ASTM A890 A890M-2012 Standard Specification for Castings Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant Duplex (Austenitic Ferritic) for General Application 《普通应用的铁铬镍钼耐腐蚀双重(奥氏.pdf
《ASTM A890 A890M-2012 Standard Specification for Castings Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant Duplex (Austenitic Ferritic) for General Application 《普通应用的铁铬镍钼耐腐蚀双重(奥氏.pdf》由会员分享,可在线阅读,更多相关《ASTM A890 A890M-2012 Standard Specification for Castings Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant Duplex (Austenitic Ferritic) for General Application 《普通应用的铁铬镍钼耐腐蚀双重(奥氏.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation:A890/A890M10 Designation: A890/A890M 12Standard Specification forCastings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for GeneralApplication1This standard is issued under the fixed designation A890/A890M; the number immediately following the designa
2、tion indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers a grou
3、p of cast duplex stainless steels (austenitic/ferritic).1.2The duplex stainless steel alloys offer a combination of enhanced mechanical properties and corrosion resistance whenproperly balanced in composition and properly heat treated. Ferrite levels are not specified, but these alloys will develop
4、a rangeof approximately 30 to 60% ferrite with the balance austenite.1.2 The duplex stainless steel alloys offer a combination of enhanced mechanical properties and corrosion resistance whenproperly balanced in composition and properly heat treated. Ferrite levels are not specified, but these alloys
5、 will develop a rangeof approximately 30 to 60 % ferrite with the balance austenite. It is the responsibility of the purchaser to determine which gradeshall be furnished depending on design and service conditions, mechanical properties, and corrosion-resistant characteristics.NOTE 1Because of the po
6、ssibility of precipitation of embrittling phases, the grades included in this specification are not recommended for serviceat temperatures above 600F 315C.1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not b
7、e exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.3.1 Within the text, the SI units are shown in brackets.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Defini
8、tions for Mechanical Testing of Steel ProductsA732/A732M Specification for Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloyfor High Strength at Elevated TemperaturesA781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Indu
9、strial UseE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE562 Test Method for Determining Volume Fraction by Systematic Manual Point CountE1245 Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic Image
10、Analysis3. Ordering Information3.1 Orders for material to this specification shall include the following, as required, to describe the material adequately:3.1.1 Description of casting by pattern or drawing number (dimensional tolerance shall be included on the casting drawing),3.1.2 Specification de
11、signation and grade including year of issue,3.1.3 Options in the specification (See 9.1), and3.1.4 Supplementary requirements desired, including the standards of acceptance.1This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the dir
12、ect responsibility of Subcommittee A01.18on Castings.Current edition approved April 1, 2010. Published May 2010. Originally approved in 1988. Last previous edition approved in 2007 as A890/A890M99 (2007). DOI:10.1520/A0890_A0890M-10.Current edition approved March 1, 2012. Published April 2012. Origi
13、nally approved in 1988. Last previous edition approved in 2010 as A890/A890M 10. DOI:10.1520/A0890_A0890M-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the st
14、andards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accur
15、ately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor
16、 Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Process4.1 The steel shall be made by the electric furnace process with or without separate refining such as argon-oxygen-decarburization (AOD).5. Heat Treatment5.1 Castings shall be heat treated in accordance with the requireme
17、nts in Table 1.NOTE1Proper 2Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanicalproperties. Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at higher temperatures, hold for some
18、minimum time at temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet mechanical properties.6. Chemical Composition6.1 The steel shall conform to the requirements as to chemical composition prescribed in Table 2.7. General Requirements7.1 Material furni
19、shed to this specification shall conform to the requirements of Specification A781/A781M, including anysupplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements ofSpecificationA781/A781M constitutes nonconformance with this specification. In
20、 case of conflict between the requirements of thisspecification and Specification A781/A781M, this specification shall prevail.8. Repair by Welding8.1 The composition of the deposited weld metal may be similar to that of the casting or may be suitably alloyed to achievethe desired corrosion resistan
21、ce and mechanical properties.8.2 Weld repairs shall be subject to the same quality standards as are used to inspect the castings.8.3 When post weld/heat treatment is believed necessary for adequate corrosion resistance or impact resistance, Sup-plementaryRequirement S33 Post Weld/Heat Treatment shal
22、l be included in the purchase order.9. Product Marking9.1 Castings shall be marked for material identification with the specification designation and grade. In addition, themanufacturers name or identification mark and the pattern number shall be cast or stamped using low-stress stamps on all castin
23、gs.Small-size castings may be such that marking must be limited consistent with the available area. The marking of heat numbers onindividual castings shall be agreed upon between the manufacturer and the purchaser. Marking shall be in such position as not toinjure the usefulness of the casting.10. K
24、eywords10.1 austenite; duplex stainless steel; ferrite; stainless steel; steel castingsTABLE 1 Heat Treatment RequirementsGrade Heat Treatment1B, 1C Heat to 1900F 1040C minimum, hold for sufficient time toheat casting uniformly to temperature, quench in water or rapidcool by other means.2A Heat to 2
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