ASTM_A_909_-_A_909M_-_06_2016.pdf

Designation:A909/A909M06(Reapproved 2016)Standard Specification forSteel Forgings,Microalloy,for General Industrial Use1This standard is issued under the fixed designation A909/A909M;the number immediately following the designation indicates the yearof 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.1.Scope*1.1 This specification covers wrought,microalloyed carbonsteel forgings for industrial use.Microalloyed steels developtheir properties by the addition of small amounts of microal-loying elements such as vanadium,columbium,titanium,ormolybdenum.The properties may be influenced also by controlof the hot working process and temperature and by control ofthe subsequent cooling rate.1.2 The forgings shall be furnished to chemical compositionand mechanical property requirements as specified herein.Chemical composition is based on standard carbon steel gradesmodified to include microalloying elements.Strength level isspecified based on desired mechanical properties in the forg-ings.Depending on the forging process,different strengthclasses may be attainable from a single chemical composition.Conversely,mechanical properties of a given strength classmay be achieved using different chemical compositions.Themanufacturer should be consulted if development of chemicalcomposition is necessary.1.3 For the purpose of this specification,forgings withmaximum section thickness of 4 in.100 mm are to beconsidered.1.4 Supplementary Requirements S1 to S8 are provided foruse when additional controls or requirements are desired.These shall apply only when specified on the purchase order.1.5 The values stated in either inch-pound units or SI(metric)units are to be regarded separately as standard.Withinthe text and tables,SI units are shown in brackets.The valuesstated in each system are not exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith this specification.1.6 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:2A29/A29M Specification for General Requirements for SteelBars,Carbon and Alloy,Hot-WroughtA275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA576 Specification for Steel Bars,Carbon,Hot-Wrought,Special QualityA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsA788/A788M Specification for Steel Forgings,General Re-quirementsA921/A921M Specification for Steel Bars,Microalloy,Hot-Wrought,Special Quality,for Subsequent Hot ForgingE10 Test Method for Brinell Hardness of Metallic MaterialsE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE45 Test Methods for Determining the Inclusion Content ofSteel3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 microalloy forgingsforgings from microalloyedsteels produced by effectively controlling the thermomechani-cal components of the forging process to achieve requiredmechanical properties with no post-forging heat treatment.3.1.2microalloy forging procedurethe written thermo-mechanical processing parameters to be followed during theproduction of a microalloy forging.It would include,but is notlimited to:starting stock size;chemical composition,includingany optional microalloying additions;reheat practice;forgingtemperature range;method of heating;cooling methods;andlot size definition.4.Ordering Information4.1 Orders for material supplied to this specification shouldinclude the information specified in 4.1 of Specification A788/1This 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 Sept.1,2016.Published September 2016.Originallyapproved in 1992.Last previous edition approved in 2011 as A909/A909M 06(2011).DOI:10.1520/A0909_A0909M-06R16.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 A788M.The purchaser should refer to Specification A788/A788M for information not contained in this specification.4.1.1 The type(see 6.1),grade(see 6.1),and the remainderof the chemical composition(see 6.2 to 6.5)should beincluded.4.2 The information contained in 4.2 of Specification A788/A788M should be specified,as necessary,to adequatelydescribe the