1、AEROSPACE MATERIAL SPECIFICATIONAMS6519 REV. DIssued 1986-01Reaffirmed 2006-02Revised 2014-07Superseding AMS6519CSteel, Maraging, Bars, Forgings, Tubing, and Rings19Ni -3.0Mo -1.4Ti -0.10AlPremium Aircraft QualityDouble Vacuum Melted, Annealed(Composition similar to UNS K92150)RATIONALEAMS6519D resu
2、lts from a Five Year Review and update of this specification that revises cutting restrictions, corrects SI converted dimensions and revises reporting requirements.1. SCOPE1.1 FormThis specification covers a premium aircraft-quality, maraging steel in the form of bars, forgings, mechanical tubing, f
3、lash welded rings, and stock for forging or flash welded rings.1.2 ApplicationThese products have been used typically for parts, such as pressure vessels, requiring through hardening, without quenching, to a minimum yield strength of 240 ksi (1655 MPa) and where such parts may require welding during
4、 fabrication, but usage is not limited to such applications.2. APPLICABLE DOCUMENTSThe issue 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
5、 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 document shall apply.2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 8
6、77-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2248 Chemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron AlloysAMS2251 Tolerances, Low-Alloy Steel Bars_SAE Technical Standards Board Rules
7、 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 therefrom, is the sole responsibility of t
8、he 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 2014 SAE InternationalAll rights reserved. No part of this publication may be reproduced, stored in
9、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: 724-776-0790Email: Cus
10、tomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS6519DSAE INTERNATIONAL AMS6519D Page 2 of 8AMS2253 Tolerances, Carbon and Alloy Steel TubingAMS2300 Steel Cleanliness, Premium
11、 Aircraft-Quality, Magnetic Particle Inspection ProcedureAMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging StockAMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel ForgingsAMS2750 PyrometryAMS2806 Identification, Bars, Wire
12、, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and AlloysAMS2808 Identification, ForgingsAMS7496 Rings, Flash Welded, Carbon and Low-Alloy SteelsAS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and
13、 Mechanical Tubing2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,Tel: 610-832-9585, www.astm.org.ASTM A 370 Mechanical Testing of Steel ProductsASTM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and
14、 BilletsASTM E 45 Determining the Inclusion Content of SteelASTM E 112 Determining Average Grain SizeASTM E 353 Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron AlloysASTM E 399 Linear-Elastic Plane-Strain Fracture Toughness KIC of Metallic Materials3.
15、 TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 353, by spectrochemical methods, or by other analytical methods acceptable to purchaser.SAE INTERNATIONAL AMS6519D Page 3 of 8TABLE 1 - COMP
16、OSITIONElement min maxCarbon - 0.03Manganese - 0.10Silicon - 0.10Phosphorus - 0.010Sulfur - 0.010Nickel 18.00 20.00Molybdenum 2.75 3.25Titanium 1.30 1.45Aluminum 0.05 0.15Chromium - 0.50Cobalt - 0.50Copper - 0.503.1.1 Prior to pouring, up to 0.05% calcium shall be added to the melt but analysis for
17、this element need not be performed.3.1.2 Check AnalysisComposition variations shall meet the applicable requirements of AMS2248.3.2 Melting PracticeSteel shall be produced by multiple melting using vacuum induction process (VIM) in the initial melt and vacuum consumable electrode remelt practice (VA
18、R) in the final melt.3.3 Condition3.3.1 BarsAnnealed and descaled. Bar shall not be cut from plate (Also see 4.4.2).3.3.2 Forgings, Mechanical Tubing, and Flash Welded RingsAnnealed and descaled.3.3.2.1 Flash welded rings shall not be supplied unless specified or permitted on purchasers part drawing
19、. When supplied, rings shall be manufactured in accordance with AMS7496.3.3.3 Stock for Forgings or Flash Welded RingsAs ordered by the forging or flash welded ring manufacturer.3.4 Heat TreatmentBars, forgings, mechanical tubing, and flash-welded rings shall be annealed by heating to a temperature
20、within the range 1500 to 1700 F (816 to 927 C), holding at the selected temperature within 25 F (14 C) for 1 to 2 hours, and cooling to room temperature in air or other atmosphere at a rate equivalent to an air cool. Pyrometry shall be in accordance with AMS2750.3.5 PropertiesThe product shall confo
21、rm to the following requirements; hardness and tensile testing shall be performed in accordance with ASTM A 370:3.5.1SAE INTERNATIONAL AMS6519D Page 4 of 83.5.2 MacrostructureVisual examination of transverse full cross-sections from bars, billets, tube rounds, and stock for forging or flash welded r
22、ings, etched in hot hydrochloric acid in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM A 604 shown in Table 2. TABLE 2 - MACROSTRUCTURE LIMITSClass Condition Severity1Freckles A2Whit
23、e Spots A3 Radial Segregation B4 Ring Pattern B3.5.3 Micro-Inclusion Rating of each heatNo specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E 45, Method D.TABLE 3 - MICRO-INCLUSION RATINGType A B C D EThin 1.51.51.52.03.0Heavy 1.0 1.0 1.0 1.5 1.53.5.3.1 Type E is
24、 titanium nitrides and shall be rated in the same manner as Type B.3.5.4 Bars, Wire, Forgings, Tubing, and Flash Welded Rings3.5.4.1 Annealed Condition3.5.4.1.1 HardnessBars over 0.500 inch (12.70 mm) in nominal diameter or least distance between parallel sides, forgings, tubing, and flash welded ri
25、ngs shall have hardness not higher than 321 HB, or equivalent (See 8.2).3.5.4.1.2 Tensile StrengthBars 0.500 inch (12.70 mm) and under in nominal diameter or least distance between parallel sides shall have tensile strength not higher than 160 ksi (1105 MPa) or equivalent hardness (See 8.3).3.5.4.1.
26、3 Average Grain SizeShall be as follows, determined in accordance with ASTM E 112.3.5.4.1.3.1 Product Under 2.50 Inches (62.5 mm) in Nominal Section ThicknessASTM No. 6 or finer.3.5.4.1.3.2 Product 2.50 to 10.00 Inches (62.5 to 250.0 mm), Inclusive, in Nominal Section ThicknessASTM No. 4 or finer.3.
27、5.4.2 After Maraging Heat TreatmentThe product shall have the properties shown in Table 4 after being maraged by heating to 900 F 10 (482 C 6), holding at heat for 4 to 6 hours, and cooling to room temperature:SAE INTERNATIONAL AMS6519D Page 5 of 83.5.4.2.1 Tensile PropertiesShall be as shown in Tab
28、le 4 and 3.5.3.2.1.1.3.5.4.2.1.1 Longitudinal requirements apply to specimens taken with the axis of specimens approximately parallel to the grain flow and to specimens taken in the radial direction and in the tangential direction at the rim of disc forgings. All other specimens shall be considered
29、to be in the transverse direction.3.5.4.2.1.2 Transverse requirements apply only to product from which tensile specimens not less than 2.50 inches (62.5 mm) in length can be taken.3.5.4.2.1.3 Tensile properties in the longitudinal direction need not be determined on product tested in the transverse
30、direction.TABLE 4A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITSNominalSection ThicknessInchesSpecimenOrientationTensileStrengthksiYield Strengthat 0.2% OffsetksiElongationin 4D%Reductionof Area%Up to 4.000, excl Longitudinal 255 250 6 45Transverse 255 250 4 354.000 to 10.000, incl Longitudinal 245
31、 240 5 30Transverse 245 240 3 20TABLE 4B - MINIMUM TENSILE PROPERTIES, SI UNITSNominalSection ThicknessMillimetersSpecimenOrientationTensileStrengthMPaYield Strengthat 0.2% OffsetMPaElongationin 4D%Reductionof Area%Up to 101.60, excl Longitudinal 1760 1725 6 45Transverse 1760 1725 4 35101.60 to 254.
32、00, incl Longitudinal 1690 1655 5 30Transverse 1690 1655 3 203.5.4.2.2 HardnessShall be not lower than 48 HRC, or equivalent (See 8.2), but the product shall not be rejected on the basis of hardness if the tensile property requirements are acceptable, determined on specimens taken from the same samp
33、le as that with nonconforming hardness or from another sample with similar nonconforming hardness.3.5.4.2.3 Fracture ToughnessWhen specified, the product shall be subjected to fracture toughness testing. Method of test and standards for acceptance shall be as agreed upon by purchaser and vendor. AST
34、M E 399 is a suggested method of test.3.5.5 Forging StockWhen a sample of stock is forged to a test coupon and heat treated as in 3.4 and 3.5.3.2, specimens taken from the heat treated coupon shall conform to the requirements of 3.5.3.2.1 and 3.5.3.2.2 and, when specified, 3.5.3.2.3. If specimens ta
35、ken from the stock after heat treatment as in 3.4 and 3.5.3.2 conform to the requirements of 3.5.3.2.1 and 3.5.3.2.2, and, when specified, 3.5.3.2.3, the tests shall be accepted as equivalent to tests of a forged coupon.3.5.6 Stock for Flash Welded RingsA sample of stock heat treated as in 3.4 and 3
36、.5.3.2 shall conform to the requirements of 3.5.3.2.1, 3.5.3.2.2, and, when specified, 3.5.3.2.3.SAE INTERNATIONAL AMS6519D Page 6 of 83.6 QualityThe product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimenta
37、l to usage of the product.3.6.1 Steel shall be premium aircraft-quality conforming to AMS2300.3.6.2 Bars and tubing ordered hot rolled or cold drawn, or ground, turned, or polished, shall, after removal of the standard stock removal allowance in accordance with AS1182, be free from seams, laps, tear
38、s, and cracks open to the ground, turned, or polished surface.3.6.3 Grain flow of die forgings, except in areas that contain flash-line end grain, shall follow the general contour of the forging, showing no evidence of reentrant flow.3.7 Tolerances3.7.1 BarsIn accordance with AMS2251.3.7.2 Mechanica
39、l TubingIn accordance with AMS2253.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confir
40、matory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests4.2.1 Acceptance TestsTests for the following requirements are acceptance tests and shall be performed on each heat or lot as applicable:4.2.1.1 Composition (3.1), macrostructure
41、 (3.5.1), micro-inclusion rating (3.5.2), and frequency-severity cleanliness rating (3.6.1) of each heat.4.2.1.2 Hardness (3.5.3.1.1) or tensile properties (3.5.3.1.2), as applicable, of each lot of bars, forgings, tubing, and flash welded rings as annealed.4.2.1.3 Average grain size (3.5.3.1.3) of
42、each lot of bars, forgings, tubing, and flash welded rings as annealed.4.2.1.4 Tensile properties (3.5.3.2.1) and hardness (3.5.3.2.2) of each lot of bars, forgings, tubing, and flash welded rings after maraging heat treatment.4.2.1.5 Tolerances of bars (3.7.1) and mechanical tubing (3.7.2).4.2.1.6
43、When specified, fracture toughness (3.5.3.2.3) of the product.4.2.2 Periodic TestsTests for grain flow of die forgings (3.6.3) and ability of forging stock (3.5.4) and of stock for flash welded rings (3.5.5) to develop required properties are periodic tests and shall be performed at a frequency sele
44、cted by the vendor unless frequency of testing is specified by purchaser. SAE INTERNATIONAL AMS6519D Page 7 of 84.3 Sampling and Testing4.3.1 Bars, Mechanical Tubing, Flash Welded Rings, and Stock for Forging or Flash Welded RingsIn accordance with AMS2370.4.3.2 ForgingsIn accordance with AMS2372.4.
45、4 Reports4.4.1 The producer of forgings, tubing and flash welded rings shall furnish with 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), the results of tests for composition,
46、macrostructure, micro-inclusion rating, and frequency-severity rating of each heat, and for annealed hardness and average grain size, and for tensile properties, hardness, and, when specified, fracture toughness after maraging of each lot, and stating that the product conforms to the other technical
47、 requirements. This report shall include the purchase order number, heat and lot numbers, AMS6519D, 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 be included.4.4.2 Report the nomina
48、l metallurgically worked cross sectional size and the cut size, if different (Also see 3.3.1).4.4.3 The producer of stock for forging or flash welded rings shall furnish with each shipment a report showing the producer identity, country where the metal was melted (e. g., final melt in the case of me
49、tal processed by multiple melting operations) and the results of tests for composition, macrostructure, micro-inclusion rating, and frequency-severity rating of each heat. This report shall include the purchase order number, heat number, AMS6519D, size and quantity.4.5 Resampling and Retesting4.5.1 Bars, Mechanical Tubing, Flash Welded Rings, and Stock for Flash Welded RingsIn accordance with AMS2370.4.5.2 ForgingsIn accor
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