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
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United States of America Patent
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Jul 4, 2017
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N/A
app pub date -
Jul 10, 2014
filing date -
Jul 17, 2013
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Abstract
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).
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