各种型材的尺寸标准数据（dimensional standard data of various profiles）

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1、各种型材的尺寸标准数据（Dimensionalstandarddataofvariousprofiles）Fixedpointmeasurement,1/2position,halflegheightBendingisnotgreaterthan3mm,thetotalbendingisnotgreaterthanthetotallengthof0.3%.Channelsteelmustnothaveobvioustorsion.Theweightpermeterandallowabledeviationshallnotexceed+3%,-5%Thechannelwei

2、ghtcalculationtheory,thedensityofsteel7.85g/cm3Thecalculationformulaofchannelsectionarea:hd+2t(B-D)+0.349(r2-r21)Learningbasicknowledgeofsteel(1)Theallowabledeviationofbardiameterandlengthofthesquare(GB702-86)ThesteelbardiameterDlengtha(mm)precisiongroupAllowabledeviation(mm)1groups,2grou

3、ps,3groups5.5-7+0.20+0.30+0.40>7~20+0.25+0.35+0.40>20~30+0.30+0.40+0.50>30~50+0.40+0.50+0.60>50~80+0.60+0.70+0.80>80~110+0.90+1+1.1>110~150+1.20+1.3+1.4>150~190+2>190~250+2.5Note:theprecisiongroupshouldbemarkedinthecorrespondingproductstandardorcontract,andthethirdgroupsshouldbeexecutedac

4、cordingtotheaccuracySpecificationforroundbarnoncircularityRoundsteeldiameterD(mm)noncircularity(mm)isnotgreaterthanLessthan40ofnominaldiametertolerancesof50%40~85ofnominaldiametertolerance70%85ofnominaldiametertolerance75%SetthelengthofthediagonalsquaresteelSquarelengthofa(mm)(mm)isnotles

5、sthanthelengthofthediagonalLessthan1.33timesthenominallengthof50Morethan1.29timesthenominallengthof50Toolsteelallspecificationsnominallengthof1.29timesNote:squareoffsquare:thesquareinthesamesectiononbothsidesofanylengthdifferenceofnotgreaterthanthenominallengthtolerancesof50%,twodiagonall

6、engthdifferencenotgreaterthanthenominallengthtolerance70%StraightroundandsquaresteelbendingGroupbendingisnotgreaterthanThetotalcurvatureofthemeter(mm)12.5lengthofsteel0.25%24lengthofsteel0.4%36lengthofsteel0.6%Note:1,squaresteelmustnotbesignificantlyreversed2,roundandsquareendsoftheobliqu

7、edegreeshallnotbegreaterthanthenominaldiameteroftheroundorsquaresteelnominallength30%.RoundandsquaresteelendshearingallowslocaldeformationHotrolledstrip(GB701-91)oflowcarbonsteelTheallowabledeviationofdiameter(mm)isnotgreaterthantheroundnessisnotgreaterthan(mm)0.500