... ,ASTM,Q235,Q345,10#,45#,12CrMo, ,ST37 ,16Mn,Cr5Mo,15CrMoOD1/4''-24'',13mm-610mmWTSCH20,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160,XXSUsagePetroleum ... +-1.59/-0.79mmWT ToleranceWT+-12.5%ChemicalC:<0.30%,SI:>0.10%,MN:0.29-1.06%,P:<0.035%,S:<0.035%,Cu:<0.40%,Ni<0.40 ... %,Cr:<0.40%,Mo:0.15%,V:0 ...