1、Designation: A890/A890M 12 A890/A890M 12aStandard 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 indic
2、ates 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 group of cast
3、duplex stainless steels (austenitic/ferritic).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 will develop a rangeof
4、 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 possibility of precipitat
5、ion 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 be exact equivalents; th
6、erefore, 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 Definitions for Mechanical Te
7、sting 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 Industrial UseE29 Practice
8、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 Analysis3. Ordering Inf
9、ormation3.1 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 designation and grade inc
10、luding year of issue,3.1.3 Options in the specification (See 9.1), and3.1.4 Supplementary requirements desired, including the standards of acceptance.4. Process4.1 The steel shall be made by the electric furnace process with or without separate refining such as argon-oxygen-decarburization (AOD).1 T
11、his specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloysand is the direct responsibility of Subcommittee A01.18on Castings.Current edition approved March 1, 2012Nov. 1, 2012. Published April 2012December 2012. Originally approved in 1988. Last pr
12、evious edition approved in 20102012as A890/A890M 10.A890/A890M 12. DOI: 10.1520/A0890_A0890M-12.10.1520/A0890_A0890M-12A.2 For 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, re
13、fer to the standards Document Summary page on the ASTM website.This 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 c
14、hanges accurately, 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 standardCopyright ASTM International, 100
15、Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Heat Treatment5.1 Castings shall be heat treated in accordance with the requirements in Table 1.NOTE 2Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to mee
16、t mechanical properties.Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at higher temperatures, hold for some minimum time attemperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet mechanical properties.6. C
17、hemical Composition6.1 The steel shall conform to the requirements as to chemical composition prescribed in Table 2.7. General Requirements7.1 Material furnished to this specification shall conform to the requirements of Specification A781/A781M, including anysupplementary requirements that are indi
18、cated in the purchase order. Failure to comply with the general requirements ofSpecification A781/A781M constitutes nonconformance with this specification. In case of conflict between the requirements of thisspecification and Specification A781/A781M, this specification shall prevail.8. Repair by We
19、lding8.1 The composition of the deposited weld metal may be similar to that of the casting or may be suitably alloyed to achievethe desired corrosion resistance 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
20、 weld/heat treatment is believed necessary for adequate corrosion resistance or impact resistance, Sup-plementaryRequirement S33 Post Weld/Heat Treatment shall be included in the purchase order.9. Product Marking9.1 Castings shall be marked for material identification with the specification designat
21、ion and grade. In addition, themanufacturers name or identification mark and the pattern number shall be cast or stamped using low-stress stamps on all castings.Small-size castings may be such that marking must be limited consistent with the available area. The marking of heat numbers onindividual c
22、astings 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. Keywords10.1 austenite; duplex stainless steel; ferrite; stainless steel; steel castingsTABLE 1 Heat Treatment RequirementsGrade Heat Treatment
23、1B, 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 2050F 1120C minimum, hold for sufficient time toheat casting uniformly to temperature, quench in water or rapidcool by other means.3A Heat to 1
24、950F 1070C minimum, 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,ho
25、ld 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 sufficient time toheat casting to temperature, furnace cool to 1910F 1045Cminimum, quench in water or rapid cool by other means.6A Heat to 2010F 11
26、00C minimum, hold for sufficient time toheat casting uniformly to temperature, quench in water or coolrapidly by other means.7A Heat to 2065F 1130C minimum, hold for sufficient time toheat casting to temperature, furnace cool to 1940F 1060Cminimum, quench in water or rapid cool by other means.A890/A
27、890M 12a2SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purchase order. Alist of standardized supplementary requirements for use at the option of the purchaser is included inSpecification A781/A781M. Those that are ordinarily considered sui
28、table 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 manufacturer and purchaser.TABLE 2 Chemical RequirementsGrade 1BA 1CB 2AType 25Cr-5Ni-M0-Cu-N 25Cr-6Ni-Mo-Cu-N 24Cr-10Ni-
29、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 5.6-6.7 8.011.0Molybdenum 1.72.3 2.9-3.8 3.04.
30、5Copper 2.73.3 1.40-1.90 . . .Tungsten . . . . . . . . .Nitrogen 0.100.25 0.22-0.33 0.100.30Grade 3A 4A 5AB 6AB 7ACType 25Cr-5Ni-Mo-N 22Cr-5Ni-Mo-N 25Cr-7Ni-Mo-N 25Cr-7Ni-Mo-N 27Cr-7Ni-Mo-Cu-NType 25Cr-5Ni-Mo-N 22Cr-5Ni-Mo-N 25Cr-7Ni-Mo-N 25Cr-7Ni-Mo-N 27Cr-7Ni-Mo-W-NUNS J93371 J92205 J93404 J93380
31、J93379ACI CD6MN CD3MN CE3MN CD3MWCuN CD3MWNComposition:Carbon, max 0.06 0.03 0.03 0.03 0.030Manganese, max 1.00 1.50 1.50 1.00 1.00-3.00Silicon, max 1.00 1.00 1.00 1.00 1.00Phosphorus, max 0.040 0.04 0.04 0.030 0.030Sulfur, max 0.040 0.020 0.04 0.025 0.020Chromium 24.027.0 21.023.5 24.026.0 24.026.0
32、 26.028.0Nickel 4.06.0 4.56.5 6.08.0 6.58.5 6.08.0Molybdenum 1.752.5 2.53.5 4.05.0 3.04.0 2.03.5Copper . . . 1.00, max . . . 0.51.0 1.00, maxTungsten . . . . . . . . . 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 . . . . . . . .
33、. . . . 0.0010-0.0100Ce + La . . . . . . . . . . . . 0.0050.030A CD4MCu 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%W)+30%N %Cr+3.3(%Mo+0.5%W)+16%N $ 45.A890/A890M 12a3S2. Radiographic ExaminationS3. Liquid Pene
34、trant 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 contents shall be determined by point count (Practice E562), by o
35、ther 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 of tests shall be by agreement between the manufacturer andthe purchas
36、er.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 represented. (See S32.4.)S32.2 The bar from which the test specimen is
37、 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.TABLE S32.1 Tensile RequirementsGradeType2A24Cr-10Ni-Mo-N3A25Cr-5Ni-Mo-N4A22Cr-5Ni-M
38、o-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-N7A27Cr-7Ni-Mo-Cu-N1B25Cr-5Ni-Mo-Cu-N1C25Cr-6Ni-Mo-Cu-NGradeType5A25Cr-7Ni-Mo-N6A25Cr-7Ni-Mo-N7A27Cr-7Ni-
39、Mo-W-N1B25Cr-5Ni-Mo-Cu-N1C25Cr-6Ni-Mo-Cu-NTensile strength, ksi MPa, min 100 690 100 690 100,000 690 100 690 100 690Yield strength (0.2 % offset), ksiMPa, min75 515 65 450 75,000 515 70 485 65 450Elongation in 2 in. 50 mm, %,minA18 25 20 16 25A When ICI test bars are used in tensile testing as provi
40、ded for in this specification, the gage length to reduced section diameter ratio shall be 4:1.A890/A890M 12a4S32.4 Test coupons 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
41、of Fig. 4 of Test Methods and Definitions A370,except when investment castings are ordered. When investment castings are ordered, 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.
42、5 If any specimen shows defective machining or develops flaws, it may be discarded and another substituted from the sameheat.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
43、 psi 5 MPa for yield and tensile strength and to the nearest 1 % for elongationand reduction of area.S33. Post Weld/Heat 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 a
44、nd the purchaser.S33.2 Weld repairs shall be considered major in the case of a casting that has leaked on hydrostatic 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 e
45、xceeds approximately 10 in.2 65 cm2. All other weld repairs shall be considered minor.S33.3 Post weld heat treatment shall 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. H
46、eat Treatment of Test MaterialS35.1 Test material for each heat shall be heat-treated with the castings it represents.A890/A890M 12a5SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A890/A890M 12) that may impact the use of this st
47、andard. (Approved Nov. 1, 2012.)(1) Corrected PREN formula to %Cr+3.3(%Mo+0.5%W)+16%N 45.(2) Corrected “Type” to 27Cr-7Ni-Mo-W-N.(3) Added ACI designation CD3MWN.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A890/A890M 10) that
48、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 this standard since th
49、e 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 standard. 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
