination of transverse full cross sections from finished slab or billet or suitable rerolled product, etched i

18、n hot hydrochloric acid in accordance with ASTM E381, shall show no pipes or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM E381 shown in Table 2. Table 2 - Macrostructure Section Size Square Inches Section Size Square Centimeters Ma

19、crographs Up to 36, incl Up to 232, incl S2 - R1 - C2 Over 36 to 133, incl Over 232 to 858, incl S2 - R2 - C3 Over 133 Over 858 Note 1 Note 1: Limits for larger sizes shall be agreed upon by purchaser and producer. The purchaser shall have written approval from the cognizant engineering organization

20、. 3.3.2 Average Grain Size Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112 (see 8.5). 3.3.3 Decarburization Decarburization shall be evaluated by one of the methods of 3.3.3.1 or 3.3.3.2. 3.3.3.1 Metallographic Method A cross section taken perpendicular to the surface shall be

21、prepared, etched, and visually examined metallographically at a magnification not to exceed 100X. The product shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Table 3. 3.3.3.2 Hardness Traverse Method The total depth of decarburization shall be determin

22、ed by a traverse method using microhardness 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 temper

23、ed, the tempering temperature 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 surfa

24、ce to be uninfluenced by any decarburization on the adjacent surface. Acceptance shall be as listed in Table 3. Table 3A - Maximum total depth of decarburization, inch/pound units Nominal Wall Thickness Inches Total Depth of Decarburization Inch Up to 0.500, incl 0.015 Over 0.500 to 1.000, incl 0.02

25、5 Over 1.000 0.035 SAE INTERNATIONAL AMS6385K Page 4 of 7 Table 3B - Maximum total depth of decarburization, SI units Nominal Thickness Millimeters Total Depth of Decarburization Millimeter Up to 12.70, incl 0.38 Over 12.70 to 25.40, incl 0.64 Over 25.40 0.89 3.3.3.3 When determining the depth of de

26、carburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the limits of Table 3 by more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.65 mm) or less. 3.3.3.4 In the case of dispute, the total depth of decarburization determined us

27、ing the microhardness traverse method shall govern. 3.3.4 Bending Product 0.749 inch (19.02 mm) and under in nominal thickness shall withstand, without evidence of cracking when examined at 20X magnification, bending at room temperature through the angle shown in Table 4 around a diameter equal to t

28、hree times the nominal thickness of the product, with axis of bend parallel to the direction of rolling. Table 4 - Bend angle Nominal Thickness Inches Nominal Thickness Millimeters Bend Angle Degrees Up to 0.249, incl Up to 6.32, incl 130 Over 0.249 to 0.749, incl Over 6.32 to 19.02, incl 90 3.3.5 A

29、fter Normalizing and Tempering The product shall have the following properties after being normalized by heating to 1750 F 15 F (954 C 8 C), holding at heat for not less than 6 minutes per 0.10 inch (2.5 mm) of nominal thickness, and cooling at a rate equivalent to air cooling, and tempered by heati

30、ng to 1100 F 10 F (593 C 6 C), holding at heat for not less than 6 hours, and cooling in air: 3.3.5.1 Tensile Properties Shall be in accordance with 3.3.5.1.1 and 3.3.5.1.2. 3.3.5.1.1 At Room Temperature Shall be as shown in Table 5. Table 5 - Minimum tensile properties at room temperature Property

31、Value Tensile Strength 135 ksi (931 MPa) Yield Strength at 0.2% Offset 115 ksi (793 MPa) Elongation in 2 inches (50.8 mm) or 4D, Nominal Thickness Inches Nominal Thickness Millimeters Up to 0.050, incl Up to 1.27, incl 8% Over 0.050 to 0.100, incl Over 1.27 to 3.18, incl 10% Over 0.100 Over 3.18 12%

32、 SAE INTERNATIONAL AMS6385K Page 5 of 7 3.3.5.1.2 At 1000 F (538 C) Specimens shall have the properties shown in Table 6 after being heated to 1000 F 10 F (538 C 6 C), held at heat for 20 to 30 minutes before testing, and tested in accordance with ASTM E21 at 1000 F 10 F (538 C 6 C) at a rate of 0.0

33、45 to 0.062 inch per inch per minute (0.045 to 0.062 mm/mm per minute) up to the yield strength and 0.1 to 0.2 inch per inch per minute (0.1 to 0.2 mm/mm per minute) thereafter. Table 6 - Minimum 1000 F (538 C) tensile properties Property Value Tensile Strength 85 ksi (586 MPa) Yield Strength at 0.2

34、% Offset 70 ksi (483 MPa) Elongation in 2 inches (50.8 mm) or 4D, Nominal Thickness Inches Nominal Thickness Millimeters Up to 0.075, incl Up to 1.90, incl 8% Over 0.075 to 0.125, incl Over 1.90 to 3.18, incl 10% Over 0.125 Over 3.18 12% 3.3.5.2 Hardness Shall be not lower than 27 HRC, or equivalent

35、 (see 8.2), but the product shall not be rejected on the basis of hardness if the tensile property requirements of 3.3.5.1.1 are acceptable, determined on specimens taken from the same sample as that with nonconforming hardness or from another sample with similar nonconforming hardness. 3.4 Quality

36、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. 3.4.1 Steel shall be aircraft quality conforming to AMS2301. 3.5 Tolerances Shall conform to all applicable requirement

37、s of AMS2252. 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 right to sample and to perform any confirmatory testing

38、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 (3.2), decarburization (3.3.3), bending (3.3.4), tensile properties and hardness at room temperature after heat treatment (3.3.5.1.1 and 3.3

39、.5.2), 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. 4.2.2 Periodic Tests Macrostructure (3.3.1) average grain size (3.3.2), and tensile properties at 1000 F (538 C) after heat treatment (3.3.5.1.2)

40、are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. The frequency of testing for average grain size shall not exceed one year. SAE INTERNATIONAL AMS6385K Page 6 of 7 4.3 Sampling and Testing Shall be in accordance w

41、ith AMS2370 and the following: 4.3.1 Samples for macrostructure rating (3.3.1) shall be full cross-sectional specimens obtained from the finished slab or billet or suitable rerolled product representing the top and bottom of at least the first, middle, and last usable ingot of each heat. 4.4 Reports

42、 The producer of the product shall furnish with each shipment a report showing the producer identity, country where the steel was melted (e.g., final melt in the case of steel processed by multiple melting operations), results of tests for composition, macrostructure, frequency-severity cleanliness

43、rating of each heat and for condition and bending of each lot, and for room temperature tensile properties of each lot after heat treatment and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6385K,

44、product form, size, and quantity. 4.5 Resampling and Retesting Shall be in accordance with AMS2370. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS2807. 5.2 Protective Treatment The product shall be protected from corrosion prior to shipment. 5.3 Packaging The product

45、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 producer shall include this speci

46、fication 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 bar (l) located in the lef

47、t 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 technical revisions. Change

48、bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Hardness conversion tables for metals are presented in ASTM E140. 8.3 Terms used in AMS are clarified in ARP1917. SAE INTERNATIONAL AMS6385K Page 7 of 7 8.4 Dimensions and properties in inch

49、/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. 8.5 When vanadium, a grain refiner, is present above 0.02% the grain size resulting from using the appropriate test procedures per ASTM E112 will always satisfy an AST