Loading patent…
AssigneeKoyo Seiko Co., Ltd.
InventorsYutaka Kurebayashi, Sadayuki Nakamura, Kiyoyuki Hattori, Katsuhiko Kizawa
Estimating the term…
A steel for a large bearing suitable for parts of a large-sized bearing which are excellent in resistance to breakage and rolling fatigue life characteristics, and having a chemical composition by mass percentage of 0.80 to 1.30% of C, more than 0.35% and not more than 0.80% of Si, 0.30 to 0.90% of Mn, 0.90 to 1.50% of Cr, one or both of not more than 0.25% of Mo and 0.20 to 1.50% of Ni, the remainder being Fe and inevitable impurities, and exhibiting the following quench-hardenability measured according to a method specified in JIS G 0561: a HRC of 64 or more at J 1.5 mm, a HRC of 63 to 66 at J 7 mm, a HRC of 37 to 50 at J 15 mm, a HRC of 30 to 45 at J 20 mm, a HRC of 28 to 38 at J 45 mm.
A steel for a large-sized bearing consisting by mass percentage of 0.80 to 1.30% of C, more than 0.35% and not more than 0.80% of Si, 0.30 to 0.60% of Mn, 0.90 to 1.50% of Cr, the remainder being Fe and incidental impurities, and having quench-hardenability of HRC64 or more at J 1.5 mm, HRC63 to 66 at J 7 mm, HRCS7 to 50 at J 15 mm, HRC30 to 45 at J 20 mm and HRC28 to 38 at J 45 mm, wherein said hardenability is measured according to a method of hardenability test for steel specified in JIS G 0561.
A steel for a large-sized bearing consisting by mass percentage of 0.80 to 1.30% of C, more than 0.35% and not more than 0.80% of Si, 0.30 to 0.60% of Mn, 0.90 to 1.50% of Cr, one or both of not more than 0.25% of Mo and 0.20 to 1.50% of Ni, the remainder being Fe and incidental impurities, and having quench-hardenability of HIRC64 or more at J 1.5 mm, HRCOS to 66 at J 7 mm, HR037 to 50 at J 15 mm, HRC30 to 45 at J 20 mm and HRC28 to 38 at J 45 mm, wherein said hardenability is measured according to a method of hardenability test for steel specified in JIS G 0561.
Dependencies are inferred from the claim text.