1、Designation:A 831/A831M 95(Reapproved 2000)Standard Specification forAustenitic and Martensitic Stainless Steel Bars,Billets,andForgings for Liquid Metal Cooled Reactor CoreComponents1This standard is issued under the fixed designation A 831/A831M;the number immediately following the designation ind
2、icates 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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers hot-and cold-finishe
3、d austen-itic and martensitic stainless steel bars,billets,and forgingsintended for use in manufacturing core components used athigh temperatures in liquid metal cooled nuclear reactors.1.2 The bars,billets,and forgings are intended for machin-ing,welding,hot-and cold-forming operations.1.3 The valu
4、es stated in either inch-pound units or SI unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem are not exact equivalents;therefore,each system shallbe used independently of the other.Combining values from thetwo systems may
5、 result in nonconformance with the specifi-cation.1.4 This specification and the applicable material specifica-tions are expressed in both inch-pound and SI units.However,unless the order specifies the applicable“M”specificationdesignation(SI units),the material shall be furnished ininch-pound units
6、.2.Referenced Documents2.1 ASTM Standards:A 370 Test Methods and Definitions for Mechanical Testingof Steel Products2A 388/A388M Practice for Ultrasonic Examination ofHeavy Steel Forgings3A 484/A484M Specification for General Requirements forStainless Steel Bars,Billets,and Forgings3A 751 Test Metho
7、ds,Practices,and Terminology forChemical Analysis of Steel Products2E 3 Methods of Preparation of Metallographic Specimens4E 45 Practice for Determining the Inclusion Content ofSteel4E 112 Test Methods for Determining Average Grain Size4E 407 Test Methods for Microetching Metals and Alloys42.2ANSI S
8、tandard:B 46.1 Surface Texture52.3ASNDT Standard:SNT-TC-1A Recommended Practice for NondestructiveTesting Personnel Qualifications and Certification62.4ASME Standard:NQA-1 Quality Assurance Program Requirements forNuclear Facilities73.Ordering Information3.1 It is the responsibility of the purchaser
9、 to specify allrequirements that are necessary for material ordered under thisspecification.Such requirements may include but are notlimited to the following:3.1.1 Quantity(weight or number of pieces).3.1.2 Condition(cold-worked,annealed,or tempered).3.1.3 Finish.3.1.4 Applicable dimensions,includin
10、g size,thickness,width,and length(if forgings,include prints or sketches).3.1.5 Form(bars,billets,etc.).3.1.6 Grade designation.3.1.7 ASTM designation and year of issue.3.1.8 Marking requirements.3.1.9 Other applicable documents(2.4).3.1.10 Melting process(4.1).3.1.11 Approval of procedures for conv
11、ersion of ingots(4.2).3.1.12 Cold working requirements for austenitic grades(4.4.3).3.1.13 Identification requirements(4.6).3.1.14 Chemistry requirements(5.1).3.1.15 Product analysis tolerances(5.3).3.1.16 Grain size limits for bar,billets,and forgings requir-ing rework(6.1).1This specification is u
12、nder the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel,and Related Alloys and is the direct responsibility of SubcommitteeA01.17 on Flat Stainless Steel Products.Current edition approved Jan.15,1995.Published March 1995.Originallypublished as A 831 84.Last previous edition A 831 94.2An
13、nual Book of ASTM Standards,Vol 01.03.3Annual Book of ASTM Standards,Vol 01.05.4Annual Book of ASTM Standards,Vol 03.01.5Available from American National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10036.6Available from American Society for Nondestructive Testing,P.O.Box 5642,3200 Rivers
14、ide Dr.,Columbus,OH 43228.7Available from American Society of Mechanical Engineers,345 E.47th St.,New York,NY 10017.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.3.1.17 Alternate inclusion limits(6.2).3.1.18 Surface roughness limits(4.3
15、.2).3.1.19 Surface marring limits(4.3.3).3.1.20 Ultrasonic test requirements(8.1).3.1.21 Sampling levels(10.1).3.1.22 Packaging requirements(12.1).NOTE1A typical ordering description is as follows:5000-lb 2000-kg stainless steel,annealed and centerless ground,round bar 112in.38mm in diameter,10 to 1
16、2 ft.3 to 4 m Type 316,ASTM SpecificationA 831 xx.4.Manufacture4.1 MeltingUnless an alternative melting process hasbeen specified in Section 9,the process for austenitic gradesshall consist of a vacuum induction melt followed by aconsumable electrode vacuum-arc remelt.Additions of rareearths during melting are prohibited unless approved by thepurchaser.The melting process for other grades shall bespecified in the order.4.2 Ingot ProcessingAprocedure for conversion of ingotsshall be approved by t
