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1.ScopeThisJapaneseIndustrialStandardspecifiesthecarbonsteeltubes,hereinafterreferredtoasthetubes,usedformachinery,automobiles,bicycles,furniture,appliancesandothermachineparts.Remark1.Theunitsandnumericalvaluesgivenin{}inthisStandardarebasedontheInternationalSystemofUnits(SI)andareappendedforinformatibereference.2.Further,thetraditionalunitsaccompaniedbynumericalvaluesinthisStandardshallbeconvertedtotheSIunitsandnumericalvaluesonJanuary1.1991.2.GradeandDesignationThegradeanddesignationofthetubeshallbeasgiveninTable1.ThesubclassificationlettersymbolsA,BandCareusedtoindicatedistinctionofmethodofmanufacturingthetube,coldworkingprocess,heattreatment,etc.Table1.GradeandDesignationGradeDEsignationGrade11ASTKM11AGrade12ASTKM12ABSTKM12BCSTKM12CGrade13ASTKM13ABSTKM13BCSTKM13CGrade14ASTKM14ABSTKM14BCSTKM14CGrade15ASTKM15ACSTKM15CGrade16ASTKM16ACSTKM16CGrade17ASTKM17ACSTKM17CGrade18ASTKM18ABSTKM18BCSTKM18CGrade19ASTKM19ACSTKM19CGrade20ASTKM20A*WorldStandardComparativeTableKSASTMJISBSNUBERGRADENUBERGRADENUBERGRADENUBERGRADED3517Grade11ASTKM11AA513A519MT1010MT1010G-3445STKM11A--Grade12ASTKM12AA513A519MT1015MT1015STKM12A980CDS-3Grade12BSTKM12B--STKM12B--Grade12CSTKM12CA512A513MT1015STKM12C--Grade13ASTKM13AA512A513A519MT1025MTX1025MT1025STKM13A--Grade13BSTKM13B--STKM13B980CDS-4Grade13CSTKM13C--STKM13C--Grade14ASTKM14AA513A519MT1030MT1030STKM14A1717CDS-103Grade14BSTKM14B--STKM14B--Grade14CSTKM14C--STKM14C--Grade15ASTKM15AA513MT1033STKM15A1717CDS-105Grade15CSTKM15C--STKM15C--Grade16ASTKM16AA519MT1040STKM16A980CDS-5Grade16CSTKM16C--STKM16C--Grade17ASTKM17AA519MT1050STKM17A9801717CDS-7CDS-107Grade17CSTKM17C--STKM17B--Grade18ASTKM18AA519MT1524STKM18A980CDS-9Grade18BSTKM18B--STKM18B--Grade18CSTKM18C--STKM18C--Grade19ASTKM19A-----Grade19CSTKM19C-----Grade20ASTKM20A--------A512MT1008-------A512A519MTX1020MTX1020-------A512A519MTX1015MTX1015-------A512A513A519MT1008MT1008MT1008-------A512A513MT1010MT1010-------A512A513A519MT1012MT1012MT1012-------A512MT1015-------A512A513A519MT1016MT1016MT1016-------A512A513A519MT1018MT1018MT1018-------A512A513A519MT1019MT1019MT1019-------A512A513A519MT1021MT1021MT1021-------A512A513A519MT1026MT1026MT1026-------A512A513A519MT1035MT1035MT1035-------A512MT1100-------A512MT1115-------A512MT1117-------A513A519MT1017MT1017-------A513A519MT1022MT1022-------A513A519MT1023MT1023-------A513A519MT1024MT1024-------A513A519MT1050MT1050-------A513MT1060-------A513MT1340-------A513A519MT1524MT1524-------A513MT4118-------A513MT4130-------A513MT4140-------A513MT5130-------A513MT8620-------A513MT8630-------A519MT1524-------A519MT1541----3.MethodofManufacture3.1ThetubesofGrades11,12and13shallbemanufacturedbyseamlessprocess,electricresistanceweldingprocess,orbuttweldingprocess,andthoseofothergradesshallbemanufacturedbyseamlessprocessorelectricresistanceweldingprocess.3.2Thetubeshallbeasmanufacturedorascold-finishedcondition,ortheyshallbesubjectedtoappropriateheattreatment.4.ChemicalComposition4.ChemicalCompositionThetubeshallbetestedinaccordancewith8.1andtheresultingladleanalysisvaluesshallconformtoTable2.Table2.chemicalCompositonGradeDesignationUnit%CSiMnPSNborVGrade11ASTKM11A0.12max.0.35max.0.60max.0.040max.0.040max.-Grade12ASTKM12A0.20max.0.35max.0.60max.0.040max.0.040max.-BSTKM12BCSTKM12CGrade13ASTKM13A0.25max.0.35max.0.30~0.900.040max.0.040max.-BSTKM13BCSTKM13CGradeASTKM14A0.30max.0.350.30~1.000.0400.040-14BSTKM14Bmax.max.max.CSTKM14CGrade15ASTKM15A0.25~0.350.35max.0.30~1.000.040max.0.040max.-CSTKM15CGrade16ASTKM16A0.35~0.450.40max.0.40~1.000.040max.0.040max.-CSTKM16CGrade17ASTKM17A0.45~0.550.40max.0.40~1.000.040max.0.040max.-CSTKM17CGrade18ASTKM18A0.18max.0.55max.1.50max.0.040max.0.040max.-BSTKM18BCSTKM18CGrade19ASTKM19A0.25max.0.55max.1.50max.0.040max.0.040max.-CSTKM19CGrade20ASTKM20A0.25max.0.55max.1.60max.0.040max.0.040max.0.15max.Remarks1.Whenthepurchaserrequiresproductanalyssisforthetubesmadeofkilledsteel,thetolerancesforthevaluesgivenaboveshallbeasspecifiedinTable2inJISG0321forseamlesssteeltubesandinTable1forelectricresistanceweldedorbuttweldedsteeltubes.2.ForthetubesofGrade15madebyelectricresistanceweldingprocess,thelowerlimitofcarboncontentmaybealteredbyagreementbetweenthepartiesconcerned.3.ForthetubesofGrade20,NbincombinationwithVmaybeadded.Inthiscase,themaximumcontentofNb+Vshallbe0.15%.5MechanicalProperties5.MechanicalProperties5.1TensileStrength,YieldPointorProofStress,andElongationThetubeshallbetestedinaccordancewith8.2andtheresultingtensilestrength,yieldpointorproofstress,andelongationshallcomplywithTable35.2BendingStrengthorFlatteningStrengthThetubeshallbetestedinaccordancewith8.3or8.4andshallbefreefromflawsorcracksontheirwallsurfaces.Thebendingtest,however,shallbeappliedtothetubes50mmorunderinoutsidediameterinlieuofflatteningtestwhenespeciallyspecifiedbythepurchaser.GradeDesignationTensilestrengthN/П{kgf/П}YieldpointorproofN/П{kgf/П}Elongation%FlatteningstrengthBendingstrengthNo.4,No.11No.12testpiecesLongitudinaldirectionNo.4,No.5testpiecesTransversedirectionDistancebetweenflatplates(H)(Disouts