... IU,EU,IEU 4.HB:Arnco100XT,150XT,300XT, Botn1000,3000 5.IPC:TC2000,TK34 For more than 40 years, we' ... the actual chemical analysis of each heat of steel.Strict full-length inspection especially on the weld-neck region ensures the ... in accordance to Standards of API 5DP, API7 &7-1, NS-1. RUSSIA RTN, RUSSIA GOST-R, ISO 9001,ISO 14001 ... 18001, Arnco Hardbanding Certificates and so on. 2 3/8--5 1/2 drill pipe