Designation:A890/A890M–12
Standard Specification for
Castings,Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant,Duplex(Austenitic/Ferritic)for General Application1
This standard is issued under thefixed designation A890/A890M;the number immediately following the designation indicates the year of original adoption or,in the ca of revision,the year of last revision.A number in parenthes indicates the year of last reapproval.
A superscript epsilon(´)indicates an editorial change since the last revision or reapproval.
1.Scope*
1.1This specification covers a group of cast duplex stainless steels(austenitic/ferritic).
1.2The duplex stainless steel alloys offer a combination of enhanced mechanical properties and corrosion resistance when properly balanced in composition and properly heat treated. Ferrite levels are not specified,but the alloys will develop a range of approximately30to60%ferrite with the balance austenite.It is the responsibility of the purchar to determine which grade shall be furnished depending on design and rvice conditions,mechanical properties,and corrosion-resistant characteristics.
N OTE1—Becau of the possibility of precipitation of embrittling phas,the grades included in this specification are not recommended for rvice at temperatures above600ºF[315ºC].
1.3The values stated in either SI units or inch-pound units are to be regarded parately as standard.The values stated in each system may not be exact equivalents;therefore,each system shall be ud independently of the other.Combining values from the two systems may result in non-conformance with the standard.
1.3.1Within the text,the SI units are shown in brackets.
2.Referenced Documents
2.1ASTM Standards:2
A370Test Methods and Definitions for Mechanical Testing of Steel Products
A732/A732M Specification for Castings,Investment,Car-bon and Low Alloy Steel for General Application,and Cobalt Alloy for High Strength at Elevated Temperatures A781/A781M Specification for Castings,Steel and Alloy, Common Requirements,for General Industrial U
E29Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E562Test Method for Determining V olume Fraction by Systematic Manual Point Count
E1245Practice for Determining the Inclusion or Second-Pha Constituent Content of Metals by Automatic Image Analysis
3.Ordering Information
3.1Orders for material to this specification shall include the following,as required,to describe the mat
erial adequately: 3.1.1Description of casting by pattern or drawing number (dimensional tolerance shall be included on the casting draw-ing),
3.1.2Specification designation and grade including year of issue,
3.1.3Options in the specification(See9.1),and
3.1.4Supplementary requirements desired,including the standards of acceptance.
4.Process
4.1The steel shall be made by the electric furnace process with or without parate refining such as argon-oxygen-decarburization(AOD).
5.Heat Treatment
5.1Castings shall be heat treated in accordance with the requirements in Table1.
N OTE2—Proper heat treatment of the alloys is usually necessary to enhance corrosion resistance and in some cas to meet mechanical properties.Minimum heat-treat temperatures are specified;however,it is sometimes necessary to heat-treat at higher temperatures,hold for some
几岁学钢琴最合适
1This specification is under the jurisdiction of ASTM Committee A01on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18on Castings.
Current edition approved March1,2012.Published April2012.Originally
approved in1988.Last previous edition approved in2010as A890/A890M–10.
DOI:10.1520/A0890_A0890M-12.
2For referenced ASTM standards,visit the ASTM website,www.astm,or
contact ASTM Customer Service at rvice@astm.For Annual Book of ASTM
Standards volume information,refer to the standard’s Document Summary page on
the ASTM website.
三个优先
*A Summary of Changes ction appears at the end of this standard. Copyright©ASTM International,
100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States. --``,,,``,,,``,,```,``,,`,`,`,,,-`-`,,`,,`,`,,`---
minimum time at temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet mechanical properties.6.Chemical Composition
6.1The steel shall conform to the requirements as to chemical composition prescribed in Table2.
7.General Requirements
7.1Material furnished to this specification shall conform to the requirements of Specification A781/A781M,including any supplementary requirements that are indicated in the purcha order.Failure to comply with the general requirements of Specification A781/A781M constitutes nonconformance with this specification.In ca of conflict between the requirements of this specification and Specification A781/A781M,this specification shall prevail.
8.Repair by Welding
8.1The composition of the deposited weld metal may be similar to that of the casting or may be suitably alloyed to achieve the desired corrosion resistance and mechanical prop-erties.
8.2Weld repairs shall be subject to the same quality standards as are ud to inspect the castings.
TABLE1Heat Treatment Requirements
Grade Heat Treatment
1B,1C Heat to1900°F[1040°C]minimum,hold for sufficient time to
heat casting uniformly to temperature,quench in water or rapid
cool by other means.
2A Heat to2050°F[1120°C]minimum,hold for sufficient time to
heat casting uniformly to temperature,quench in water or rapid
cool by other means.
3A Heat to1950°F[1070°C]minimum,hold for sufficient time to
heat casting uniformly to temperature,quench in water or rapid
cool by other means.
4A Heat to2050°F[1120°C]minimum for sufficient time to heat
casting uniformly to temperature and water quench,or the工作领域
casting may be furnace cooled to1850°F[1010°C]minimum,
hold for15min minimum and then water quench.A rapid cool
by other means may be employed in lieu of water quench.
5A Heat to2050°F[1120°C]minimum,hold for sufficient time to
heat casting to temperature,furnace cool to1910°F[1045°C]
minimum,quench in water or rapid cool by other means.
6A Heat to2010°F[1100°C]minimum,hold for sufficient time to
heat casting uniformly to temperature,quench in water or cool
rapidly by other means.
7A Heat to2065°F[1130°C]minimum,hold for sufficient time to
heat casting to temperature,furnace cool to1940°F[1060°C]
minimum,quench in water or rapid cool by other means.
TABLE2Chemical Requirements
Grade1B A1C B2A
Type25Cr-5Ni-M0-Cu-N25Cr-6Ni-Mo-Cu-N24Cr-10Ni-Mo-N
UNS J93372J93373J93345
ACI CD4MCuN CD3MCuN CE8MN
Composition:
Carbon,max0.040.0300.08
Mangane,max 1.0 1.20 1.00
Silicon,max 1.0 1.10 1.50
Phosphorus,max0.040.0300.04
Sulfur,max0.040.0300.04
Chromium24.5–26.524.0-26.722.5–25.5
Nickel 4.7–6.0 5.6-6.78.0–11.0
Molybdenum 1.7–2.3 2.9-3.8 3.0–4.5
Copper 2.7–3.3 1.
<.
Nitrogen0.10–0.250.22-0.330.10–0.30
Grade3A4A5A B6A B7A C
深圳茶溪谷
Type25Cr-5Ni-Mo-N22Cr-5Ni-Mo-N25Cr-7Ni-Mo-N25Cr-7Ni-Mo-N27Cr-7Ni-Mo-Cu-N UNS J93371J92205J93404J93380
ACI CD6MN CD3MN CE3MN CD3MWCuN
Composition:
Carbon,max0.060.030.030.030.030 Mangane,max 1.00 1.50 1.50 1.00 1.00-3.00 Silicon,max 1.00 1.00 1.00 1.00 1.00 Phosphorus,max0.0400.040.040.0300.030
组词卜
鉴证咨询服务Sulfur,max0.0400.0200.040.0250.020
Chromium24.0–27.021.0–23.524.0–26.024.0–26.026.0–28.0
Nickel 4.0–6.0 4.5–6.5 6.0–8.0 6.5–8.5 6.0–8.0 Molybdenum 1.75–2.5 2.5–3.5 4.0–5.0 3.0–4.0 2.0–3. 1.0.5–1.0 1.00,.0.5–1.0 3.0–4.0
Nitrogen0.15–0.250.10–0.300.10–0.300.20–0.300.30–0.0.0010-0.0.0010-0.0100
0.005–0.030
A 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$45.
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8.3When post weld/heat treatment is believed necessary for adequate corrosion resistance or impact resistance,Sup-plementary Requirement S33Post Weld/Heat Treatment shall be included in the purcha order.
9.Product Marking
9.1Castings shall be marked for material identification with the specification designation and grade.In addition,the manu-facturer’s 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 on individual castings shall be agreed upon between the manufacturer and the purchar.Marking shall be in such position as not to injure the ufulness of the casting.10.Keywords
10.1austenite;duplex stainless steel;ferrite;stainless steel;steel castings
SUPPLEMENTARY REQUIREMENTS
The following supplementary requirements shall not apply unless specified in the purcha order.A list of standardized supplementary requirements for u at the option of the purchar is included in Specification A781/A781M .Tho that are ordinarily considered suitable for u with this specifica-tion are listed below by title only.Others enumerated in Specification A781/A781M may be ud with this specification upon agreement between the manufacturer and purchar.
S2.Radiographic Examination S3.Liquid Penetrant Examination S5.Examination of Weld Preparation S6.Certification
S7.Prior Approval of Major Weld Repairs S9.Charpy Impact Test S10.Hardness Test S12.Test Report
S13.Unspecified Elements
S31.Estimating Ferrite Content
S31.1Ferrite contents shall be determined by point count (Practice E562),by other quantitative metallographic methods such as image analysis (Practice E1245),by measurement of magnetic respon,or by other methods upon agreement
between the manufacturer and the purchar.Frequency of testing and location of tests shall be by agreement between the manufacturer and the purchar.S32.Tensile Requirements
S32.1One tensile test shall be made from each heat and shall conform to the tensile requirements specified in Table S32.1.Test bars shall be poured in special blocks from the same heat as the castings reprented.(See S32.4.)
S32.2The bar from which the test specimen is removed shall be heat-treated in production furnaces to the same procedure as the castings it reprents.
S32.3Test specimens may be cut from heat-treated castings,at the producer’s option,instead of from test bars.
S32.4Test coupons may be cast integrally or as parate cast blocks in accordance with Figs.1and 2of Specification A781/A781M .Tension coupons shall be machined to the form and dimensions of Fig.4of Test Methods and Definitions A370,except when investment castings are ordered.When investment castings are ordered,the manufacturer may prepare
TABLE S32.1Tensile Requirements
Grade Type
2A
24Cr-10Ni-Mo-N 3A
25Cr-5Ni-Mo-N 4A
22Cr-5Ni-Mo-N Tensile strength,ksi [MPa],min 95[655]95[655]90[620]Yield strength (0.2%offt),ksi [MPa],min
65[450]65[450]60[415]Elongation in 2in.[50mm],%,min A
25
25
25
Grade Type
5A
25Cr-7Ni-Mo-N 6A
25Cr-7Ni-Mo-N 7A
27Cr-7Ni-Mo-Cu-N
1B
25Cr-5Ni-Mo-Cu-N 1C
25Cr-6Ni-Mo-Cu-N Tensile strength,ksi [MPa],min 100[690]100[690]100,000[690]100[690]100[690]Yield strength (0.2%offt),ksi [MPa],min
75[515]65[450]75,000[515]70[485]65[450]Elongation in 2in.[50mm],%,min A
18
25
20
16
25
A
When ICI test bars are ud in tensile testing as provided for in this specification,the gage length to reduced ction diameter ratio shall be
4:1.
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test specimens in accordance with S3.2of Specification A732/ A732M.Testing shall be in accordance with Test Methods and Definitions A370.
S32.5If any specimen shows defective machining or devel-opsflaws,it may be discarded and another substituted from the same heat.
S32.6To determine conformance with the tension test requirements,an obrved value or calculated value shall be rounded off in accordance with Practice E29to the nearest500 psi[5MPa]for yield and tensile strength and to the nearest1% for elongation and reduction of area.
S33.Post Weld/Heat Treatment
S33.1Castings shall be heat-treated after major weld re-pairs,but heat treatment after minor weld repairs is not required except upon agreement between the manufacturer and the purchar.
S33.2Weld repairs shall be considered major in the ca of a casting that has leaked on hydrostatic t
esting or when the depth of the cavity after preparation for repair exceeds20%of the actual wall thickness,or1in.[25mm],whichever is smaller,or when the extent of the cavity exceeds approxi-mately10in.2[65cm2].All other weld repairs shall be considered minor.
S33.3Post weld heat treatment shall be in accordance with Table1.
S34.Prior Approval of Weld Material
S34.1The purchar must give approval of all weldfiller materials to be ud prior to any weld repairs.聪明的小空空
S35.Heat Treatment of Test Material
S35.1Test material for each heat shall be heat-treated with the castings it reprents.
SUMMARY OF CHANGES
Committee A01has identified the location of lected changes to this standard since the last issue (A890/A890M–10)that may impact the u of this standard.(Approved March1,2012.)
(1)Added notes on purchar responsibility to determine
宝贝造句suitability of the material characteristics and maximum rvice
temperature.
(2)Added Grade7A.
Committee A01has identified the location of lected changes to this standard since the last issue (A890/A890M–99(2007))that may impact the u of this standard.(Approved April1,2010.)
(1)Deleted Grade1A(CD4MCu)
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