ASTM A389 A389M-2008 Standard Specification for Steel Castings Alloy Specially Heat-Treated for Pressure-Containing Parts Suitable for High-Temperature Service.pdf

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1、Designation: A 389/A 389M 08Standard Specification forSteel Castings, Alloy, Specially Heat-Treated, for Pressure-Containing Parts, Suitable for High-Temperature Service1This standard is issued under the fixed designation A 389/A 389M; the number immediately following the designation indicates the y

2、earof 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.This standard has been approved for use by agencies of the Depart

3、ment of Defense.1. Scope*1.1 This specification covers alloy steel castings, whichhave been subjected to special heat treatment, for valves,flanges, fittings, and other pressure-containing parts (Note 1)intended primarily for high-temperature service.1.2 The high-temperature properties of the materi

4、als cov-ered in this specification are dependent upon special heattreatment that is required. Although the high-temperatureproperties are not specified, they are implied by control ofchemistry, heat treatment, and room-temperature properties.1.3 Two grades of ferritic alloy steel are covered (Note 2

5、).Selection will depend on the design and service conditions,mechanical properties, and high-temperature characteristics.NOTE 1Carbon steel castings for pressure-containing parts are cov-ered by Specification A 216/A 216M. Alloy steel castings are covered bySpecification A 217/A 217M.NOTE 2The grade

6、s covered by this specification represent materialsthat are generally suitable for assembly with other castings or wroughtsteel parts by fusion welding. It is not intended to imply that these gradespossess equal degrees of weldability; therefore, it is the responsibility ofthe purchaser to establish

7、 for himself a suitable welding technique. Sincethese grades possess varying degrees of suitability for resistance tooxidation and for high-temperature service, it is also the responsibility ofthe purchaser to determine which grade shall be furnished, due consider-ation being given to the requiremen

8、ts of the applicable construction codes.1.4 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 sy

9、stems may result in non-conformancewith the standard.2. Referenced Documents2.1 ASTM Standards:2A 216/A 216M Specification for Steel Castings, Carbon,Suitable for Fusion Welding, for High-Temperature Ser-viceA 217/A 217M Specification for Steel Castings, MartensiticStainless and Alloy, for Pressure-

10、Containing Parts, Suit-able for High-Temperature ServiceA 488/A 488M Practice for Steel Castings, Welding, Quali-fications of Procedures and PersonnelA 703/A 703M Specification for Steel Castings, GeneralRequirements, for Pressure-Containing PartsA 985/A 985M Specification for Steel Investment Casti

11、ngsGeneral Requirements, for Pressure-Containing Parts2.2 Manufacturers Standardization Society of the Valveand Fittings Industry Standard:SP-55 Quality Standard for Steel Castings for Valves,Flanges, and Fittings and other Components (VisualMethod)33. General Conditions for Delivery3.1 Except for s

12、teel investment castings, material furnishedto this specification shall conform to the requirements ofSpecification A 703/A 703M, including any supplementaryrequirements that are indicated in the purchase order. Failure tocomply with the general requirements of A 703/A 703M con-stitutes nonconforman

13、ce with the specification. In case ofconflict between the requirements of this specification andA 703/A 703M, this specification shall prevail.3.2 Steel investment castings furnished to this specificationshall conform to the requirements of Specification A 985/A 985M, including any supplementary req

14、uirements that areindicated in the purchase order. Failure to comply with the1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings .Current edition approved Oct. 1, 2008. Publ

15、ished November 2008. Originallyapproved in 1955. Last previous edition approved in 2007 as A 389 03 (2007).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the stand

16、ards Document Summary page onthe ASTM website.3Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Ba

17、rr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.general requirements of Specification A 985/A 985M consti-tutes nonconformance with this specification. In case of con-flict between the requirements of this specification and Speci-fication A 985/A 985M, Specification A 9

18、85/A 985M shallprevail.4. Ordering Information4.1 The inquiry and order should include or indicate thefollowing:4.1.1 A description of the casting by pattern number ordrawing (dimensional tolerances shall be included on thecasting drawing),4.1.2 Grade of steel,4.1.3 Options in the specification, and

19、4.1.4 The supplementary requirements desired including thestandards of acceptance.5. Heat Treatment5.1 All castings shall receive a heat treatment proper to theirdesign and chemical composition. Heat treatment shall beperformed before machining except in instances when reheattreating is necessary. A

20、ll castings shall have been allowed tocool, after pouring, to a temperature below the critical rangebefore heat treatment.5.2 At the option of the manufacturer the castings may begiven any preliminary heat treatment that will aid in theirprocessing.5.3 All castings shall receive a final heat treatme

21、nt consist-ing of normalizing and tempering at the temperature prescribedfor each grade in Table 1.5.4 Furnace temperatures for heat treating shall be effec-tively controlled by use of pyrometers.6. Chemical Composition6.1 The steel shall conform to the requirements as tochemical composition prescri

22、bed in Table 2.7. Tensile Requirements Tensile Requirements7.1 Steel used for the castings shall conform to the require-ments as to tensile properties prescribed in Table 3.8. Quality8.1 The surface of the casting shall be examined visuallyand shall be free of adhering sand, scale, cracks, and hot t

23、ears.Other surface discontinuities shall meet the visual acceptancestandards specified in the order. Visual Method SP-55 or othervisual standards may be used to define acceptable surfacediscontinuities and finish. Unacceptable visual surface discon-tinuities shall be removed and their removal verifi

24、ed by visualexamination of the resultant cavities. When methods involvinghigh temperature are used in the removal of discontinuities,castings shall be preheated to at least the minimum tempera-tures in Table 4.8.2 The castings shall not be peened, plugged, or impreg-nated to stop leaks.9. Repair by

25、Welding9.1 Repair shall be made by using a welding procedure andoperators qualified in accordance with PracticeA 488/A 488M.The composition of the deposit weld material shall be similarto that of the casting, or of other composition as may be agreedupon between the manufacturer and the purchaser. Th

26、e castingsafter complement of weld repairing shall be retempered exceptthat local tempering of the weld repairs will be permitted if, inthe manufacturers opinion, complete furnace-heat treatmentwould be damaging to the finished surfaces of a machinedcasting. Heat treatments after weld repair other t

27、han temperingshall be performed only when agreed upon between themanufacturer and the purchaser.9.2 Weld repairs shall be considered major in the case of acasting that had leaked on hydrostatic test, or when the depthof cavity prepared for welding exceeds 20 % of the actual wallthickness or 1 in. 25

28、.4 mm, whichever is smaller, or when theextent of the cavity exceeds approximately 10 in.264.5 cm2.When requested by the purchasers inspector, such weld repairsshall be subject to his approval. He shall also have the right torequire complete reheat treatment of the repaired casting inaccordance with

29、 5.3. When mutually agreed upon between theTABLE 1 Heat Treating TemperaturesGrade NormalizingTemperature,FCTemperingTemperature,FCHoldingTime, hC23 18501950 12501350 1A10101065 675730C24 18501950 12501350 1210101065 675730APer inch or less of thickness.TABLE 2 Chemical RequirementsGrade (UNS No.) C

30、omposition, %C23 (J12080) C24 (J12092)Carbon, max 0.20 0.20Manganese 0.300.80 0.300.80Phosphorus, max 0.04 0.04Sulfur, max 0.045 0.045Silicon, max 0.60 0.60Chromium 1.001.50 0.801.25Molybdenum 0.450.65 0.901.20Vanadium 0.150.25 0.150.25TABLE 3 Tensile RequirementsGrade C23 C24Tensile strength, min,

31、ksi MPa 70 80483 552Yield strength,Amin, ksi MPa 40 50276 345Elongation in 2 in. 50 mm, min, %B18.0 15.0Reduction of area, min, % 35.0 35.0ADetermine by either 0.2 % offset or 0.5 % extension-under-load method.BWhen ICI test bars are used in tensile testing as provided for in SpecificationA 703/A 70

32、3M, the gage length to reduced section diameter ratio shall be 4 to 1.TABLE 4 Minimum Preheat TemperatureGrade Minimum Preheat Temperature, FCC23 300 150C24 300 150A 389/A 389M 082purchaser and the manufacturer, major repair weld may beexamined at the manufacturers expense by magnetic particleexamin

33、ation or radiographing, or both, to check the adequacyof the repair.10. Keywords10.1 steel castings; alloy steel; pressure containing parts;high temperature applicationsSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purchase order. Alist of

34、 standardized supplementary requirements for use at the option of the purchaser is included inSpecification A 703/A 703M. Those which are ordinarily considered suitable for use with thisspecification are given below. Others enumerated in Specification A 703/A 703M may be used withthis specification

35、upon agreement between the manufacturer and purchaser.S1. Residual Elements Chemical AnalysisS2. Destruction TestsS3. Bend TestsS4. Magnetic Particle InspectionS5. Radiographic InspectionS10. Examination of Weld PreparationSUMMARY OF CHANGESCommittee A01 has identified the location of selected chang

36、es to this standard since the last issue(A 389/A 389M 03 (2007) that may impact the use of this standard. (Approved Oct. 1, 2008.)(1) Added new reference to subsection 2.1.(2) Editorial changes to subsection 3.1.(3) Added new paragraph to Section 3.ASTM International takes no position respecting the

37、 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 responsibility.This standard is

38、 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 ASTM International Hea

39、dquarters. 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 shown below.This st

40、andard 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), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).A 389/A 389M 083