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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication m
3、ay 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 (outside U
4、SA) 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/AMS5898A AEROSPACE MATERIAL SPECIFICATION AMS 5898 REV. A Issued 1995-02 Revised 2001-03 Reaf
5、firmed 2011-10 Superseding AMS 5898 Steel, Corrosion Resistant, Bars, Wire, and Forgings 15.2Cr - 1.0Mo - 0.40N - (0.28 - 0.34C) Consumable Electrode Melted Under Pressure 1. SCOPE:1.1 Form: This specification covers a premium aircraft-quality, corrosion-resistant steel in the form of bars, wire, fo
6、rgings, and forging stock.1.2 Application: These products have been used typically for anti-friction bearing components requiring resistance to both corrosion and wear with hardness not lower than 58 HRC after hardening and tempering, but usage is not limited to such applications.2. APPLICABLE DOCUM
7、ENTS: The 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 specific document issue is specified. When the referenced document has been
8、canceled and no superseding document has been specified, the last published issue of that document shall apply.2.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2241 Tolerances, Corrosion Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bar
9、s and WireMAM 2241 Tolerances, Metric, Corrosion Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and WireAMS 2248 Chemical Check and Analysis Limits, Corrosion and Heat Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron AlloysAMS 2300 Premium Aircraft
10、-Quality Steel Cleanliness, Magnetic Particle Inspection ProcedureSAE AMS 5898A Page 2 of 8 2.1 (Continued):MAM 2300 Premium Aircraft-Quality Steel Cleanliness, Magnetic Particle Inspection Procedure, Metric (SI) MeasurementAMS 2371 Quality Assurance Sampling and Testing, Corrosion and Heat Resistan
11、t Steels and Alloys, Wrought Products and Forging StockAMS 2374 Quality Assurance Sampling and Testing, Corrosion and Heat Resistant Steel and Alloy ForgingsAMS 2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat Resistant Steels and All
12、oysAMS 2808 Identification, ForgingsAS1182 Standard Machining Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM A 370 Mechanical Testing of Steel ProductsAS
13、TM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and BilletsASTM E 45 Determining the Inclusion Content of SteelASTM E 112 Determining the Average Grain SizeASTM E 353 Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron Alloys3. TECH
14、NICAL REQUIREMENTS: 3.1 Composition: Shall 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.TABLE 1 - CompositionElement min maxCarbon 0.28 0.34M
15、anganese 0.30 0.60Silicon 0.30 0.80Phosphorus - 0.020Sulfur - 0.010Chromium 14.5 16.0Molybdenum 0.95 1.10Nitrogen 0.35 0.44 Nickel - 0.30 SAE AMS 5898A Page 3 of 8 3.1.1 Check Analysis: Composition variations shall meet the applicable requirements of AMS 2248.3.2 Melting Practice: Steel shall be mul
16、tiple melted using consumable electrode practice under pressurized protective gas in the remelt cycle to enable nitrogen to be dissolved in the steel to the desired extent.3.3 Condition: The product shall be supplied in the following condition; hardness and tensile strength shall be determined in ac
17、cordance with ASTM A 370.3.3.1 Bars: Annealed, having hardness not higher than 255 HB, or equivalent (See 8.2).3.3.1.1 Bars 2.750 Inches (69.85 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides, and All Hexagons: Cold finished.3.3.1.2 Bars, Other Than Hexagons, Over 2.750 In
18、ches (69.85 mm) in Nominal Diameter or Least Distance Between Parallel Sides: Hot finished.3.3.2 Wire: Annealed and cold finished having a tensile strength not higher than 130 ksi (896 MPa) or equivalent hardness (See 8.3).3.3.3 Forgings: As ordered.3.3.4 Forging Stock: As ordered by the forging man
19、ufacturer.3.4 Properties: The product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A 370.3.4.1 Macrostructure: Visual examination of transverse full cross-sections from bars, wire, billets, and forging stock, etched in hot hydrochloric acid
20、 in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections for product 36 square inches (232 cm2) and under in nominal cross-sectional area shall be no worse than the macrographs of ASTM A 604 shown in Table 2.TABLE 2 - Macrostructure Lim
21、itsClass Condition Severity1 Freckles A2 White spots A3 Radial segregation B4 Ring pattern BSAE AMS 5898A Page 4 of 8 3.4.2 Micro-Inclusion Rating: No specimen shall exceed the limits of Table 3, determined in accordance with ASTM E 45, Method D.3.4.2.1 A rateable field is defined as one which has a
22、 type A, B, C, or D inclusion rating of at least No. 1.0 thin or heavy in accordance with the Jernkontoret Chart, Plate III, ASTM E 45.3.4.3 Microstructure: The product shall be free of carbide network.3.4.4 Average Grain Size: Shall be ASTM No. 6 or finer, determined in accordance with ASTM E 112.3
23、.4.5 Decarburization and Denitridation: 3.4.5.1 Bars and wire ordered ground, turned, or polished shall be free from decarburization and/or denitridation on the ground, turned, or polished surfaces.3.4.5.2 Allowable decarburization and/or denitridation of bars, wire, and billets ordered for redrawin
24、g or forging or to specified microstructural requirements shall be as agreed upon by purchaser and vendor.3.4.5.3 Decarburization and/or denitridation of bars and wire, to which 3.4.5.1 or 3.4.5.2 is not applicable, shall not be greater than shown in Table 4.TABLE 3 - Micro-Inclusion Rating LimitsTy
25、peAThinAHeavyBThinBHeavyCThinCHeavyDThinDHeavyWorst Field Severity 2.0 1.0 1.5 1.0 1.0 1.0 1.5 1.0Worst FieldFrequency, max a 1 a 1 a 1 3 1Total Rateable Fields,Frequency, max b 1 b 1 b 1 8 1aCombined A+B+C, not more than 3 fieldsbCombined A+B+C, not more than 8 fieldsSAE AMS 5898A Page 5 of 8 3.4.5
26、.4 Decarburization and denitridation shall be measured by the metallographic method, by the HR 30N scale hardness testing method, or by the microhardness traverse method on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon/nitrogen content. Depth
27、 of decarburization or denitridation, when measured by a hardness method, is defined as the perpendicular distance from the surface to the depth under that surface below which there is no further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninflu
28、enced by any decarburization/denitridation on the adjacent surface. In case of dispute, the depth of decarburization/denitridation determined using the microhardness traverse method shall govern.3.4.5.4.1 When determining the depth of decarburization/denitridation it is permissible to disregard loca
29、l areas provided the decarburization/denitridation 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.TABLE 4A - Maximum Decarburization/Denitridation, Inch/Pound UnitsNominal Diameter or DistanceBetween Parallel SidesInches
30、Total Depth ofDecarburization/DenitridationInchUp to 0.50, incl 0.015Over 0.50 to 1.00, incl 0.020Over 1.00 to 1.50, incl 0.025Over 1.50 to 2.00, incl 0.030Over 2.00 to 2.50, incl 0.035Over 2.50 to 3.00, incl 0.040Over 3.00 to 4.00, incl 0.045TABLE 4B - Maximum Decarburization/Denitridation, SI Unit
31、sNominal Diameter or DistanceBetween Parallel SidesMillimetersTotal Depth ofDecarburization/DenitridationMillimetersUp to 12.70, incl 0.38Over 12.70 to 25.40, incl 0.51Over 25.40 to 38.10, incl 0.64Over 38.10 to 50.80, incl 0.76Over 50.80 to 63.50, incl 0.89Over 63.50 to 76.20, incl 1.02Over 76.20 t
32、o 101.60, incl 1.14SAE AMS 5898A Page 6 of 8 3.4.6 Response to Heat Treatment: Specimens as in 4.3.3, protected by suitable means or treated in a neutral atmosphere to minimize scaling and prevent either carburization or decarburization, still have hardness not lower than 58 HRC, or equivalent (See
33、8.2), after being heated to 1925 F 25 (1052 C 14), held at heat for 30 minutes 3, and quenched in oil, and tempered at 350 F 10 (177 C 6) for 60 minutes 5.3.4.6.1 Sub-zero cooling to -100 F 20 (-73 C 11), holding at that temperature for 2 hours 0.25, and warming in air to room temperature after oil
34、quenching as in 3.4.6 is optional.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 premium aircraft-quality conforming to AMS 2300 or M
35、AM 2300.3.5.2 Bars and wire ordered hot rolled or cold drawn or ground, turned, or polished shall, after removal of the standard machining allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the ground, turned, or polished surfaces.3.5.3 Grain flow of die forging
36、s, except in areas which contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow.3.6 Tolerances: Bars and wires shall conform to all applicable requirements of AMS 2241 or MAM 2241.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility
37、for Inspection: The 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 to specified re
38、quirements.4.2 Classification of Tests: 4.2.1 Acceptance Tests: Composition (3.1), condition (3.3), macrostructures (3.4.1), micro-inclusion rating (3.4.2), microstructure (3.4.3), average grain size (3.4.4), decarburization and denitridation (3.4.5), response to heat treatment (3.4.6), quality (3.5
39、), and tolerance (3.6) are acceptance tests and shall be performed on each heat or lot, as applicable.4.2.2 Periodic Tests: Grain flow of die forgings (3.5.3) is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.SAE AMS
40、 5898A Page 7 of 8 4.3 Sampling and Testing: Shall be as follows:4.3.1 Bars, Wire and Forging Stock: In accordance with AMS 2371.4.3.2 Forgings: In accordance with AMS 2374.4.3.3 Specimens for response to heat treatment (3.4.6) from bars, wire, and billets shall be not less than 0.375 inch (9.52 mm)
41、 in thickness. Minimum dimensions in other directions shall be either those of the product cross-section or 1.125 x 1.125 inches (28.58 x 28.58 mm).4.4 Reports: The vendor of the product shall furnish with each shipment a report showing the results of tests for chemical composition, macrostructure,
42、micro-inclusion rating, and frequency-severity cleanliness rating of each heat, and for microstructure, average grain size, and response to heat treatment of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat
43、 and lot numbers, AMS 5898A, size, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included.4.5 Resampling and Retesting: Shall be as follows:4.5.1 Bars, Wire, and Forging Stock: In accordance with AMS 2371.4.5.2 Forgings: In accordan
44、ce with AMS 2374.5. PREPARATION FOR DELIVERY: 5.1 Sizes: Except 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 supplied in lengths shorter than 10 fe
45、et (3 m).5.2 Identification: Shall be as follows:5.2.1 Bars and Wire: In accordance with AMS 2806.5.2.2 Forgings: In accordance with AMS 2808.5.2.3 Forging Stock: As agreed upon by purchaser and vendor.SAE AMS 5898A Page 8 of 8 5.3 Packaging: The product shall be prepared for shipment in accordance
46、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. ACKNOWLEDGEMENT: A vendor shall mention this specification number and its revision letter in all
47、 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 A change bar ( l ) located in the left margin is for the convenience of the user in locating areas w
48、here technical revisions, not editorial changes, have been made to the previous issue of this specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical revisions. Change bars and (R) are not used in original publications, n
49、or in specifications that contain editorial changes only.8.2 Hardness conversion tables for metals are presented in ASTM E 140.8.3 Tensile strength to hardness conversions are presented in ASTM A 370.8.4 Terms used in AMS are clarified in ARP1917.8.5 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsiu
