... /8"-6 5/8" 2.Grade:E,X,G,S 3.Upset:IU,EU,IEU ... .HB:Arnco100XT,150XT,300XT, Botn1000,3000 5.IPC:TC2000,TK34 For more than 40 years, we've been exploring and developing ... on. Our API drill pipes are of high physical property, for their strictly controlled processing of sulphur and phosphorus.To ensure ... ,ISO 14001, OHSAS 18001, Arnco Hardbanding Certificates and so on. 2 3/8--5 1 ...