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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (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/AMS5338H AEROSPACE MATERIAL SPECIFICATION AMS5338 REV. H Issued 1957-07 Reaffirmed 2006-04 Revi
5、sed 2017-09 Superseding AMS5338G Steel, Investment Castings 0.95Cr - 0.20Mo (0.35 - 0.45C) (4140 Mod) Normalized or Normalized and Tempered (Composition similar to UNS J14046) RATIONALE AMS5338H is a Five-Year Review and update of this specification that adds strain rate control on tensile testing (
6、3.6.1.1), revises reporting (4.5), and outside specification limits notification (4.5.2). 1. SCOPE 1.1 Form This specification covers a low-alloy steel in the form of investment castings. 1.2 Application These castings have been used typically for small structural parts of intricate design requiring
7、 heat treatment to minimum tensile strengths up to 175 ksi (1207 MPa), but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS 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 suppli
8、er 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 last published issue of that document shall apply. 2.1 SAE Publications Available from SAE Internation
9、al, 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. AMS2175 Castings, Classification and Inspection of AMS2259 Chemical Check Analysis Limits Wrought Low-Alloy and Carbon Steels AMS2360 Room Temperature Tensi
10、le Properties of Castings AMS2694 In-Process Welding of Castings SAE INTERNATIONAL AMS5338H Page 2 of 10 AMS2804 Identification Castings AMS-H-6875 Heat Treatment of Steel Raw Materials ARP1917 Clarification of Terms Used in Aerospace Metals Specifications 2.2 ASTM Publications Available from ASTM I
11、nternational, 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 E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial
12、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 E1417 Liquid Penetrant Testing ASTM E1444 Magnetic Particle Testing ASTM E1742 Radiographic Examination 3. TECHN
13、ICAL REQUIREMENTS 3.1 Composition Castings 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 acceptable to purchaser (see 8.2.1 and 8.2.2). Table 1 - Composition Ele
14、ment Min Max Carbon Manganese Silicon Phosphorus Sulfur Chromium Molybdenum Nickel Copper 0.35 0.75 - - - 0.80 0.15 - - 0.45 1.00 1.00 0.04 0.04 1.10 0.25 0.25 0.35 3.1.1 Producer may test for any element not listed in Table 1 and include this analysis in the report of 4.5. Limits of acceptability m
15、ay be specified by purchaser (see 8.2.3). 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. The foundry shall not use the variation allowances to determine conformance of castings or specimens to 3.1. 3.2 Melting Practice Castings and specimens shall be p
16、oured at casting producers facility either from a melt (see 8.2.4) of a master heat or directly from a master heat (see 3.4.3 and 8.2.5). SAE INTERNATIONAL AMS5338H Page 3 of 10 3.2.1 Revert (gates, sprues, risers, and rejected castings) may be used only in the preparation of master heats; revert sh
17、all 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 3.4.2) may be melted together and poured into castings using a procedure authorized by purchaser (see 8.2.6). 3.2.3 If modific
18、ations, such as alloy additions or replenishments (see 8.2.10), are made by the producer at remelt, producer shall have a written procedure acceptable to purchaser that defines the controls, test, and traceability criteria for both castings and separately-cast specimens. Control factors of 4.4.2.2 s
19、hall apply. 3.3 Condition Castings shall be delivered in the normalized condition, or, when required, in the normalized and tempered condition (see 3.5). 3.4 Test Specimens Specimens shall be separately-cast, integrally-cast (see 8.2.7) or machined from castings, and shall conform to 3.2. 3.4.1 If s
20、pecimens are separately-cast, producer shall have a written procedure acceptable to purchaser. Control factors of 4.4.2.2 shall apply. 3.4.2 Each master heat shall be qualified by evaluation of chemical, hardness, and tensile specimens. 3.4.2.1 If alloy additions or replenishments are made at remelt
21、 as in 3.2.3, the frequency of sampling and testing used by the producer for qualification to 3.4.2 shall be acceptable to purchaser. 3.4.2.2 Tensile tests of 3.4.2 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).
22、3.4.3 Chemical Analysis Specimens Shall be of any convenient size and shape. 3.4.4 Tensile Specimens Shall be of standard proportions in accordance with ASTM A370 with 0.250 inch (6.35 mm) diameter at the reduced parallel gage section. 3.4.4.1 Separately-cast and integrally-cast specimens may be eit
23、her cast to size or cast oversize and subsequently machined to 0.250 inch (6.35 mm) diameter. 3.4.4.2 When integrally-cast specimens and specimens machined from castings are specified, specimen size and location shall be as agreed upon by purchaser and producer (see 8.2.8 and 8.6). 3.4.5 Hardness Sp
24、ecimens for Response to Heat Treatment May be a representative specimen or a casting. 3.5 Heat Treatment To produce the condition in castings for delivery, normalize, or when required, normalize and temper, in accordance with AMS-H-6875 except as specified in 3.5.1 to conform to hardness of 3.6.2.1.
25、 SAE INTERNATIONAL AMS5338H Page 4 of 10 3.5.1 Production Castings and Specimens 3.5.1.1 Normalize Heat to a selected temperature in the range of 1650 to 1700 F (899 to 927 C), in an atmosphere neutral to the specified carbon range, hold at heat for not less than one hour, and cool at a rate equival
26、ent to that obtained in still air. 3.5.1.2 Temper When required, heat to a temperature not lower than 900 F (482 C). 3.5.2 Response to Heat Treatment Castings or specimens for testing after hardening and tempering shall be heat treated as in 3.5.1 and the following: 3.5.2.1 Harden Heat to 1600 F 25
27、F (871 C 14 C), in an atmosphere neutral to the specified carbon range, hold at heat for not less than 30 minutes, and quench in oil or at a rate equivalent to oil quenching. 3.5.2.2 Temper Heat to a temperature not lower than 900 F (482 C), hold at heat for one hour per inch (25 mm) of cross-sectio
28、n but not less than one hour, and cool in air. 3.5.3 Tensile specimens used for master heat qualification may be heat treated separately from castings. 3.6 Properties Conformance shall be based upon testing of separately-cast specimens unless purchaser specifies integrally-cast specimens or specimen
29、s machined from a castings. Properties of integrally-cast specimens or specimens machined from castings shall be as specified by purchaser. 3.6.1 Room Temperature Tensile Properties Shall be shown in Table 2, determined in accordance with ASTM A370, after heat treatment in accordance with 3.5.1 and
30、3.5.2. Properties other than those listed may be defined as specified in AMS2360. Table 2 - Minimum tensile properties Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in 4D Reduction of Area 175 ksi (1207 MPa) 160 ksi (1103 MPa) 3% 6% 3.6.1.1 The strain rate shall be set at
31、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 machine shall be set between 0.05 and 0.5 inch/inch (mm/mm) of the length of the reduced sec
32、tion (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 inch/inch/min (mm/mm/minute) 3.6.2 Hardness Shall be as follows, determined in accordance with
33、ASTM A370. SAE INTERNATIONAL AMS5338H Page 5 of 10 3.6.2.1 Production Castings as Normalized or Normalized and Tempered Shall be not higher than 30 HRC, or equivalent (see 8.3). 3.6.2.2 Hardness as a Response to Heat Treatment Castings or specimens as hardened and tempered shall be 38 to 43 HRC, or
34、equivalent (see 8.3). 3.6.3 Carburization or Decarburization The carbon content shall be within the limits of 3.1 throughout the casting except within 0.003 inch (0.08 mm) of the surface. 3.7 Quality 3.7.1 Castings, as received by purchaser, shall be uniform in quality and condition, sound, and free
35、 from foreign materials and from imperfections detrimental to usage of the castings. Castings shall be free of cracks, laps, hot tears, and cold shuts, and free of scale and other process-induced surface contamination that would obscure defects. 3.7.2 Castings shall be produced under radiographic co
36、ntrol. This control shall consist of radiographic 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 neces
37、sary to ensure continued maintenance of internal quality. 3.7.2.1 Radiographic examinations shall be conducted in accordance with ASTM E1742 or other process method specified by purchaser. 3.7.3 When specified, additional nondestructive testing shall be performed as follows: 3.7.3.1 Fluorescent pene
38、trant testing in accordance with ASTM E1417 or other process method specified by purchaser. 3.7.3.2 Magnetic particle testing in accordance with ASTM E1444 or other method specified by purchaser. 3.7.4 Acceptance standards for radiographic, magnetic particle, fluorescent penetrant, visual, and other
39、 inspection methods shall be as agreed upon by purchaser and producer (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 and radiographic ind
40、ications of gas holes, sand spots, and inclusions shall be cause for rejection when closer to the edge than twice their maximum dimension. 3.7.5 Castings shall not be peened, plugged, impregnated, or welded unless authorized by purchaser. 3.7.5.1 When authorized by purchaser, welding in accordance w
41、ith AMS2694 or other welding program acceptable to purchaser may be used. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of castings shall supply all samples for producers tests and shall be responsible for the performance of all required tests. Purchaser reserves the
42、 right to sample and to perform any confirmatory testing deemed necessary to ensure that the castings conform to specified requirements. SAE INTERNATIONAL AMS5338H Page 6 of 10 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.6.1), hardness (3.6.2.1 and 3.6
43、.2.2), and the applicable requirements of quality (3.7) are acceptance tests and shall be performed as specified in 4.3. 4.2.2 Periodic Tests Carburization/decarburization (3.6.3) and radiographic soundness (3.7.3) are periodic tests and shall be performed at a frequency selected by the producer unl
44、ess frequency of testing is specified by the purchaser. 4.2.3 Preproduction Tests All technical requirements are preproduction tests and shall be performed on specimens or sample castings (4.3), when a change in control factors occurs (4.4.2.2), and when purchaser deems confirmatory testing to be re
45、quired. 4.3 Sampling and Testing The minimum testing performed by producer 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, unless 3.4.2.1 applies, in which case frequency of testing shall
46、 be acceptable to purchaser. 4.3.2 One preproduction casting in accordance with 4.4 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
47、to determine conformance with Table 2. Sampling and test frequency is dependent upon the type and origin of specimen specified by purchaser (see 3.6) or selected by producer (see 4.3.3.4). When 3.4.2.1 applies, test frequency shall be acceptable to purchaser. 4.3.3.1 For separately-cast specimens in
48、 hardened and tempered condition of 3.5.2, one or more specimens from each master heat shall be tested for conformance with 3.6.1. 4.3.3.2 For integrally-cast specimens in the hardened and tempered condition of 3.5.2, at least two specimens from each lot shall be tested for conformance with 3.6. 4.3
49、.3.3 For specimens machined from casting, one or more castings shall be randomly selected from each lot and tested in the hardened and tempered condition of 3.5.2 at locations shown on the engineering drawing for conformance with 3.6. 4.3.3.3.1 When size and location of specimens are not shown, at least two test specimens shall be tested, one from the thickest section and one from the thinnest section. Once established
