... and/or grade StandardxOutside Diameter x Wall Thickness1Seamless Steel Tubes for high pressure boilerΦ10-159 x 2.0-1620G,15CrMoG ... , 12CrMoVGGB5310-19952Seamless Steel Tubes for structural purposeΦ10-159 x 1.0-1610,20,35 ... ,40Cr,27SiMn,20CrMo,35CrMoGB/T8162-19993Seamless Steel Tubes and pipes for liquid serviceΦ10-159 x 1.0-1610,20,Q295,Q345GB ...