... A53GR.B: SA53B, grades, specifications:1/ 4" -28", 13.7-711.2mm 2 Seamless steel pipe for high temperature ... carbon steel pipe for ASTM A179, specifications: 3/ 4", 1" 6 -40- 101 DEG C temperature operation of ... steel tubes, steel grade: St37, St44, St52, specifications: 1/ 4" -28", 13.7-711.2mm 8 Steel seamless steel ... St45.8/ I, St35.8-St45.8/ III 9 Structural use of seamless steel pipe GB / T8162-1999 ...