... GB) T8162, T8163, T3087, 10#20# specification 1/ 2" -34", SCH10-SCHXXX wall thickness. 1 general purpose of ... :1/ 4" -28", 13.7-711.2mm 2 Seamless steel pipe for high temperature operation of 2ASTM A106GR ... ASTM A106, A53, specifications:1/ 2 " -24",21.3-609.6mm 2 British standard ERW high-frequency welded pipe ... BS1387, specifications:1/ 2 " -12", 21.3-323.8mm The 3 ...