SAE AMS 6317K-2017 Steel Bars and Forgings 1 8Ni - 0 25Mo (0 38 - 0 43C) (4640) Heat Treated 125 ksi (862 MPa) Tensile Strength (UNS K22440).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 ther

2、efrom, 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 2017 SAE International All rights reserved. No part of this

3、publication 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: +1 724-776-49

4、70 (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/AMS6317K AEROSPACE MATERIAL SPECIFICATION AMS6317 REV. K Issued 1939-12 Revised 2017-08 Supers

5、eding AMS6317J Steel Bars and Forgings 1.8Ni - 0.25Mo (0.38 - 0.43C) (4640) Heat Treated, 125 ksi (862 MPa) Tensile Strength (Composition similar to UNS K22440) RATIONALE AMS6317K results from a Five-Year Review and update of this specification that allows the use of grain refiners (3.1.1), adds hea

6、t teating reqirements (3.3), revises decarburizaion testing (3.4.3.3), adds tensile testing strain rate (3.4.4.2), revises surface quality (3.5.2), reporting (4.4) and identification (5.2). 1. SCOPE 1.1 Form This specification covers an aircraft-quality, low-alloy steel in the form of heat treated b

7、ars and forgings. 1.2 Application These products have been used typically for parts with sections 1.0 inch (25 mm) and under in nominal thickness requiring a minimum tensile strength of 125 ksi (862 MPa), but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the followi

8、ng 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 no superseding d

9、ocument 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. AMS2251 Tolerances, Lo

10、w-Alloy Steel Bars 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 INTERN

11、ATIONAL AMS6317K 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 AMS2750 Pyrometry AMS2808 Identification

12、, Forgings AMS6312 Steel Bars, Forgings, and Tubing 1.8Ni - 0.25Mo (0.38 - 0.43C) (4640) 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 Publication

13、s Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A370 Mechanical Testing of Steel Products ASTM E112 Determining Average Grain Size ASTM E140 Hardness Conversion Tables for Metals Relationship Among Bri

14、nell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E381 Macroetch Testing, Steel Bars, Billets, Blo

15、oms, and Forgings 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 methods, or by other analytical methods accept

16、able to purchaser. Table 1 - Composition Element Min Max Carbon 0.38 0.43 Manganese 0.60 0.80 Silicon 0.15 0.35 Phosphorus - 0.025 Sulfur - 0.025 Nickel 1.65 2.00 Molybdenum 0.20 0.30 Chromium - 0.20 Copper - 0.35 3.1.1 Optional grain refining elements aluminum, vanadium and columbium may be added t

17、o ensure the average grain size requirement. The ranges of the grain refiners are as follows: 3.1.1.1 A total aluminum content of 0.020 to 0.050%. 3.1.1.2 An acid soluble aluminum content of 0.015 to 0.050%. SAE INTERNATIONAL AMS6317K Page 3 of 8 3.1.1.3 A vanadium content of 0.02 to 0.08%. 3.1.1.4

18、A columbium content of 0.02 to 0.05%. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Condition The product shall be supplied in the following condition: 3.2.1 Bars Bars shall not be cut from plate. (Also see 4.4.2). 3.2.1.1 Bars 0.500 Inch (12.70 m

19、m) and Under in Nominal Diameter or Least Distance Between Parallel Sides Cold finished, hardened, and tempered. 3.2.1.2 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel Sides Hot finished, or cold finished when so ordered, hardened, and tempered. 3.2.2 Forgings

20、 Hardened and tempered. 3.2.2.1 Forging stock produced to AMS6312 may be used as starting material for forgings. 3.3 Heat Treatment Bars and forgings shall be hardened by quenching from 1525 F 25 F (843 C 14 C) and tempered as required; Pyrometry shall be in accordance with AMS2750. 3.4 Properties T

21、he product shall conform to the following requirements; hardness and tensile testing shall be performed in accordance with ASTM A370: 3.4.1 Macrostructure Visual examination of transverse full cross sections from bars and billets, etched in hot hydrochloric acid in accordance with ASTM E381, shall s

22、how no pipe 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 limits Cross-Sectional Area Square Inches Cross-Sectional Area Square Centimeters Macrographs Up to 36, incl Up to 232, inc

23、l 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 of the agreement from the cognizant engineering organization. 3.4.2 Average Grain Siz

24、e of Bars and Forgings Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112. SAE INTERNATIONAL AMS6317K Page 4 of 8 3.4.3 Decarburization 3.4.3.1 Bars ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. 3.4.3.2 Decarbur

25、ization of bars that 3.3.3.1 is not applicable shall be not greater than shown in Table 3. Table 3 Table 3A - Maximum depth of decarburization limits, 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

26、 0.500, incl 0.012 Over 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 Table 3B - Maximum depth of decarburization limits, SI units Nominal Diameter or Distance

27、 Between Parallel Sides Millimeters Total Depth of Decarburization Millimeter 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 7

28、6.20, incl 0.89 3.4.3.3 Decarburization shall be evaluated by one of the two methods of 3.4.3.3.1 or 3.4.3.3.2, selected at the discretion of the producer. 3.4.3.3.1 Metallographic Method A cross section taken perpendicular to the surface shall be prepared, etched, and visually examined metallograph

29、ically 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. 3.4.3.3.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microindentation har

30、dness 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. Depth of decarburization is defined as the perpendicular distance from the surface to the d

31、epth 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 by any decarburization on the adjacent surface. Acceptance shall be as listed in Table 3. SAE INTERNATIONAL AMS6317K Page 5 of 8 3.4.3.3.3

32、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) and the width is 0.065 inch (1.65 mm) or less. 3.4.3.3.4 In case of dispute, the total depth of deca

33、rburization determined using the microindentation hardness traverse method shall govern. 3.4.4 Tensile Properties Specimens, cut longitudinally from bars 1.00 inch (25.4 mm) and under in nominal diameter or distance between parallel sides and from forgings 1.00 inch (25.4 mm) and under in nominal cr

34、oss-section with axis of specimen in area of gage length within 15 of parallel to forging flow lines, shall have the properties shown in Table 4. Table 4 - Minimum tensile properties Property Value Tensile Strength 125 ksi (862 MPa) Yield Strength at 0.2% Offset 100 ksi (689 MPa) Elongation in 4D 16

35、% Reduction of Area 50% 3.4.4.1 When specified, transverse tensile properties and longitudinal tensile properties of bars over 1.00 inch (25.4 mm) in nominal diameter or distance between parallel sides and of forgings over 1.00 inch (25.4 mm) in nominal cross-section shall be as agreed upon by purch

36、aser and producer. 3.4.4.2 Unless otherwise specified, the strain rate shall be set at 0.005 inch/inch/minute (0.005 mm/mm/minute) and maintained within a tolerance of 0.002 inch/inch/minute (0.002 mm/mm/minute) through 0.2% offset yield strain. After the yield strain, the speed of the testing machi

37、ne shall be set between 0.05 and 0.5 in/in. (mm/mm) of the length of the reduced section (or distance between the grips for specimens not having a reduced section) per minute. Alternatively, an extensometer and strain rate indicator may be used to set the strain rate between 0.05 and 0.5 in./in./min

38、 (mm/mm/minute). 3.4.5 Hardness Shall be 262 to 311 HB, or equivalent (see 8.2), but the product shall not be rejected on the basis of hardness if the tensile property requirements of 3.3.4 are acceptable, determined on specimens taken from the same sample as that with nonconforming hardness or from

39、 another sample with similar nonconforming hardness. 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 aircraft-quality conforming to AM

40、S2301. 3.5.2 Bars shall, be free from seams, laps, tears, and cracks after removal of the standard stock removal allowance in accordance with AS1182 3.5.3 Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow the general contour of the forgings showing no evide

41、nce of reentrant grain flow. 3.6 Tolerances Bars shall conform to all applicable requirements of AMS2251. SAE INTERNATIONAL AMS6317K Page 6 of 8 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests and shall be res

42、ponsible for the performance of all required tests. Purchaser reserves the 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), macrostructure (3.3

43、.1), average grain size (3.3.2), decarburization (3.3.3), tensile properties (3.3.4), hardness (3.3.5), frequency-severity cleanliness (3.4), and tolerances (3.5) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Grain flow of die forgings (3.4.3) is

44、 a periodic test and shall be performed at a frequency selected by the producer unless a frequency of testing is specified by purchaser. 4.3 Sampling and Testing 4.3.1 Bars In accordance with AMS2370. 4.3.2 Forgings In accordance with AMS2372. 4.4 Reports 4.4.1 The producer of the product shall furn

45、ish with each shipment a report showing producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations), the results of composition, macrostructure, and frequency-severity cleanliness rating for each heat and for average grain si

46、ze and tensile properties 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, AMS6317K, product form, size (and/or part number, if applicable), and quantity. If forgings are supplied, the si

47、ze and melt source of stock used to make the forgings shall also be included. If the aluminum, vanadium and/or columbium content are utilized, the aluminum, vanadium and/or columbium content shall be reported. 4.4.2 If the ship size/shape is cut from a larger cross section, report the nominal metall

48、urgically worked size (see 3.2.1). 4.4.3 When material produced to this specification is beyond the sizes allowed in the scope or tables, or other exceptions are taken to the technical requirements listed in Section 3, (see 5.2) the report shall contain a statement “This material is certified as AMS

49、6317K(EXC) because of the following exceptions:“ and the specific exceptions shall be listed. 4.5 Resampling and Retesting 4.5.1 Bars In accordance with AMS2370. 4.5.2 Forgings In accordance with AMS2372. SAE INTERNATIONAL AMS6317K Page 7 of 8 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight bars will be acceptable in mill lengths of 6 to 20 feet (1.8 t