Patent ID: 8474541
Filing Date: 2013-07-02
Classification: B23K,B32B,C22C,E21B

Abstract:
1. A method of applying a hardband to a drill pipe containing a tool joint circumference, comprising: welding around at least a portion of said tool joint circumference a hardbanding alloy comprising iron and manganese present in the range of 67 to 87 weight percent (wt. %), niobium and chromium present in the range of 9 to 29, and boron, carbon and silicon present in the range of 3 to 6.5 wt. %; and cooling said hardbanding alloy, wherein said hardbanding alloy as welded exhibits a hardness of 45 Rc to 70 Rc and a wear rate in the range of 0.08 grams to 1.60 grams of mass loss after 6,000 cycles as measured using ASTM G65-04, Procedure A; wherein said hardbanding alloy further comprises: iron present in the range of 67.0 to 86.0 wt. %; manganese present in the range of 0.05 to 0.3 wt. %; niobium present in the range of 3.5 to 6.0 wt. %; chromium present in the range of 6.0 to 23.0 wt. %; boron present in the range of 2.5 to 4.5 wt. %; carbon present in the range of 0.5 to 2 wt. %; and silicon present in the range of 0.2 to 0.5 wt. % wherein said alloy contains up to 2.0 wt. % of an elemental impurity.