... )Wall Thickness(mm)ASTM B338,ASME SB338,ASTM B337ASTM B8613~50.2,0.3,0.5,0.6>5~100.3 ... ,0.6,0.8,1.0,1.25,1.5, 2.0>20~300.6,0.8,1.0,1.25,1.5,2.0,2 ... , 2.0,2.5,3.0,3.5>50~601.5, 2.0,2.5,3.0,3.5, ... ,270.5,0.6,0.8,1.0,1.25,1.531,32,330.8,1.0,1.25,1.5, 2.0381.5, 2.0 ... ,0.6,0.8,1.0,1.25,1.5>15~200.5,0.6,0.8,1.0,1.25,1.5,2.0>20 ... >30~401.0~3.5M>40~501.25~3.5M>50~601.5~4.0M>60~801.5~4.5MGR1GR2 GR3 ...