ASTM A288-1991(2008) Standard Specification for Carbon and Alloy Steel Forgings for Magnetic Retaining Rings for Turbine Generators《涡轮发电机磁性定位环用碳素钢和合金钢锻件的标准规范》.pdf
《ASTM A288-1991(2008) Standard Specification for Carbon and Alloy Steel Forgings for Magnetic Retaining Rings for Turbine Generators《涡轮发电机磁性定位环用碳素钢和合金钢锻件的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM A288-1991(2008) Standard Specification for Carbon and Alloy Steel Forgings for Magnetic Retaining Rings for Turbine Generators《涡轮发电机磁性定位环用碳素钢和合金钢锻件的标准规范》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A 288 91 (Reapproved 2008)Standard Specification forCarbon and Alloy Steel Forgings for Magnetic RetainingRings for Turbine Generators1This standard is issued under the fixed designation A 288; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers quenched and tempered carbonand alloy steel forgings fo
3、r 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 mathematicalconversion
4、s to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2A 275/A 275M Practice for Magnetic Particle Examinationof Steel ForgingsA 531/A 531M Practice for Ultrasonic Examination ofTurbine-Generator Steel Retaining RingsA 788/A 788
5、M Specification for Steel Forgings, GeneralRequirements3. Ordering Information3.1 In addition to the ordering information required bySpecification A 788/A 788M, the purchaser shall include withthe inquiry and order a detailed drawing, sketch, or writtendescription of the forging, including the numbe
6、r and locationof mechanical test specimens.4. Manufacture4.1 The melting processes of Specification A 788/A 788Mshall 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 212 i
7、n. (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 pipin
8、g 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
9、shall be machinedall over prior to quenching and tempering for mechanicalproperties.4.5.2 Machine to Purchasers Requirements forShipmentIf 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 th
10、e chemical compositionprescribed in Table 1.5.2 Heat AnalysisThe heat analysis obtained from sam-pling in accordance with Specification A 788/A 788M shallcomply with Table 1.5.3 Product AnalysisThe purchaser may use the productanalysis provision of Table 1 of SpecificationA 788/A 788M toobtain a pro
11、duct analysis from a forging representing each heator multiple heat.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 March 1, 2
12、008. Published April 2008. Originallyapproved in 1946. Last previous edition approved in 2003 as A 288 91(2003).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
13、standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Mechanical Properties6.1 Tensile RequirementsThe material shall conform tothe requirements for tensile properties prescribed in Tab
14、le 2.6.2 Notch Toughness RequirementsThe material shallconform to the requirements for notch toughness as prescribedin Table 2.7. General Requirements7.1 Material supplied to this specification shall conform tothe requirements of Specification A 788/A 788M which out-lines additional ordering informa
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