... T8163, T3087, 10#20# specification 1/ 2" -34", SCH10-SCHXXX wall thickness. 1 general purpose of seamless steel pipe ASTM ... for ASTM A333, GR.A, GR.1, GR. 6 grade: A, GR.7, GR.3, specifications:1/ 4" -28", 13 ... welded 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 ...