... .OD:2 3/8"-6 5/8" 2.Grade:E,X,G,S 3.Upset:IU,EU,IEU 4.HB:Arnco100XT,150XT,300XT, Botn1000,3000 5 ... Specification, heat treatment is on the basis of the actual chemical analysis of each heat of steel.Strict full-length inspection especially on ... the weld-neck region ensures the drill pipes are of no defects. All threads are machined by CNC Lathes and ...