1、Designation: A968/A968M 96 (Reapproved 2014)Standard Specification forChromium, Chromium-Nickel, and Silicon Alloy Steel Barsand Shapes for Corrosion and Heat-Resisting Service1This standard is issued under the fixed designation A968/A968M; the number immediately following the designation indicates
2、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. Scope1.1 This specification covers hot- and cold-finished
3、 alloysteel bars having a chromium content equal to or less than11.0 % including rounds, squares, hexagons, and hot-rolled orextruded shapes for use in corrosion and heat-resisting service.1.2 Some steels covered by this specification, especially thehigh silicon-containing steels, because of their p
4、articular alloycontent and specialized properties, may require special care intheir fabrication and welding. Specific procedures are offundamental importance, and it is presupposed that all param-eters will be in accordance with approved test methods capableof producing the desired properties in the
5、 finished fabrication.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 systems may result i
6、n non-conformancewith the standard.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.2. Refere
7、nced Documents2.1 ASTM Standards:2A484/A484M Specification for General Requirements forStainless Steel Bars, Billets, and ForgingsA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)2.
8、2 SAE Standard:SAE J 1086 Recommended Practice for Numbering Metalsand Alloys33. Ordering Information3.1 It is the responsibility of the purchaser to specify allrequirements that are necessary for material ordered under thisspecification. Such requirements may include, but are notlimited to, the fol
9、lowing:3.1.1 Quantity (weight or number of pieces);3.1.2 Dimensions, including diameter or thickness (andwidth), shape or form, applicable prints or sketches, length, andso forth;3.1.3 Type or UNS designation (see Table 1);3.1.4 ASTM designation and edition year if other than latestedition;3.1.5 Hea
10、t-treated condition (see Section 5);3.1.6 Finish (see Manufacture section of SpecificationA484/A484M);3.1.7 Supplementary requirements invoked for special ser-vices;3.1.8 Whether bars are to be rolled as bars or cut from stripor plate;3.1.9 Preparation for delivery (see Preparation for Deliverysecti
11、on of Specification A484/A484M);3.1.10 Marking requirements (see Marking section ofSpecification A484/A484M);3.1.11 Surface preparation of shapes (see Manufacture sec-tion of Specification A484/A484M); and3.1.12 The intended use of the material, if the purchaserconsiders this useful information.NOTE
12、 1A typical ordering description is as follows: 5000 lb 2000kg; 1.000-in. 25-mm round bar by 10 to 12 ft 3 to 4 m; UNS S70003;to Specification A XXX A XXX; annealed; centerless ground; plus anyoptional supplementary requirements; such as, for example, specialmarking instructions.4. General Requireme
13、nts4.1 In addition to the requirements of this specification, allrequirements of the current editions of Specification A484/1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.17 on Flat-R
14、olled and Wrought Stainless Steel.Current edition approved March 1, 2014. Published April 2014. Originallyapproved in 1996. Last previous edition approved in 2009 as A968/A968M- 96(2009). DOI: 10.1520/A0968_A0968M-96R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact
15、ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Society of Automotive Engineers, 400 Commonwealth Drive,Warrendale, PA 15096.Copyright ASTM International, 100 Barr Harbor Dr
16、ive, PO Box C700, West Conshohocken, PA 19428-2959. United States1A484Mshall apply. Failure to comply with the general requirements of Specifi-cation A484/A484M constitutes nonconformance with this specification.5. Heat Treatment5.1 UNS S70003 shall be furnished in the solution annealedcondition wit
17、h subsequent light drawing and straighteningpermitted.6. Chemical Composition6.1 Chemical composition shall be reported to thepurchaser, or his representative, and shall conform to therequirements specified in Table 1.6.2 When a product analysis is performed or requested bythe purchaser, the toleran
18、ce limits as described in SpecificationA484/A484M apply.6.3 Methods and practices relating to chemical analysisrequired by this specification shall be in accordance with TestMethods, Practices, and Terminology A751.7. Mechanical Properties7.1 The material shall conform to the mechanical propertyrequ
19、irements specified in Table 2 for the grade ordered.At leastone room-temperature test shall be performed by the manufac-turer on a sample from at least one bar or shape from each lotof material.7.2 The yield strength shall be determined by the offset(0.2 %) method as prescribed in Test Methods and D
20、efinitionsA370.7.3 Hardness measurements, when required, shall be madeat a location midway between the surface and the center of thecross section.8. Certification8.1 The material manufacturers certificate of compliancecertifying that the material was manufactured and tested inaccordance with this sp
21、ecification, together with a report of theresults required by this specification and the purchase order,shall be furnished at the time of shipment. The certificationshall be positively relatable to the lot of material represented.9. Product Marking9.1 Marking requirements shall be in accordance with
22、Specification A484/A484M.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 infring
23、ement 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 reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard
24、or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views
25、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 Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting
26、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 photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Chemical Composition, %AGrade . . .
27、UNS DesignationBS70003C 0.02Mn 2.0P 0.025S 0.010Si 6.5 to 8.0Ni 22.0 to 25.0Cr 8.0 to 11.0Mo 0.50AMaximum, unless range or minimum is indicated.BRefer to Practice E527 and Recommended Practice SAE J 1086.TABLE 2 Mechanical Test RequirementsGrade UNS DesignationATensile Strength,min, ksi (MPa)0.2 % Yield Strength,min, ksi (MPa)Elongation in 2 in. or 50mm, min, %Hardness, maxBBrinell Rockwell B. . . S70003 78 (540) 35 (240) 40 217 95ARefer to Practice E527 and Recommended Practice SAE J 1086.BEither Brinell or Rockwell B is permissible.A968/A968M 96 (2014)2
