TOP DRIVE BEARING FOR USE IN A TOP DRIVE SYSTEM, AND MADE OF NON-VACUUM ARC REMELTED STEEL CONFIGURED TO ACHIEVE AN EXTENDED LIFE CYCLE AT LEAST EQUIVALENT TO A LIFE FACTOR OF THREE FOR A VACUUM ARC REMELTED STEEL

摘要

A top drive thrust bearing configured for use in a heavy loaded top drive system. The top drive thrust bearing includes an upper plate; a lower plate; and a plurality of rollers disposed between the upper plate and the lower plate. The composition of the top drive thrust bearing comprising a non-vacuum arc remelted steel including, in weight percent (%), about 0.15% to about 0.18% carbon (C), about 0.15% to about 0.4% silicon (Si), about 0.4% to about 0.7% manganese (Mn), 0% to about 0.025% phosphorus (P), about 0.0005% to about 0.002% sulfur (S), about 0.0002% to about 0.0007% oxygen (O), about 0.001% to about 0.003% titanium (Ti), about 1.3% to about 1.6% chromium (Cr), about 3.25% to about 3.75% nickel (Ni), about 0.0005% to about 0.003% calcium (Ca), about 0.15% to about 0.25% molybdenum (Mo), balance iron (Fe). The top drive thrust bearing of the top drive system is configured to achieve an extended life cycle at least about equivalent to a life factor of three for a vacuum arc remelted steel.

主权项

1. A top drive system comprising:
a stationary frame; a rotatable shaft within the frame; and a top drive thrust bearing surrounding the shaft; the top drive thrust bearing of the top drive system comprising:
an upper plate;a lower plate, wherein at least one of the upper plate and the lower plate is secured to the frame; anda plurality of rollers disposed between the upper plate and the lower plate; the composition of the top drive thrust bearing comprising a non-vacuum arc remelted steel comprising, in weight percent (%), about 0.15% to about 0.18% carbon (C), about 0.15% to about 0.4% silicon (Si), about 0.4% to about 0.7% manganese (Mn), 0 to about 0.025% phosphorus (P), about 0.0005% to about 0.002% sulfur (S), about 0.0002% to about 0.0007% oxygen (0), about 0.0005% to about 0.003% titanium (Ti), about 1.3% to about 1.6% chromium (Cr), about 3.25% to about 3.75% nickel (Ni), about 0.0005% to about 0.003% calcium (Ca), about 0.15% to about 0.25% molybdenum (Mo), balance iron (Fe); and wherein the top drive thrust bearing of the top drive system is configured to achieve an extended life cycle at least equivalent to a life factor of three for a vacuum arc remelted steel.