... ) standard ST52 International (GB) T8162, T8163, T3087, 10#20# specification 1/ 2" -34", SCH10-SCHXXX wall thickness. 1 general purpose of seamless steel pipe ... Seamless steel pipe for high temperature operation of 2ASTM A106GR.B: SA106B, grades, specifications: 1/ 4" -28", 13.7-711.2mm ... / I, St35.8-St45.8/ III 9 Structural use of seamless steel pipe GB / T8162-1999, grades: 10, 20, 35# # #, 45, #, ...