ASTM_A_1090_-_A_1090M_-_14.pdf

Designation:A1090/A1090M14Standard Specification forForged Rings and Hollows Produced from Steels withAtmospheric Corrosion Resistance1This standard is issued under the fixed designation A1090/A1090M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers high-strength,low-alloy steelring and hollow forgings intended primarily for use as baseplates in welded tubular structures.However use of thisspecification is not restricted to such applications and it may beused in other applications for which the attributes of thematerials,as defined by this specification,are appropriate.1.2 The atmospheric corrosion resistance of these steels inmost environments is substantially better than that of carbonstructural steel with or without copper addition(see Note 1).When exposed to the atmosphere,this steel is suitable for manyapplications in the bare(unpainted)condition.NOTE1See Guide G101 for methods of estimating the atmosphericcorrosion resistance of low-alloy steels.1.3 The thickness of forgings is limited only by the capacityof the composition to meet the specified mechanical propertyrequirements;however,current practice normally limits thethickness of forgings furnished under this specification to arange of 2 to 6 in.51 to 152 mm.NOTE2When the steel is to be welded,a welding procedure suitablefor the grade of steel and intended use or service should be used.SeeAppendix X3 of Specification A6/A6M for information on weldability.1.4 The text of this specification contains notes,footnotes,or both that provide explanatory material.Such notes andfootnotes,excluding those in tables and figures,do not containany mandatory requirements.1.5 Supplementary requirements are available but shallapply only when specified by the purchaser at the time ofordering.1.6 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.1.7 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 prior to use.2.Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars,Plates,Shapes,and Sheet PilingA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA788/A788M Specification for Steel Forgings,General Re-quirementsA1058 Test Methods for Mechanical Testing of SteelProductsMetricE112 Test Methods for Determining Average Grain SizeG101 Guide for Estimating the Atmospheric Corrosion Re-sistance of Low-Alloy Steels3.Ordering Information3.1 In addition to the ordering information required bySpecification A788/A788M,the purchaser shall specify:3.1.1 Grade designation.3.1.2 Surface condition(for example,as-forged,rough ma-chined etc.).3.1.3 Include a sketch or written description of the forgingwith the inquiry and order.3.2 The purchaser may specify:3.2.1 Limits on repair welding,if permissible.3.2.2 Non-destructive evaluation,in which case reportingand acceptance criteria must be provided.4.Materials and Manufacture4.1 The steel shall be deoxidized and shall be capable ofachieving an ASTM grain size of 6 or finer when evaluatedusing any of the methods in Test Methods E112.1This 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 1,2014.Published March 2014.DOI:10.1520/A1090_A1090M-142For 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 5.Chemical Composition5.1 The heat analysis shall conform to the requirementsprescribed in Table 1.5.2 Product analysis shall be conducted once per heat andshall conform to the requirements prescribed in Table 1 subjectto the product tolerances in Specification A788/A788M.5.3 The atmospheric corrosion-resistance index,calculatedon the basis of the heat analysis of the steel,as described inGuide G101 shall be 6.0 or higher.NOTE3The user is cautioned that the Guide G101 predictive equation(predictive method based on the data of Larabee and Coburn)forcalculation of an atmospheric