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 theref
2、rom, 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 2013 SAE InternationalAll rights reserved. No part of this publi
3、cation 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: +1 724-776-4970 (outs
4、ide USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS6556AEROSPACE MATERIAL SPECIFICATIONAMS6556Issued 2013-08Steel, Bars, Wire, and Forgings8V
5、- 4Cr - 4W - 3Mo (2.45 - 2.55C)Powder Metallurgy ProductHot Isostatically Pressed(Composition similar to UNS T11453)RATIONALEAMS6556 is a new specification to cover UNS T11453, a high speed steel, in the form of gas-atomized and HIP-consolidated solid bar products, forgings and forging stock.1. SCOP
6、E1.1 FormThis specification covers a premium aircraft-quality, high-alloy steel in the form of bars, wire, forgings, and forging stock.1.2 ApplicationThese products have been used typically for critical parts, such as bearings operating under heavy loads and high speeds at moderate temperatures and
7、subject to very rigid inspection standards, 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 r
8、evision 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 document shall apply.2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, War
9、rendale, PA15096-0001, Tel: 877-606-7323 (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 AlloysAMS2370 Quality Assurance Sampling and Testing,
10、Carbon and Low-Alloy Steel Wrought Products and Forging StockAMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel ForgingsSAE INTERNATIONAL AMS6556 Page 2 of 7AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-R
11、esistant Steels and AlloysAMS2808 Identification, ForgingsAS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA19428-29
12、59, Tel: 610-832-9585, www.astm.org.ASTM E 45 Determining the Inclusion Content of Steel ASTM A 370 Mechanical Testing of Steel ProductsASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought IronASTM E 384 Knoop and Vickers Hardness of Materi
13、als2.3 European Committee for StandardizationAvailable from British Standards Institution Group, 389 Chiswick High Road, London, W4 4AL, United Kingdom,Tel: +44 (0)20 8996 9001, Or: Nationial Standards Authority of Ireland, 1 Swift Square, Northwood, Santry, Dublin 9, Ireland, Tel: +353 1 807 3800,
14、www.nsai.ieEN 10228 Steel Cleanliness Non-destructive Testing of Steel Forgings Part 3: Ultrasonic Testing of Ferritic or Martensitic Steel3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E
15、 350, by spectrochemical methods, or by other analytical methods acceptable to purchaser.TABLE 1 - COMPOSITIONElement min maxCarbon 2.45 2.55Manganese 0.20 0.60Silicon 0.40 0.60Phosphorus 0.030Sulfur 0.020Chromium 3.75 4.50Nickel 0.50Cobalt 1.00Molybdenum 2.80 3.40Tungsten 3.80 4.40Vanadium 7.60 8.2
16、0SAE INTERNATIONAL AMS6556 Page 3 of 73.1.1 Check AnalysisComposition variations shall meet the requirements of AMS2248, except that carbon shall be plus or minus 0.04% and vanadium plus or minus 0.10%.3.2 Melting PracticeSteel shall be produced by inert gas atomization of pre-alloyed melts, with re
17、sulting powder consolidated via hot isostatic pressing (HIP). Sintering or the use of binders or fillers to consolidate powder is not permitted. Blending of elemental powders to achieve the required chemical composition is not permitted.3.3 ConditionThe product shall be supplied in the following con
18、dition; hardness shall be determined in accordance with ASTM A 370.3.3.1 Bars3.3.1.1 Annealed material shall have hardness not higher than 310 BHN, or equivalent hardness (See 8.2).3.3.1.2 Hot-drawn material shall have hardness not higher than 340 BHN or equivalent hardness (See 8.2).3.3.2 Wire Hot
19、finished having tensile strength not higher than 177 ksi (1220 MPa) or equivalent hardness (See 8.3).3.3.3 ForgingsAs ordered.3.3.4 Forging StockAs ordered by the forging manufacturer.3.4 Properties3.4.1 Response to Heat Treatment of Each Lot of Bars, Forgings, Wire and Forging StockSpecimen or samp
20、les cut from larger products with section thickness not exceeding 0.375 inch (9.52 mm) shall have hardness not lower than 64 HRC, or equivalent (See 8.2), after being heat treated in accordance with the following heat treatment: Preheat in two steps at 842 to 932 F (450 to 500 C) and at 1562 to 1652
21、 F (850 to 900 C), hold for one minute at each temperature, austenitize at 2155 F (1179 C), quench down to 100 to 120 F (38 to 49 C) or lower in air, temper three times at 1040 F (560 C) at least 1 hour at temperature each time, air cool to room temperature 77 F (25 C) between tempers. 3.4.2 Micro-I
22、nclusion Rating of Each HeatNo specimen shall exceed the limits of Table 2, determined in accordance with ASTM E 45, Method A.TABLE 2 - MICRO-INCLUSION RATINGType A B C DThin 1.5 1.5 1.5 1.5Heavy 1.0 1.0 1.0 1.03.4.3 Decarburization3.4.3.1 Bars and wire ordered ground, turned, or polished shall be f
23、ree from decarburization on the ground, turned, or polished surfaces.SAE INTERNATIONAL AMS6556 Page 4 of 73.4.3.2 Allowable decarburization of bars, wire, and billets ordered for forging or to specified microstructural requirements shall be as agreed upon by purchaser and vendor.3.4.3.3 Decarburizat
24、ion of bars and wire to which 3.4.3.1 or 3.4.3.2 is not applicable shall be not greater than shown in Table 3.TABLE 3A MAXIMUM DEPTH OF DECARBURIZATION, INCH/POUND UNITSNominal Diameter or DistanceBetween Parallel SidesInchesTotal Depth ofDecarburizationInchUp to 0.500, incl 0.010Over 0.500 to 1.000
25、, incl 0.015Over 1.000 to 1.500, incl 0.020Over 1.500 to 2.000, incl 0.025Over 2.000 to 2.500, incl 0.030Over 2.500 to 3.000, incl 0.035Over 3.000 to 4.000, incl 0.045TABLE 3B MAXIMUM DEPTH OF DECARBURIZATION, SI UNITSNominal Diameter or DistanceBetween Parallel SidesMillimetersTotal Depth ofDecarbu
26、rizationMillimetersUp to 12.70, incl 0.25Over 12.70 to 25.40, incl 0.38Over 25.40 to 38.10, incl 0.51Over 38.10 to 50.80, incl 0.64Over 50.80 to 63.50, incl 0.76Over 63.50 to 76.20, incl 0.89Over 76.20 to 101.60, incl 1.143.4.3.4 Decarburization shall be measured by the metallographic method or by a
27、 traverse method using microhardness testing in accordance with ASTM E 384. The microhardness method shall be conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured the microhardness method
28、, is defined as the perpendicular distance from the surface to the depth under that surface where there is no 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. In case of dispute, the
29、depth of decarburization determined using the microhardness traverse method shall govern. 3.4.3.4.1 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)
30、and the width is 0.065 inch (1.65 mm) or less.3.5 QualityThe 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 premium quality conforming to EN 10228, Qu
31、ality Class 4 (See 8.6).SAE INTERNATIONAL AMS6556 Page 5 of 73.5.2 Bars and wire 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, tears, and cracks open to the machined,
32、ground, turned, or polished surface.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 TolerancesAs agreed between vendor and purchaser.4. QUALITY ASSURANCE PROVISIONS4.
33、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 confirmatory testing deemed necessary to ensure that the product conforms
34、to specified requirements.4.2 Classification of Tests4.2.1 Acceptance TestsComposition (3.1), condition (3.3), hardness (3.3.1), response to heat treatment (3.4.1), micro-inclusion rating (3.4.2), freedom of internal defects (3.5.1) and tolerances (3.6) are acceptance tests and shall be performed on
35、 each heat or lot as applicable.4.2.2 Periodic TestsDecarburization (3.4.3) and grain flow of die forgings (3.5.3) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.4.3 Sampling and Testing4.3.1 Bars, Wire, and Forgi
36、ng StockIn accordance with AMS2370.4.3.2 ForgingsIn accordance with AMS2372.4.4 ReportsThe vendor of the product shall furnish with each shipment a report showing the following results of tests and relevent information:4.4.1 The producer of bars, forgings and wire shall furnish with each shipment a
37、report showing the producer name and country where the metal was melted (i.e., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition of each heat, condition, hardness and response to heat treatment of each lot, and stating that the product
38、 conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6556, 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 also
39、 be included.SAE INTERNATIONAL AMS6556 Page 6 of 74.4.2 The producer of forging stock shall furnish with each shipment a report showing the producer name and country where the metal was melted (i.e., final melt in the case of metal processed by multiple melting operations) and the results of tests f
40、or composition, condition hardness and response to heat treatment. This report shall include the purchase order number, heat and lot numbers, AMS6556, product form and size (and/or part number, if applicable), and quantity.4.5 Resampling and Retesting4.5.1 Bars, Wire, and Forging StockIn accordance
41、with AMS2370.4.5.2 ForgingsIn accordance with AMS2372.5. PREPARATION FOR DELIVERY5.1 SizesExcept when exact lengths or multiples of exact lengths are ordered, straight bars and wire 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 suppl
42、ied in lengths shorter than 10 feet (3 m).5.2 Identification5.2.1 Bars and WireIn accordance with AMS2806 for tagging.Line marking is optional.5.2.2 ForgingsIn accordance with AMS2808.5.2.3 Forging StockAs agreed upon by purchaser and vendor.5.3 Protective TreatmentBars ordered cold drawn, cold roll
43、ed, ground, turned, or polished shall be protected from corrosion prior to shipment.5.4 PackagingThe product 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
44、product to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENTA vendor shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modifications authorized by purch
45、aser, will be subject to rejection.SAE INTERNATIONAL AMS6556 Page 7 of 78. NOTES8.1 A change bar (|) located in the left 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
46、to the left of the document title indicates a complete revision of the document, including technical revisions. Change 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 E 140.8.3 Te
47、nsile strength to hardness conversions are presented in ASTM A 370.8.4 Terms used in AMS are clarified in ARP1917.8.5 Dimensions in inch/pound units and the Fahrenheit temperatures are primary; dimensions in SI units and the Celsius temperatures are shown as the approximate equivalents of the primar
48、y units and are presented only for information.8.6 The product has historically been produced using an EN standard.8.7 Purchase documents should specify not less than the following:AMS6556Product form and size (and/or part number, if applicable) of product desiredQuantity of product desired.PREPARED BY AMS COMMITTEE “E“
