... ,ST52.3,CK45,E355,16Mn,STKM13C,SAE1020,SAE1026,SAE1045 Name: cs seamless tubes cold drawn used for CNGGrade:ST52,ST52.3 ... :ID(mm)Tolerance(mm)H7H8H9H10<=30+0.021/0+0.033/0+0.052/0+0.084/030 - <=50+0.025 ... /0+0.089/0+0.140/0+0.230/0 cs seamless tubes cold drawn used for CNG