1、Designation: A 289/A 289M 97 (Reapproved 2008)Standard Specification forAlloy Steel Forgings for Nonmagnetic Retaining Rings forGenerators1This standard is issued under the fixed designation A 289/A 289M; the number immediately following the designation indicates the yearof original adoption or, in
2、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 nonmagnetic alloy steel retain-ing ring forgings for gene
3、rators.1.2 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 in non-conforman
4、cewith the standard.1.3 Unless the order specifies the applicable “M” specifica-tion designation, the material shall be furnished to the inch-pound units.2. Referenced Documents2.1 ASTM Standards:2A 342/A 342M Test Methods for Permeability of FeeblyMagnetic MaterialsA 370 Test Methods and Definition
5、s for Mechanical Testingof Steel ProductsA 531/A 531M Practice for Ultrasonic Examination ofTurbine-Generator Steel Retaining RingsA 788/A 788M Specification for Steel Forgings, GeneralRequirementsE45 Test Methods for Determining the Inclusion Contentof SteelE112 Test Methods for Determining Average
6、 Grain SizeE 165 Test Method for Liquid Penetrant Examination3. Ordering Information and General Requirements3.1 Material supplied to this specification shall conform tothe requirements of Specification A 788/A 788M, which out-lines ordering information, manufacturing requirements, test-ing methods
7、and retesting procedures, marking, certification,product analysis variation, and additional supplementary re-quirements.3.2 If the requirements of this specification are in conflictwith the requirements of Specification A 788/A 788M, therequirements of this specification shall prevail.3.3 Supplement
8、ary requirements of an optional nature areprovided. They shall apply only when specified by the pur-chaser.4. Manufacture4.1 The steel shall be made by the electro-slag-remelt (ESR)process. The electrodes shall be made by either the basicelectric furnace or ladle refining processes.4.2 Sufficient di
9、scard shall be taken from each ingot tosecure freedom from piping and undue segregation.4.3 Forged rings shall be solution treated following hotworking and prior to the cold expansion procedure.4.4 Rings shall be rough machined prior to cold expansionor final heat treatment.4.5 Rings shall be expand
10、ed by an appropriate method suchas segmented dies, tapered plug, etc. in the temperature rangeof 60 to 390F 15 to 200C in order to develop the requiredtensile properties.4.6 After cold expansion, the rings shall be heated tobetween 575 and 750F 300 to 400C at a rate not to exceed75F 40C/h, held at t
11、his temperature for 6 to 12 h, and thenslow cooled to ambient temperature.5. Chemical Requirements5.1 Heat AnalysisThe heat analysis obtained from sam-pling in accordance with Specification A 788/A 788M shallcomply with Table 1 of this specification.1This specification is under the jurisdiction of A
12、STM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved March 1, 2008. Published April 2008. Originallyapproved in 1946. Last previous edition approved in 2003 as A 289/A 289M 97(2003)
13、.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 standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box
14、 C700, West Conshohocken, PA 19428-2959, United States.5.2 Product AnalysisWhen a product analysis is per-formed at the request of the purchaser, the provisions of Table1 of Specification A 788/A 788M shall apply. The analysisshall be made from a forging representing each heat.NOTE 1The material sho
15、wn in Table 1 of A 289/A 289M wasformerly known as Class C.6. Mechanical Properties6.1 The rings shall conform to the tensile properties for theordered grade listed in Table 2. The largest obtainable tensiontest specimen as specified in Test Methods and DefinitionsA 370 shall be used.6.2 Unless Supp
16、lementary Requirement S2 is invoked, ten-sion tests shall be performed in the temperature range of 68 to80F 20 to 27C. The yield strength at 0.2 % offset shall notexceed the tensile strength.6.3 Rings shall conform to the Charpy V-notch requirementsof Table 2 corresponding to the ordered strength gr
17、ade whentested in the temperature range specified in 6.2.7. Electrical Properties7.1 The permeability of the forgings at a magnetizing forceof 100 oersteds shall not exceed 1.5. Test bars and testing shallbe in accordance with Test Methods A 342/A 342M.8. Number and Location of Tests8.1 The number o
18、f tension tests shall be as ordered by thepurchaser, but in no case shall there be less than one tensiontest for each ring.8.2 Tangentially oriented tension test samples shall belocated at the midwall location of an integral prolongationforged at one or both ends of the ring, as shown in Fig. 1. The
19、specimens shall be removed after cold working and subsequentstress relief.8.3 A minimum of one set of three tangentially orientedCharpy V-notch specimens shall be removed from the insidediameter location of the test prolongation as shown in Fig. 1.The notch shall be aligned parallel to the longitudi
20、nal axis ofthe ring. The purchaser may specify the side of the specimen tobe notched and that the distance of the root of the notch fromthe inside diameter of the ring be different from that shown inFig. 1.9. Metallographic Tests9.1 The inclusion content of the material shall be deter-mined in accor
21、dance with Method A of Test Methods E45utilizing a sample taken from the tension test location. Themaximum allowable rating for any inclusion type shall be 3.0.9.2 Grain size shall be determined according to Test Meth-ods E112from a sample taken from the midwall tension testlocation in the test prol
22、ongation. The results shall be reportedfor information.9.3 A photomicrograph at a magnification of 100x shall betaken of the etched microstructure from the grain size sampleand submitted with the certification data required by thespecification and Specification A 788/A 788M.10. Nondestructive Tests1
23、0.1 The ring shall be free from cracks, seams, laps,shrinkage, and other injurious defects.10.2 An ultrasonic examination of the machined ring shallbe made by the manufacturer in accordance with PracticeA 531/A 531M. The acceptance criteria shall be by agreementbetween manufacturer and purchaser.10.
24、3 A liquid penetrant examination of the finished ringshall be made by the manufacturer in accordance with TestMethod E 165. The acceptance criteria shall be agreed tobetween the manufacturer and the purchaser.TABLE 1 Chemical RequirementsComposition, weight %Carbon 0.10 maxManganese 17.520.0Phosphor
25、us 0.060 maxSulfur 0.015 maxSilicon 0.80 maxNickel 2.00 maxChromium 17.520.0Nitrogen 0.45-0.80Titanium 0.10 maxAluminum 0.04 maxVanadium 0.25 maxTABLE 2 Room Temperature Mechanical Property RequirementsGradeTensileStrength,min, ksiMPa0.2 % OffsetYieldStrength,min, psiMPaElongationin 2 in. or50 mm,mi
26、n, %Reductionof Area,min, %CharpyV-NotchEnergy,min. ft/lb J1 145 1000 135 930 28 60 70 952 155 1070 145 1000 25 55 65 883 165 1140 160 1105 20 50 60 814 170 1170 165 1140 19 48 58 795 175 1205 170 1170 17 45 55 756 185 1275 180 1240 14 40 50 687 195 1345 190 1310 12 35 40 548 200 1380 195 1345 10 30
27、 35 47 FIG. 1 Outside Diameter and Inside Diameter as Required byDrawingA 289/A 289M 97 (2008)211. Keywords11.1 alloy steel; cold worked; generator retaining rings;nonmagnetic; steel forgingsSUPPLEMENTARY REQUIREMENTSOne or more of the following supplementary requirements shall apply only when speci
28、fied by thepurchaser in the inquiry and order. Details of these supplementary requirements shall be agreed uponbetween the manufacturer and the purchaser.S1. Charpy V-Notch Impact TestsS1.1 Requirements for energy absorption at room tempera-ture as determined on Charpy impact specimens shall bespeci
29、fied by the purchaser.S2. Alternative Elevated Temperature TensileRequirementsS2.1 Tensile tests shall be performed at 200 to 220F 95 to105C and shall meet the requirements of Table S1.NOTE S1The Charpy V-Notch test temperature requirements are notaltered by this requirement.ASTM International takes
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31、onsibility.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 addresse
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33、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 ASTM at the aboveaddress or at 610-832-9585 (phon
34、e), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE S1 Alternative Elevated Temperature TensileRequirements (200-220F)GradeTensile Strength,min, ksi MPa0.2 % OffsetYield Strength,min, psi MPaElongation,2 in. 50mm min,%Reductionof area,min,%1 120 830 110 760 25 602 125 860 120 830 23 583 135 930 135 930 19 564 140 965 140 965 17 555 145 1000 145 1000 15 546 155 1070 155 1070 13 527 165 1140 165 1140 10 518 170 1170 170 1170 10 50A 289/A 289M 97 (2008)3
