1、Designation: A890/A890M 10Standard 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 designation indicates the yearof
2、 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 group of cast duplex stainles
3、ssteels (austenitic/ferritic).1.2 The duplex stainless steel alloys offer a combination ofenhanced mechanical properties and corrosion resistance whenproperly balanced in composition and properly heat treated.Ferrite levels are not specified, but these alloys will develop arange of approximately 30
4、to 60 % ferrite with the balanceaustenite.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two
5、systems may result in non-conformancewith 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 Definitions for Mechanical Testingof Steel ProductsA732/A732M Specification for Castings, Investment, Car-bon and Low Allo
6、y Steel for General Application, andCobalt Alloy for High Strength at Elevated TemperaturesA781/A781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial UseE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE562 Test
7、 Method for Determining Volume Fraction bySystematic Manual Point CountE1245 Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic ImageAnalysis3. Ordering Information3.1 Orders for material to this specification shall include thefollowing, as required, to
8、 describe the material adequately:3.1.1 Description of casting by pattern or drawing number(dimensional tolerance shall be included on the casting draw-ing),3.1.2 Specification designation and grade including year ofissue,3.1.3 Options in the specification (See 9.1), and3.1.4 Supplementary requireme
9、nts desired, including thestandards of acceptance.4. Process4.1 The steel shall be made by the electric furnace processwith or without separate refining such as argon-oxygen-decarburization (AOD).5. Heat Treatment5.1 Castings shall be heat treated in accordance with therequirements in Table 1.NOTE 1
10、Proper heat treatment of these alloys is usually necessary toenhance corrosion resistance and in some cases to meet mechanicalproperties. Minimum heat-treat temperatures are specified; however, it issometimes necessary to heat-treat at higher temperatures, hold for someminimum time at temperature an
11、d then rapidly cool the castings in orderto enhance the corrosion resistance and meet mechanical properties.6. Chemical Composition6.1 The steel shall conform to the requirements as tochemical composition prescribed in Table 2.7. General Requirements7.1 Material furnished to this specification shall
12、 conform tothe requirements of Specification A781/A781M, including anysupplementary requirements that are indicated in the purchaseorder. Failure to comply with the general requirements ofSpecification A781/A781M constitutes nonconformance with1This specification is under the jurisdiction of ASTM Co
13、mmittee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved April 1, 2010. Published May 2010. Originallyapproved in 1988. Last previous edition approved in 2007 as A890/A890M 99(2007). DOI: 10.1520/A0890_A0890M-
14、10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this
15、standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.this specification. In case of conflict between the requirementsof this specification and Specification A781/A781M, thisspecification shall prevail.8. Repair by Welding8.1 The c
16、omposition of the deposited weld metal may besimilar to that of the casting or may be suitably alloyed toachieve the desired corrosion resistance and mechanical prop-erties.8.2 Weld repairs shall be subject to the same qualitystandards as are used to inspect the castings.8.3 When post weld/heat trea
17、tment is believed necessary foradequate corrosion resistance or impact resistance, Sup-plementary Requirement S33 Post Weld/Heat Treatment shallbe included in the purchase order.9. Product Marking9.1 Castings shall be marked for material identification withthe specification designation and grade. In
18、 addition, the manu-facturers name or identification mark and the pattern numbershall be cast or stamped using low-stress stamps on allcastings. Small-size castings may be such that marking must belimited consistent with the available area. The marking of heatnumbers on individual castings shall be
19、agreed upon betweenthe manufacturer and the purchaser. Marking shall be in suchposition as not to injure the usefulness of the casting.10. Keywords10.1 austenite; duplex stainless steel; ferrite; stainless steel;steel castingsTABLE 1 Heat Treatment RequirementsGrade Heat Treatment1B, 1C Heat to 1900
20、F 1040C minimum, hold for sufficient time toheat casting uniformly to temperature, quench in water or rapidcool by other means.2A Heat to 2050F 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,
21、 hold for sufficient time toheat casting uniformly to temperature, quench in water or rapidcool by other means.4A Heat to 2050F 1120C minimum 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 minim
22、um 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 sufficient 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 f
23、or sufficient time toheat casting uniformly to temperature, quench in water or coolrapidly by other means.A890/A890M 102SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purchase order. Alist of standardized supplementary requirements for use
24、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 agreement between the manufactur
25、er and purchaser.S2. 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 Ferrite conte
26、nts shall be determined by point count(Practice E562), by other quantitative metallographic methodssuch as image analysis (Practice E1245), by measurement ofmagnetic response, or by other methods upon agreementbetween the manufacturer and the purchaser. Frequency oftesting and location of tests shal
27、l be by agreement between themanufacturer and the purchaser.S32. Tensile RequirementsS32.1 One tensile test shall be made from each heat andshall conform to the tensile requirements specified in TableS32.1. Test bars shall be poured in special blocks from thesame heat as the castings represented. (S
28、ee S32.4.)S32.2 The bar from which the test specimen is removedshall be heat-treated in production furnaces to the sameprocedure as the 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 coupons may be cast
29、integrally or as separatecast blocks in accordance with Figs. 1 and 2 of SpecificationA781/A781M. Tension coupons shall be machined to the formand dimensions of Fig. 4 of Test Methods and DefinitionsA370, except when investment castings are ordered. WhenTABLE 2 Chemical RequirementsGrade 1BA1CB2ATyp
30、e 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 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
31、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 5AB6ABType 25Cr-5Ni-Mo-N 22Cr-5Ni-Mo-N 25Cr-7Ni-Mo-N 25Cr-7Ni-Mo-NUNS J93371 J92205 J93404 J93380ACI CD6MN CD3MN CE3MN CD3MWCuNComposition:Carbon, max
32、 0.06 0.03 0.03 0.03Manganese, max 1.00 1.50 1.50 1.00Silicon, max 1.00 1.00 1.00 1.00Phosphorus, max 0.040 0.04 0.04 0.030Sulfur, max 0.040 0.020 0.04 0.025Chromium 24.027.0 21.023.5 24.026.0 24.026.0Nickel 4.06.0 4.56.5 6.08.0 6.58.5Molybdenum 1.752.5 2.53.5 4.05.0 3.04.0Copper . . . 1.00, max . .
33、 . 0.51.0Tungsten . . . . . . . . . 0.51.0Nitrogen 0.150.25 0.100.30 0.100.30 0.200.30ACD4MCu has been removed from the standard. CD4MCuN is an acceptable substitute for CD4MCu.B%Cr+3.3%Mo+16%N$ 40.A890/A890M 103investment castings are ordered, the manufacturer may preparetest specimens in accordanc
34、e with S3.2 of Specification A732/A732M. Testing shall be in accordance with Test Methods andDefinitions A370.S32.5 If any specimen shows defective machining or devel-ops flaws, it may be discarded and another substituted from thesame heat.S32.6 To determine conformance with the tension testrequirem
35、ents, an observed value or calculated value shall berounded off in accordance with Practice E29 to the nearest 500psi 5 MPa for yield and tensile strength and to the nearest 1 %for elongation and reduction of area.S33. Post Weld/Heat TreatmentS33.1 Castings shall be heat-treated after major weld re-
36、pairs, but heat treatment after minor weld repairs is notrequired except upon agreement between the manufacturer andthe purchaser.S33.2 Weld repairs shall be considered major in the case ofa casting that has leaked on hydrostatic testing or when thedepth of the cavity after preparation for repair ex
37、ceeds 20 % ofthe actual wall thickness, or 1 in. 25 mm, whichever issmaller, or when the extent of the cavity exceeds approxi-mately 10 in.265 cm2. All other weld repairs shall beconsidered minor.S33.3 Post weld heat treatment shall be in accordance withTable 1.S34. Prior Approval of Weld MaterialS3
38、4.1 The purchaser must give approval of all weld fillermaterials to be used prior to any weld repairs.S35. Heat Treatment of Test MaterialS35.1 Test material for each heat shall be heat-treated withthe castings it represents.SUMMARY OF CHANGESCommittee A01 has identified the location of selected cha
39、nges to this standard since the last issue(A890/A890M 99 (2007) that may impact the use of this standard. (Approved April 1, 2010.)(1) Deleted Grade 1A (CD4MCu)ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this stan
40、dard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be revie
41、wed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsibl
42、e technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Con
43、shohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to
44、 photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE S32.1 Tensile RequirementsGradeType2A24Cr-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 415Elongati
45、on in 2 in. 50 mm, %,minA25 25 25GradeType5A25Cr-7Ni-Mo-N6A25Cr-7Ni-Mo-N1B25Cr-5Ni-Mo-Cu-N1C25Cr-6Ni-Mo-Cu-NTensile strength, ksi MPa, min 100 690 100 690 100 690 100 690Yield strength (0.2 % offset), ksiMPa, min75 515 65 450 70 485 65 450Elongation in 2 in. 50 mm, %,minA18 25 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 104
