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
25、050F 1120C minimum, hold for sufficient time toheat casting uniformly to temperature, quench in water or rapidcool by other means.3A Heat to 1950F 1070C minimum, hold for sufficient time toheat casting uniformly to temperature, quench in water or rapidcool by other means.4A Heat to 2050F 1120C minim
26、um for sufficient time to heatcasting uniformly to temperature and water quench, or thecasting may be furnace cooled to 1850F 1010C minimum,hold for 15 min minimum and then water quench. A rapid coolby other means may be employed in lieu of water quench.5A Heat to 2050F 1120C minimum, hold for suffi
27、cient time toheat casting to temperature, furnace cool to 1910F 1045Cminimum, quench in water or rapid cool by other means.6A Heat to 2010F 1100C minimum, hold for sufficient time toheat casting uniformly to temperature, quench in water or coolrapidly by other means.7A Heat to 2065F 1130C minimum, h
28、old for sufficient time toheat casting to temperature, furnace cool to 1940F 1060Cminimum, quench in water or rapid cool by other means.A890/A890M 122SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purchase order. Alist of standardized suppl
29、ementary requirements for use at the option of the purchaser is included inSpecification A781/A781M. Those that are ordinarily considered suitable for use with this specifica-tion are listed below by title only. Others enumerated in Specification A781/A781M may be used withthis specification upon ag
30、reement between the manufacturer and purchaser.TABLE 2 Chemical RequirementsGrade 1BA1CB2AType 25Cr-5Ni-M0-Cu-N 25Cr-6Ni-Mo-Cu-N 24Cr-10Ni-Mo-NUNS J93372 J93373 J93345ACI CD4MCuN CD3MCuN CE8MNComposition:Carbon, max 0.04 0.030 0.08Manganese, max 1.0 1.20 1.00Silicon, max 1.0 1.10 1.50Phosphorus, max
31、 0.04 0.030 0.04Sulfur, max 0.04 0.030 0.04Chromium 24.526.5 24.0-26.7 22.525.5Nickel 4.76.0 5.6-6.7 8.011.0Molybdenum 1.72.3 2.9-3.8 3.04.5Copper 2.73.3 1.40-1.90 . . .Tungsten . . . . . . . . .Nitrogen 0.100.25 0.22-0.33 0.100.30Grade 3A 4A 5AB6AB7ACType 25Cr-5Ni-Mo-N 22Cr-5Ni-Mo-N 25Cr-7Ni-Mo-N 2
32、5Cr-7Ni-Mo-NType 25Cr-5Ni-Mo-N 22Cr-5Ni-Mo-N 25Cr-7Ni-Mo-N 25Cr-7Ni-Mo-N 27Cr-7Ni-Mo-Cu-NUNS J93371 J92205 J93404 J93380UNS J93371 J92205 J93404 J93380 J93379ACI CD6MN CD3MN CE3MN CD3MWCuNComposition:Carbon, max 0.06 0.03 0.03 0.03Carbon, max 0.06 0.03 0.03 0.03 0.030Manganese, max 1.00 1.50 1.50 1.
33、00Manganese, max 1.00 1.50 1.50 1.00 1.00-3.00Silicon, max 1.00 1.00 1.00 1.00Silicon, max 1.00 1.00 1.00 1.00 1.00Phosphorus, max 0.040 0.04 0.04 0.030Phosphorus, max 0.040 0.04 0.04 0.030 0.030Sulfur, max 0.040 0.020 0.04 0.025Sulfur, max 0.040 0.020 0.04 0.025 0.020Chromium 24.027.0 21.023.5 24.0
34、26.0 24.026.0Chromium 24.027.0 21.023.5 24.026.0 24.026.0 26.028.0Nickel 4.06.0 4.56.5 6.08.0 6.58.5Nickel 4.06.0 4.56.5 6.08.0 6.58.5 6.08.0Molybdenum 1.752.5 2.53.5 4.05.0 3.04.0Molybdenum 1.752.5 2.53.5 4.05.0 3.04.0 2.03.5Copper . 1.00, max . 0.51.0Copper . 1.00, max . 0.51.0 1.00, maxTungsten .
35、 . . 0.51.0Tungsten . . . 0.51.0 3.04.0Nitrogen 0.150.25 0.100.30 0.100.30 0.200.30 0.300.40Boron . . . . 0.0010-0.0100Barium . . . . 0.0010-0.0100Ce+La . . . . 0.0050.030ACD4MCu has been removed from the standard. CD4MCuN is an acceptable substitute for CD4MCu.B%Cr+3.3%Mo+16%N$ 40.C%Cr+3.3(%Mo+0.5%
36、W)+30%N $ 45.A890/A890M 123S2. Radiographic ExaminationS3. Liquid Penetrant ExaminationS5. Examination of Weld PreparationS6. CertificationS7. Prior Approval of Major Weld RepairsS9. Charpy Impact TestS10. Hardness TestS12. Test ReportS13. Unspecified ElementsS31. Estimating Ferrite ContentS31.1 Fer
37、rite contents shall be determined by point count (Practice E562), by other quantitative metallographic methods suchas image analysis (Practice E1245), by measurement of magnetic response, or by other methods upon agreement between themanufacturer and the purchaser. Frequency of testing and location
38、of tests shall be by agreement between the manufacturer andthe purchaser.S32. Tensile RequirementsS32.1 One tensile test shall be made from each heat and shall conform to the tensile requirements specified in Table S32.1. Testbars shall be poured in special blocks from the same heat as the castings
39、represented. (See S32.4.)S32.2 The bar from which the test specimen is removed shall be heat-treated in production furnaces to the same procedure asthe castings it represents.S32.3 Test specimens may be cut from heat-treated castings, at the producers option, instead of from test bars.S32.4 Test cou
40、pons may be cast integrally or as separate cast blocks in accordance with Figs. 1 and 2 of SpecificationA781/A781M. Tension coupons shall be machined to the form and dimensions of Fig. 4 of Test Methods and Definitions A370,except when investment castings are ordered. When investment castings are or
41、dered, the manufacturer may prepare test specimensin accordance with S3.2 of Specification A732/A732M. Testing shall be in accordance with Test Methods and Definitions A370.S32.5 If any specimen shows defective machining or develops flaws, it may be discarded and another substituted from the samehea
42、t.S32.6 To determine conformance with the tension test requirements, an observed value or calculated value shall be rounded offin accordance with Practice E29 to the nearest 500 psi 5 MPa for yield and tensile strength and to the nearest 1 % for elongationand reduction of area.TABLE S32.1 Tensile Re
43、quirementsGradeType2A24Cr-10Ni-Mo-N3A25Cr-5Ni-Mo-N4A22Cr-5Ni-Mo-NTensile strength, ksi MPa, min 95 655 95 655 90 620Yield strength (0.2 % offset), ksiMPa, min65 450 65 450 60 415Elongation in 2 in. 50 mm, %,minA25 25 25GradeType5A25Cr-7Ni-Mo-N6A25Cr-7Ni-Mo-N1B25Cr-5Ni-Mo-Cu-N1C25Cr-6Ni-Mo-Cu-NGradeT
44、ype5A25Cr-7Ni-Mo-N6A25Cr-7Ni-Mo-N7A27Cr-7Ni-Mo-Cu-N1B25Cr-5Ni-Mo-Cu-N1C25Cr-6Ni-Mo-Cu-NTensile strength, ksi MPa, min 100 690 100 690 100 690 100 690Tensile strength, ksi MPa, min 100 690 100 690 100,000 690 100 690 100 690Yield strength (0.2 % offset), ksiMPa, min75 515 65 450 70 485 65 450Yield st
45、rength (0.2 % offset), ksiMPa, min75 515 65 450 75,000 515 70 485 65 450Elongation in 2 in. 50 mm, %,minA18 25 20 16 25AWhen ICI test bars are used in tensile testing as provided for in this specification, the gage length to reduced section diameter ratio shall be 4:1.A890/A890M 124S33. Post Weld/He
46、at TreatmentS33.1 Castings shall be heat-treated after major weld repairs, but heat treatment after minor weld repairs is not required exceptupon agreement between the manufacturer and the purchaser.S33.2 Weld repairs shall be considered major in the case of a casting that has leaked on hydrostatic
47、testing or when the depthof the cavity after preparation for repair exceeds 20 % of the actual wall thickness, or 1 in. 25 mm, whichever is smaller, or whenthe extent of the cavity exceeds approximately 10 in.265 cm2. All other weld repairs shall be considered minor.S33.3 Post weld heat treatment sh
48、all be in accordance with Table 1.S34. Prior Approval of Weld MaterialS34.1 The purchaser must give approval of all weld filler materials to be used prior to any weld repairs.S35. Heat Treatment of Test MaterialS35.1 Test material for each heat shall be heat-treated with the castings it represents.S
49、UMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A890/A890M 10) that may impact the use of this standard. (Approved March 1, 2012.)(1) Added notes on purchaser responsibility to determine suitability of the material characteristics and maximum servicetemperature.(2) Added Grade 7A.Committee A01 has identified the location of selected changes to
