... 4",4-1/2",5",5-1/2",Steel Grade:E75, X95, G105, S135 Type of end finish:EU,IU, ... thickness:6.45 to 12.7mm4) Grade:E75,X95,G105,S1355) Length:R1:6.1-7.01mm, R2:8 ... on the basis of the actual chemical analysis of each heat of steel.Strict full-length inspection especially on the ... rolled. The products shall be equipped with pressed steel or plastic steel thread protectors on the connections. Drill pipes of ...