ASTM A968 A968M-1996(2009) Standard Specification for Chromium Chromium-Nickel and Silicon Alloy Steel Bars and Shapes for Corrosion and Heat-Resisting Service《和耐热耐蚀设备用铬 铬镍及硅合金钢棒材及.pdf

1、Designation: A 968/A 968M 96 (Reapproved 2009)Standard Specification forChromium, Chromium-Nickel, and Silicon Alloy Steel Barsand Shapes for Corrosion and Heat-Resisting Service1This standard is issued under the fixed designationA 968/A 968M; the number immediately following the designation indicat

2、es 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-finis

3、hed 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 thei

4、r particular 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

5、the 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 resul

6、t in 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. Ref

7、erenced Documents2.1 ASTM Standards:2A 484/A 484M Specification for General Requirements forStainless Steel Bars, Billets, and ForgingsA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsE 527 Practice for Numbering Metals and Alloys in theUnified Numbering System (U

8、NS)2.2 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, th

9、e following: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.

10、5 Heat-treated condition (see Section 5);3.1.6 Finish (see Manufacture section of SpecificationA 484/A 484M);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 Delive

11、rysection of Specification A 484/A 484M);3.1.10 Marking requirements (see Marking section ofSpecification A 484/A 484M);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-Rolle

12、d and Wrought Stainless Steel.Current edition approved May 1, 2009. Published June 2009. Originallyapproved in 1996. Last previous edition approved in 2001 as A 968/A 968M - 96(2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.

13、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.TABLE 1 Chemical Composition, %AGrade . . .UNS DesignationBS70003C 0.02Mn 2.0P 0.025S

14、 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 E 527 and Recommended Practice SAE J 1086.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.11 Surface prepara

15、tion of shapes (see Manufacture sec-tion of Specification A 484/A 484M); and3.1.12 The intended use of the material, if the purchaserconsiders this useful information.NOTE 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

16、Specification A XXX A XXX; annealed; centerless ground; plus anyoptional supplementary requirements; such as, for example, specialmarking instructions.4. General Requirements4.1 In addition to the requirements of this specification, allrequirements of the current editions of Specification A 484/A 48

17、4Mshall apply. Failure to comply with the general require-ments of Specification A 484/A 484M constitutes nonconfor-mance with this specification.5. Heat Treatment5.1 UNS S70003 shall be furnished in the solution annealedcondition with subsequent light drawing and straighteningpermitted.6. Chemical

18、Composition6.1 Chemical composition shall be reported to the pur-chaser, or his representative, and shall conform to the require-ments specified in Table 1.6.2 When a product analysis is performed or requested bythe purchaser, the tolerance limits as described in SpecificationA 484/A 484M apply.6.3

19、Methods and practices relating to chemical analysisrequired by this specification shall be in accordance with TestMethods, Practices, and Terminology A 751.7. Mechanical Properties7.1 The material shall conform to the mechanical propertyrequirements specified in Table 2 for the grade ordered.At leas

20、tone 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 DefinitionsA 370.7.3 Hardness measurements, when required, s

21、hall 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 specification, together with a report of theresults required

22、 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 withSpecification A 484/A 484M.ASTM International takes no pos

23、ition 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 their own responsibil

24、ity.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 or for additional standardsand should be addressed to AS

25、TM 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 known to the ASTM Committee on Standards, at the address

26、 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 ASTM at the aboveaddress or at 610-832-9585 (phone), 610

27、-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).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 E 527 and Recommended Practice SAE J 1086.BEither Brinell or Rockwell B is permissible.A 968/A 968M 96 (2009)2