Hardbanding, as a method for protecting drill pipe tool joints from premature abrasive wear, has been in wide spread use since the late 1930’s. Tungsten Carbide has traditionally been embedded into the overlay to further extend tool joint wear life. In open-hole conditions where casing wear is not a concern, Tungsten Carbide embedded in a tough, wear resistant matrix still provides the maximum wear resistance for tool joints.
POSTALLOY© ULTRABAND™ NM
Ultraband™NM is a hard, 100% crack free Hardband designed for non-mag drill collars and related components. Control of critical elements has resulted in a hardband alloy that meets magnetic permeability specifications and offers substantially improved wear resistance compared to conventional non-mag welding alloys, like 310 stainless – a 400% to 500% improvement. In addition, the abrasion resistance of Ultraband™NM is 400% to 500% better than drill collar base materials.
Non-magnetic 316L has the same analysis as ER316, except that the carbon content is limited to a maximum of 0.03% in order to reduce the possibility of formation of intergranular carbide precipitation. This low carbon alloy is not as strong at elevated temperatures as ER316H.