... development ect.OD TolleranceD<50mm,+-0.5mm ,D>50MM,+-1%WT TolleranceWT +-12.5%ChemicalC:0.17-0.24%,Si:0 ... <0.25%,Cr:<0.25%Tensile strength390MPAYield PointWT<16MM 245MPA,WT 16-30MM 235MPAElong-Ation20other testHY,ET according to requestLength2-12m ...