BS 970-3 1991

BRITISHSTANDARDBS970-3:1991IncorporatingAmendmentNos.1and2SpecificationforWroughtsteelformechanicalandalliedengineeringpurposes—Part3:BrightbarsforgeneralengineeringpurposesLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,FriJul2010:07:21GMT+00:002007,UncontrolledCopy,(c)BSIBS970-3:1991ThisBritishStandard,havingbeenpreparedunderthedirectionoftheIronandSteelStandardsPolicyCommittee,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton20December1991©BSI11-1998FirstpublishedJuly1941SecondeditionOctober1942ThirdeditionMarch1947FourtheditionJanuary1955FiftheditionJuly1971SixtheditionDecember1991ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceISM/31Draftforcomment91/46105DCISBN0580199991CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbytheIronandSteelStandardsPolicyCommittee(ISM/-)toTechnicalCommitteeISM/31,uponwhichthefollowingbodieswererepresented:AssociatedOfficesTechnicalCommitteeBritishChainManufacturers’AssociationBritishCoalCorporationBritishForgingIndustryAssociationBritishIndustrialFastenersFederationBritishRailwaysBoardBritishSteelIndustryColdRolledSectionsAssociationDepartmentofTradeandIndustry(NationalPhysicalLaboratory)EngineeringIndustriesAssociationFederationofBritishEngineers’ToolManufacturersLloydsRegisterofShippingMinistryofDefenceNationalAssociationofSteelStockholdersRoadVehicleSpringSocietySocietyofMotorManufacturersandTradersLimitedStainlessSteelFabricators’AssociationofGreatBritainAmendmentsissuedsincepublicationAmd.No.DateComments7227September19928974November1995IndicatedbyasidelineinthemarginLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,FriJul2010:07:21GMT+00:002007,UncontrolledCopy,(c)BSIBS970-3:1991©BSI11-1998iContentsPageCommitteesresponsibleInsidefrontcoverForewordiii1Scope12Definitionsandsymbols13Informationandrequirementstobeagreedandtobedocumented24General25Steelmakingprocessandcastingmethods36Dimensionaltolerances37Selectionandpreparationoftestsamples48Testmethodsandtestresults59Chemicalcomposition610Mechanicalproperties611Retests812Freedomfromdefects813Marking9AppendixAOptions30Table1—Tolerancesforcolddrawnbars3Table2—Tolerancesforturnedbars4Table3—Tolerancesforprecisiongroundbars4Table4—Straightnesstolerances4Table5—Maximumlimitsonresidualelements6Table6—Permittedvariationsofproductanalysisfromspecifiedrange6Table7—Rounds,squaresandhexagonsinsizesfrom10mmuptoandincluding100mmdiameteroracrossflat:maximumpermissiblesurfacedefects8Table8—Flatsgreaterthan105mmwideinfree-cutting,semi-free-cuttingandcarbonsteels:maximumpermissiblesurfacedefects9Table9—Flatsgreaterthan105mmwideinhotandcoldforgingsteelsandlowalloysteels:maximumpermissibledefectdepths9Table10—Flatsequaltoorlessthan105mmwideinfree-cutting,semi-free-cuttingandcarbonsteels:maximumpermissibledefectdepths10Table11—Flatsequaltoorlessthan105mmwideinhotandcoldforgingsteelsandlowalloysteels:maximumpermissibledefectdepths10Table12—Chemicalcomposition:free-cuttingsteels10Table13—Chemicalcomposition:carbonandcarbonmanganesesteels11Table14—Chemicalcomposition:casehardeningsteels(carbonandcarbonmanganesesteels)11Table15—Chemicalcomposition:alloycasehardeningsteels11Table16—Chemicalcomposition:alloydirecthardeningsteels12Table17—Chemicalcomposition:ferriticandmartensiticstainlessandheatresistingsteels12Table18—Chemicalcomposition:Austeniticstainlessandheatresistingsteels13Table19—Mechanicalpropertiesforfree-cuttingsteels14LicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,FriJul2010:07:21GMT+00:002007,UncontrolledCopy,(c)BSIBS970-3:1991ii©BSI11-1998PageTable20—Mechanicalpropertiesforcarbonandcarbonmanganesesteels15Table21—Mechanicalpropertiesforalloysteels18Table22—Mechanicalpropertiesforcasehardeningsteels23Table23—Heattreatmentandmechanicalpropertiesforferriticandmartensiticstainlessandheatresistingsteels24Table24—Softeningtreatmentandmechanicalpropertiesforausteniticstainlessandheatresistingsteelsinthefinallysoftenedcondition26Table25—Mechanicalpropertiesforausteniticstainlesssteelsinthecolddrawncondition27Table26—Mechanicalpropertiesforausteniticstainlesssteelsinthesoftenedandfinallycolddrawncondition27Table27—Normalizingforcarbonandcarbonmanganesesteels27Table28—Hardeningandtemperingparametersforfree-cutting,carbonandcarbonmanganese,andalloysteels28Table29—Referencesymbolsfortensilestrengthrangesofhardenedandtemperedmaterial29Publication(s)referredtoInsidebackcoverLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,FriJul2010:07:21GMT+00:002007,UncontrolledCopy,(c)BSIBS970-3:1991©BSI11-1998iiiForewordThisPartofBS970hasbeenpreparedunderthedirectionoftheIronandSteelStandardsPolicyCommittee.ItsupersedesthoseclausesconcernedwithbrightfinishedbarsinBS970-1:1983,whichiswithdrawn.TechnicalCommitteeISM/31hasdecidedthatrequirementsforbarssuppliedinthebrightcoldfinishedconditionshouldbewithdrawnfromBS970-1:1983toappearinaseparatestandardforthesakeofclarityandasapreparatorysteptowardsaEuropeanStandard