ASTM_A_288_-_91_2013.pdf

Designation:A28891(Reapproved 2013)Standard Specification forCarbon and Alloy Steel Forgings for Magnetic RetainingRings for Turbine Generators1This standard is issued under the fixed designation A288;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers quenched and tempered carbonand alloy steel forgings for magnetic retaining rings for turbinegenerators.1.2 Supplementary requirements of an optional nature areprovided.These shall apply only when specified by thepurchaser.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:2A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA531/A531M Practice for Ultrasonic Examination ofTurbine-Generator Steel Retaining RingsA788/A788M Specification for Steel Forgings,General Re-quirements3.Ordering Information3.1 In addition to the ordering information required bySpecification A788/A788M,the purchaser shall include withthe inquiry and order a detailed drawing,sketch,or writtendescription of the forging,including the number and locationof mechanical test specimens.4.Manufacture4.1 The melting processes of Specification A788/A788Mshall be applicable except that the basic electric furnaceprocess shall be used if separate refining or remelting is notemployed.4.2 Vacuum DegassingFor Class 3 machined forgingsover 212in.(63.5 mm)wall thickness,and Classes 4 to 8,themolten steel shall be vacuum treated immediately prior to orduring the operation of pouring the ingot in order to removeobjectionable gases,especially hydrogen.4.3 DiscardSufficient discard shall be made from eachingot to secure freedom from piping and undue segregation.4.4 Heat Treatment:4.4.1 Heat Treatment for Mechanical PropertiesHeattreatment for properties shall be by quenching and tempering.4.4.2 Tempering TemperatureThe final tempering tem-perature shall be not less than 1100F(595C).4.5 Machining:4.5.1 Preliminary MachiningForgings shall be machinedall over prior to quenching and tempering for mechanicalproperties.4.5.2 MachinetoPurchasersRequirementsforShipmentIf required,forgings shall be machined to thedimensions shown on the purchasers drawing prior to ship-ment.5.Chemical Composition5.1 The steel shall conform to the chemical compositionprescribed in Table 1.5.2 Heat AnalysisThe heat analysis obtained from sam-pling in accordance with Specification A788/A788M shallcomply with Table 1.5.3 Product AnalysisThe purchaser may use the productanalysis provision of Table 1 of Specification A788/A788M toobtain a product analysis from a forging representing each heator multiple heat.6.Mechanical Properties6.1 Tensile RequirementsThe material shall conform tothe requirements for tensile properties prescribed in Table 2.6.2 Notch Toughness RequirementsThe material shallconform to the requirements for notch toughness as prescribedin Table 2.1This specification is under the jurisdiction of ASTM 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 June 1,2013.Published June 2013.Originallyapproved in 1946.Last previous edition approved in 2008 as A288 91(2008).DOI:10.1520/A0288-91R13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.General Requirements7.1 Material supplied to this specification shall conform tothe requirements of Specification A788/A788M which outlinesadditional ordering information,manufacturing,requirements,testing and retesting methods,and procedures,marking,certification,product analysis variations,and additional supple-mentary requirements.7.2 If the requirements of this specification are in conflictwith the requirements of Specification A788/A788M,therequirements of this specification shall prevail.8.Sampling8.1 Test LocationTension and notch toughness test speci-mens shall be taken tangentially from prolongations on one orboth ends of the forging.The direction of the notch of theCharpy bars shall be radial.All test specimens shall be locatedat midwall and at a distance at least equal to one-half the wallthickness from the end face of the prolongation.8.2 RemovalAll tension and notch toughness test speci-mens shall be removed after final heat treatment.9.Number of Tests and Retests9.1Number of TestsThe