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/AMS5398G AEROSPACE MATERIAL SPECIFICATION AMS5398 REV. G Issued 1955-08 Revised 2011-12 Super
5、seding AMS5398F Steel, Corrosion-Resistant, Sand and Centrifugal Castings 16Cr - 4.1Ni - 0.22Cb (Nb) - 2.8Cu Solution Heat Treated (Composition similar to UNS J92200)RATIONALE AMS5398G clarifies the frequency of ultrasonic inspection for centrifugal castings (4.3.6), and results from a Five Year Rev
6、iew and update of this specification. 1. SCOPE 1.1 Form This specification covers a corrosion-resistant steel in the form of sand or centrifugal castings. 1.2 Application These castings have been used typically for parts requiring corrosion resistance and strength up to 600 F (316 C), but usage is n
7、ot limited to such applications. Certain processing procedures and service conditions may cause these products to become subject to stress-corrosion cracking; ARP1110 recommends practices to minimize such conditions. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date
8、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 document has been specified, the las
9、t 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 724-776-4970 (outside USA), www.sae.org. AMS2175 Castings, Classification and Inspection of AMS2248 C
10、hemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron Alloys AMS2633 Ultrasonic Inspection, Centrifugally-Cast, Corrosion-Resistant Steel Tubular Cylinders AMS2694 In-Process Welding of Castings SAE AMS5398G Page 2 of 10 AMS
11、2700 Passivation of Corrosion Resistant Steels AMS2750 Pyrometry AMS2804 Identification, Castings ARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion Resistant Steels and Alloys 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box
12、 C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A 370 Mechanical Testing of Steel Products ASTM E 353 Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron Alloys ASTM E 446 Reference Radiographs for Steel Castings up to 2 inc
13、hes (51 mm) in Thickness ASTM E 1417 Standard Practice for Liquid Penetrant Testing ASTM E 1444 Standard Practice for Magnetic Particle Testing 3. TECHNICAL REQUIREMENTS 3.1 Composition Castings shall conform to the percentages by weight shown in Table 1, determined in accordance with ASTM E 353, by
14、 spectrochemical methods, or by other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min maxCarbon - 0.06Manganese - 0.70Silicon 0.50 1.00Phosphorus - 0.04Sulfur - 0.03Chromium 15.50 16.70Nickel 3.60 4.60Columbium (Niobium) 0.10 0.35Copper 2.50 3.20Aluminum - 0.05Tin - 0.0
15、2Nitrogen - 0.053.1.1 Vendor may test for any element not listed in Table 1 and include this analysis in the report of 4.5. Limits of acceptability may be specified by purchaser (See 8.2.3). 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2248. SAE AMS5398G P
16、age 3 of 10 3.2 Melting Practice Castings and specimens shall be poured at the casting vendors facility either from a melt (See 8.2.4) of a master heat or directly from a master heat (See 8.2.5). 3.2.1 Revert (gates, sprues, risers, and rejected castings) may be used only in the preparation of maste
17、r heats; revert shall not be remelted directly, without refining, for pouring of castings. Melting of revert creates a new master heat. 3.2.2 Portions of two or more qualified master heats (See 3.4.1) may be melted together and poured into castings using a procedure authorized by purchaser (See 8.2.
18、6). 3.2.3 If modifications such as alloy additions or replenishments are made at remelt by the vendor, vendor shall have a written procedure acceptable to purchaser which defines the controls, tests, and traceability criteria for both castings and separately-cast specimens. Control factors of 4.4.2.
19、2 shall apply. 3.3 Condition Castings shall be delivered in the solution heat treated condition. 3.4 Test Specimens 3.4.1 Each master heat shall be qualified by evaluation of chemical and tensile specimens. 3.4.1.1 If alloy additions or replenishments are made at remelt as in 3.2.3, the frequency of
20、 sampling and testing used by the vendor for qualification shall be acceptable to purchaser. 3.4.1.2 The tensile tests of 3.4.1 are not required if these tests are conducted using integrally-cast specimens (4.3.3.2) or specimens machined from castings (4.3.3.3). 3.4.2 Chemical Analysis Specimens Sha
21、ll be of any convenient size and shape. 3.4.3 Tensile Coupons Shall be attached to castings, as prolongation or integral, if practicable, or shall be standard keel blocks conforming to ASTM A 370, unless purchaser permits use of cast-to-size specimens. Coupons shall be cast with each melt of metal f
22、or castings, shall be cast in molds made of suitable core sand, shall be poured from the same ladles as the castings, and shall be kept in the mold until black. Metal for the coupons shall be part of the melt which is used for the castings. Tensile specimens in accordance with ASTM A 370 shall be ma
23、chined from the coupons after heat treatment as in 3.5. 3.4.3.1 If specimens are separately-cast, vendor shall have a written procedure acceptable to purchaser. Control factors of 4.4.2.2 shall apply. 3.5 Heat Treatment Castings and representative tensile coupons shall be given a homogenization heat
24、 treatment prior to solution heat treatment or, when permitted by purchaser, may be given two solution heat treatments. Pyrometry shall be in accordance with AMS2750. At least one set of tensile coupons shall, during each stage of heat treatment, be put into a batch-type furnace with each load of ca
25、stings or into a continuous furnace at intervals of no longer than 3 hours. 3.5.1 Homogenization Heat Treatment Heat to 2100 F 25 (1149 C 14), hold at heat for not less than 90 minutes, and cool as required to below 70 F (21 C). SAE AMS5398G Page 4 of 10 3.5.2 Solution Heat Treatment Heat to 1900 F
26、25 (1038 C 14), hold at heat for 60 minutes per inch (25 mm) of maximum cross-section but not less than 30 minutes, and cool as required to below 70 F (21 C). 3.6 Properties Castings and representative tensile specimens produced in accordance with 3.4.3 shall conform to the following requirements; h
27、ardness and tensile testing shall be performed in accordance with ASTM A 370. 3.6.1 As Solution Heat Treated 3.6.1.1 Hardness of Castings Shall be not higher than 363 HB, or equivalent (See 8.3). 3.6.2 After Precipitation Heat Treatment Castings and representative tensile specimens shall have the fo
28、llowing properties after being heated to 925 F 15 (496 C 8), held at heat for not less than 90 minutes, and cooled in air to room temperature. Properties after precipitation heat treatment at temperatures other than 925 F 15 (496 C 8) shall be as agreed upon by purchaser and vendor. 3.6.2.1 Tensile
29、Properties of separately-cast coupons or integrally-cast coupons shall be as shown in Table 2. TABLE 2 - MINIMUM TENSILE PROPERTIES Property Value Tensile Strength 180 ksi (1241 MPa) Yield Strength at 0.2% Offset 150 ksi (1034 MPa) Elongation in 4D 6% Reduction of Area 12% 3.6.2.2 Tensile Properties
30、 of Castings When specified on the drawing or when agreed upon by purchaser and vendor, tensile specimens conforming to ASTM A 370 shall be machined from castings selected at random from each lot and heat treated in accordance with 3.6.2. Properties of such specimens shall conform to Table 2 require
31、ments. 3.6.2.3 Hardness Shall be not lower than 375 HB, or equivalent (See 8.3). 3.7 Quality 3.7.1 Castings, as received by purchaser, shall be uniform in quality and condition. Castings shall, to the extent defined in 3.7.2, 3.7.3, 3.7.4, and 3.7.5, or in supplemental standards specified by purchas
32、er be free from porosity, foreign materials, cracks, and other imperfections detrimental to their performance. Castings shall be free of cracks, laps, hot tears, and cold shuts, and free of scale and other surface contamination which would obscure defects. 3.7.1.1 Unless otherwise specified, casting
33、s shall have smooth surfaces and shall be sufficiently cleaned such that, after passivation by the purchaser, cast surfaces shall meet the corrosion test requirement of AMS2700. SAE AMS5398G Page 5 of 10 3.7.2 Castings shall be produced under radiographic control. This control shall consist of radio
34、graphic examination of each casting part number until foundry manufacturing controls in accordance with 4.4.2 have been established. Additional radiography shall be conducted in accordance with the frequency of inspection specified by purchaser or as necessary to ensure continued maintenance of inte
35、rnal quality. 3.7.2.1 Radiographic inspection shall be conducted in accordance with ASTM E 1742 or another method specified by purchaser. 3.7.3 When specified, additional nondestructive testing shall be performed as follows: 3.7.3.1 Fluorescent penetrant inspection in accordance with ASTM E 1417 or
36、another method specified by purchaser. 3.7.3.2 Magnetic particle inspection in accordance with ASTM E 1444 or another method specified by purchaser. 3.7.4 Acceptance standards for radiographic, fluorescent penetrant, magnetic particle, visual, and other inspection methods shall be as agreed upon by
37、purchaser and vendor (See 8.2.8). AMS2175 may be used to specify acceptance standards (casting grade) and frequency of inspection (casting class). 3.7.4.1 When acceptance standards are not specified, Grade C of AMS2175 shall apply for each applicable method of inspection. 3.7.5 Centrifugal castings
38、shall be ultrasonically tested in accordance with AMS2633 and shall conform to the requirements of ultrasonic discontinuity Grade A for longitudinal and shear modes. Testing and acceptance of parts outside of the dimensional limits defined in AMS2633 shall be as agreed upon by purchaser and vendor.
39、3.7.6 Castings shall not be peened, plugged, impregnated, or welded unless authorized by purchaser. 3.7.6.1 When authorized by purchaser, welding in accordance with AMS2694 or another welding program acceptable to purchaser may be used. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspecti
40、on The vendor of castings 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 castings conform to the specified requirements.
41、4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), hardness after solution heat treatment (3.6.1.1), tensile properties after precipitation heat treatment (3.6.2.1), hardness after precipitation heat treatment (3.6.2.3), and applicable requirements of quality (3.7) are acceptance
42、tests and shall be performed as specified in 4.3. 4.2.1.1 Tensile properties of specimens cut from castings shall be determined only when specified by purchaser or when separately-cast coupons or integrally-cast specimens are not available. Tensile properties of separately-cast coupons or integrally
43、-cast specimens need not be determined when tensile properties of specimens cut from castings are determined. 4.2.2 Periodic Tests Corrosion resistance (3.7.1.1) and radiographic soundness (3.7.2) are periodic tests and shall be performed at a frequency selected by vendor unless frequency of testing
44、 is specified by purchaser. SAE AMS5398G Page 6 of 10 4.2.3 Preproduction Tests All technical requirements are preproduction tests and shall be performed on sample castings (4.3.2), when a change in control factors occurs (4.4.2.2), and when purchaser deems confirmatory testing to be required. 4.3 S
45、ampling and Testing Shall be in accordance with the following: 4.3.1 One chemical analysis specimen or a casting from each master heat shall be tested for conformance with Table 1; if 3.4.1.1 applies, test frequency shall be acceptable to purchaser. 4.3.2 One preproduction casting in accordance with
46、 4.4.1 shall be tested to the requirements of the casting drawing and to all technical requirements. 4.3.2.1 Dimensional inspection sample quantity shall be as specified by purchaser. 4.3.3 Tensile tests shall be conducted to determine conformance with 3.6.2. Sampling and test frequency is dependent
47、 upon the type and origin of the specimen specified by purchaser (See 3.6.2) or selected by vendor (See 4.3.3.4). 4.3.3.1 For separately-cast specimens (See 3.4.3.1 and 3.6.2.1), one specimen from each master heat (See 8.2.5) in the precipitation heat treated condition (See 3.6.2). 4.3.3.2 For integ
48、rally-cast specimens (See 3.4.3 and 3.6.2.1), two specimens from each lot (See 8.2.9) in the precipitation heat treated condition (See 3.6.2). 4.3.3.3 For specimens machined from castings (See 3.6.2.2), one casting from each lot (See 8.2.9) in the precipitation heat treated condition (See 3.6.2), te
49、sted at each location shown on the engineering drawing. 4.3.3.3.1 When size and location of specimens are not shown, two test specimens shall be tested, one from the thickest section and one from the thinnest section. Once established under 4.4.2.2, test locations may be changed only as agreed upon by purchaser and vendor. 4.3.3.4 When acceptable to purchaser, specimens machined from casting may be used in
