ASTM_A_859_-_A_859M_-_04_2014.pdf

Designation:A859/A859M04(Reapproved 2014)Standard Specification forAge-Hardening Alloy Steel Forgings for Pressure VesselComponents1This standard is issued under the fixed designation A859/A859M;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.Scope1.1 This specification covers requirements for low-carbonage-hardeningnickel-copper-chromium-molybdenum-columbium alloy steel forgings for pressure vessel compo-nents.1.2 Forgings under this specification are available as GradesA or B.Grade A may be ordered in one or two classes asfollows:1.2.1 Grade A Class 1Normalized-and-precipitation-heat-treated,providing a minimum yield strength of 55 ksi 380MPa and a minimum tensile strength of 65 ksi 450 MPa.1.2.2 Grade A Class 2Quenched-and-precipitation-heat-treated,providing a minimum yield strength of 65 ksi 450MPa and a minimum tensile strength of 75 ksi MPa.1.2.3 Grade A was the original steel composition in thisspecification.1.3 Although the material is readily weldable,weldingprocedures are of fundamental importance and must be such asnot to affect adversely the properties of the material,especiallyin the heat-affected zone.It is presupposed that weldingprocedures will be suitable for the material being welded.1.4 Supplementary requirements,including those applicablein Specification A788/A788M,are provided for use whenadditional testing or inspection is desired.These shall applyonly when specified individually by the purchaser in the order.1.5 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-conformancewith the standard.1.6 This specification is expressed in both inch-pound andSI units.However,unless the order specifies the applicable“M”specification designation SI units,the material shall befurnished to inch-pound units.2.Referenced Documents2.1 ASTM Standards:2A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA388/A388M Practice for Ultrasonic Examination of SteelForgingsA788/A788M Specification for Steel Forgings,General Re-quirementsE208 Test Method for Conducting Drop-Weight Test toDetermine Nil-Ductility Transition Temperature of Fer-ritic SteelsE604 Test Method for Dynamic Tear Testing of MetallicMaterials2.2 ASME Standard:3ASME Boiler and Pressure Vessel CodeSection IX3.Ordering Information and General Requirements3.1 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 and the method of selecting testlocation(see 6.3).When appropriate,the areas of significantloading in the forging shall be designated.3.2 Material supplied to this specification shall conform tothe requirements of Specification A788/A788M,which out-linesadditionalorderinginformation,manufacturingrequirements,testing and retesting methods and procedures,marking,certification,product analysis variations,and addi-tional supplementary requirements.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 Oct.1,2014.Published October 2014.Originallyapproved in 1986.Last previous edition approved in 2009 as A859/A859M 04(2009).DOI:10.1520/A0859_A0859M-04R14.2For 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.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Two Park Ave.,New York,NY 10016-5990,http:/www.asme.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.3 If the requirements of this specification are in conflictwith the requirements of Specification A788/A788M,therequirements of this specification shall prevail.4.Manufacture4.1 Melting PracticeThe steel shall be made to a killed,fine austenitic grain size,practice.4.1.1 Vacuum degassing in accordance with SpecificationA788/A788M is highly recommended.4.2 Heat Treatment:4.2.1 Normalizing may,at the manufacturers option,pre-cede the prescribed heat treatment cycle.4.2.2 Grade A Class 1 forgings shall be normalized at atemperature in the range from 1600 to 1725F 870 to 940Cand then precipitation hardened in the range from 1000 to1225F 540 to 665C for a ti