1、Designation:A472/A472M07(Reapproved 2017)Standard Specification forHeat Stability of Steam Turbine Shafts and Rotor Forgings1This standard is issued under the fixed designation A472/A472M;the number immediately following the designation indicates the yearof original adoption or,in the case of revisi
2、on,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 the determination of heatstability of steam turbine shafts and rotor forgings to
3、ensurestability at operating temperature.This specification is notordinarily applicable to generator rotor forgings.1.2 This specification is expressed in both inch-pound unitsand in SI units;however,unless the purchase order or contractspecifies the applicable M specification designation(SI units),
4、the inch-pound units shall apply.The values stated in eitherinch-pound units or SI units are to be regarded separately asstandard.Within the specification,the SI units are shown inbrackets.The values stated in each system may not be exactequivalents;therefore,each system shall be used independentlyo
5、f the other.Combining values from the two systems mayresult in nonconformance with the standard.1.3 Supplementary requirements of an optional nature areprovided for use at the option of the purchaser.The supple-mentary requirements shall apply only when specified indi-vidually by the purchaser in th
6、e purchase order or contract.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations pr
7、ior to use.2.Ordering Information2.1 It shall be the responsibility of the purchaser to specifyall requirements necessary for testing under this specification.Requirements to be considered include,but are not limited to,the following:2.1.1 ASTM designation and year date,2.1.2 The minimum test temper
8、ature,2.1.3 The portion of the forging to be subjected to the heatstability test temperature,and2.1.4 Supplementary or other special requirements.3.Procedure3.1 The heat stability test shall be conducted by the forgingsupplier after final heat treatment and after the forging has beencentered and mac
9、hined with allowance to finish to the purchas-ers drawing.Material for mechanical tests may be removedbefore or after the stability test at the manufacturers option,unless check tests after the stability test are required by thepurchaser.3.2 With prior approval from the purchaser,the forgingsmay be
10、stress-relieved as part of the heat stability test.Whenthis is done,the stress-relieving temperature shall be within 50to 100 F 30 to 55 C below final tempering temperature.Rotate the forgings at 2 to 4 r/min and hold at stress-relievingtemperature for at least 2 h/in.2 h/25 mm of maximum radialthic
11、kness,after which the temperature may be decreased to thespecified heat stability test temperature and the test performed.4.Heat Stability Test Bands4.1 The supplier shall mark positionsA,B,C,and D,spaced90 apart circumferentially,preferably on an end of the forging.Markings shall be retained throug
12、hout all subsequent opera-tions.4.2 Preferably,there shall be a minimum of 5 test bands,denoted as 1,2,3,4,and 5,machined on the circumference ofthe forging.Numbering shall start at the left side of the forgingdrawing.Bands 1 and 5 shall be located as close to the end ofthe forging as practical.Band
13、 3 shall be located as near tomidlength as practical.Bands 2 and 4 shall be locatedapproximately equidistant between 1 and 3,and 3 and 5,respectively.4.3 When the shipped length of the barrel portion of theforging is less than 8 ft 2.4 m,bands 2 and 4 may be omitted.4.4 The purchasers drawing may sh
14、ow the desired numberand location of bands and shall indicate that portion of theforging that shall be located within the heating chamber.Bands1 and 5 are to be located outside of the heating chamber.Preferably,the gland areas/packing seal areas are inside theheating chamber.4.5 The test bands shall
15、 be machined with the forgingrunning on centers except in the cases of forgings weighingover 125 000 lb 56.7 metric tons the machining shall beperformed with the forgings running on steady rests.Readings1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and
16、Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved March 15,2017.Published March 2017.Originallyapproved in 1962.Last previous edition approved in 2012 as A472/A472M 07(2012).DOI:10.1520/A0472_A0472M-07R17.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardiz
