BS 970-1 1996

BRITISHSTANDARDBS970-1:1996SpecificationforWroughtsteelsformechanicalandalliedengineeringpurposes—Part1:Generalinspectionandtestingproceduresandspecificrequirementsforcarbon,carbonmanganese,alloyandstainlesssteelsLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,FriJul2010:06:19GMT+00:002007,UncontrolledCopy,(c)BSIBS970-1:1996ThisBritishStandard,havingbeenpreparedunderthedirectionoftheEngineeringSectorBoard,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton15May1996©BSI10-1998FirstpublishedJuly1941SecondeditionOctober1942ThirdeditionMarch1947FourtheditionJanuary1955Fifthedition(Part1)February1972(Part2)September1970(Part2)July1971(SupplementNo.1toPart3)May1973(Part4)February1970Sixthedition(combined,asPart1)May1983SeventheditionNovember1991EightheditionMay1996ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceISE/31DraftannouncedinBSINewsSeptember1995ISBN0580251209CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedtoTechnicalCommitteeISE/31,Wroughtsteels,uponwhichthefollowingbodieswererepresented:Lloyd’sRegisterofShippingNationalAssociationofSteelStockholdersRoadVehicleSpringSocietySocietyofMotorManufacturersandTradersLimitedSpringResearchandManufacturers’AssociationDepartmentofTradeandIndustry(NationalPhysicalLaboratory)MinistryofDefenceBritishChainManufacturers’AssociationBritishEngineers’CuttingToolsAssociationBritishForgingIndustryAssociationBritishIndustrialFasteners’AssociationBritishIronandSteelProducers’AssociationBritishStainlessSteelAssociationAmendmentsissuedsincepublicationAmd.No.DateCommentsLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,FriJul2010:06:19GMT+00:002007,UncontrolledCopy,(c)BSIBS970-1:1996©BSI10-1998iContentsPageCommitteesresponsibleInsidefrontcoverForewordiiiSection1.Generalinspectionandtestingprocedure1.1Scope11.2References11.3Definitions11.4Symbols11.5General21.6Informationtobesuppliedbythepurchaser21.7Steelmakingandcastingprocess31.8Chemicalcomposition41.9Productanalysisandpermittedvariations51.10Freedomfromdefects51.11Conditionofmaterialondelivery61.12Heattreatment81.13Mechanicalproperties81.14Selectionandpreparationofmaterialformechanicaltesting81.15Frequencyofothertests91.16Testmethodsandtestresults101.17Retests111.18Inspection111.19Manufacturer’sstatement111.20Marking11Section2.Specificrequirementsforas-rolled,as-rolledandsoftenedandmicro-alloyedcarbonmanganesesteels2.1Specificrequirementsforas-rolled,andas-rolledandsoftenedsteels122.2Specificrequirementsformicro-alloyedcarbonmanganesesteels12Section3.Specificrequirementsforsteelsforsurfacehardeningbynitriding15Section4.Specificrequirementsforcasehardeningsteels16Section5.Specificrequirementsforstainlessandheatresistingsteels24Section6.Specificrequirementsforsizesandtolerances6.1Sizes276.2Mass/unitlengthtolerances276.3Dimensionaltolerances276.4Straightness276.5Length27AnnexAHardenabilitycurvesforcasehardeningsteels31AnnexBDeoxidationofsteel43FigureA.1—Hardenabilitycurvesforcasehardeningsteels32FigureA.1.1—Alloysteels32FigureA.1.1.1—Steel523H1532FigureA.1.1.2—Steel527H1733FigureA.1.1.3—Steel590H1734FigureA.1.1.4—Steel635H1534FigureA.1.1.5—Steel637H1735FigureA.1.1.6—Steel655H1335FigureA.1.1.7—Steel665H1736LicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,FriJul2010:06:19GMT+00:002007,UncontrolledCopy,(c)BSIBS970-1:1996ii©BSI10-1998PageFigureA.1.1.8—Steel665H2036FigureA.1.1.9—Steel665H2337FigureA.1.1.10—Steel708H2037FigureA.1.1.11—Steel805H1738FigureA.1.1.12—Steel805H2038FigureA.1.1.13—Steel805H2239FigureA.1.1.14—Steel808H1739FigureA.1.1.15—Steel815H1740FigureA.1.1.16—Steel820H1740FigureA.1.1.17—Steel822H1741FigureA.1.1.18—Steel832H1341FigureA.1.1.19—Steel835H1542Table1—Sulfurandphosphoruscompositionofsteels4Table2—Incidentalpercentagesofelementsinsteels4Table3—Permittedvariationsofproductanalysisfromspecifiedrange6Table4—As-rolledandas-rolledandsoftenedsteels:chemicalcompositionandmechanicalpropertyrequirements13Table5—Micro-alloyedcarbonmanganesesteels:chemicalcompositionandmechanicalpropertyrequirements14Table6—Steelforsurfacehardeningbynitriding:chemicalcomposition15Table7—Casehardeningalloysteels:chemicalcompositionandhardenabilityrequirements17Table8—Casehardeningsteels:chemicalcompositionandmechanicalpropertyrequirements19Table9—Casehardeningsteels:heattreatmentandmaximumhardnessrequirements22Table10—Ferriticandmartensiticstainlessandheatresistingsteelsintheformofforgings:chemicalcomposition,heattreatmentandmechanicalpropertyrequirements25Table11—Austeniticstainlessandheatresistingsteelsintheformofforgingsandheatresistingsteel310S31inallproductforms:chemicalcomposition,softeningtreatmentandmechanicalpropertyrequirements26Table12—Billets(otherthanstainlesssteel)forforging:standardmasspermetreandtolerances28Table13—Tolerancesforhotrolledroundandsquarebarandroughturnedrounds29Table14—Tolerancesforhotrolledhexagonalbar29Table15—Tolerancesforhotrolledflatbar30ListofreferencesInsidebackcoverLicensedCop