DIN1629 standard, material is ST37,ST44,ST52 ,OD ;1/8" to 12" ,thickness :1mm to 30mm

seamless circular tubers of non alloy steels with special quality .

DIN1629     mechnical property   tensile strength , yield strength , elongation 
                                                St37.0  350480 ≥235 ≥25 
                                                St44.0  420550 ≥255 ≥21 
                                                St52.0  500650 ≥270 ≥21 

               chemical compositon  C    Si Mn    P S    Cr 
                                                St37.0 ≤0.17 / / ≤0.04 / 
                                                St44.0 ≤0.21 / / ≤0.04 / 
                                               St52.0 ≤0.22 ≤0.55 ≤1.7 ≤0.04 /