| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bearing material having a long rolling fatigue life. <P>SOLUTION: The bearing material satisfying the following conditions is excellent in B10 life: when the relation: [magnesium concentration]/[oxygen concentration]≤0.2 is satisfied and the examined area is 3,000 mm<SP POS="POST">2</SP>, the total number of oxide-based non-metal inclusions and sulfide-containing oxide-based non-metal inclusions having mean inclusion diameters of ≥3 μm is 100 pieces or less per 1,000 mm<SP POS="POST">2</SP>; the total number of oxide-based non-metal inclusions and sulfide-containing oxide-based non-metal inclusions having the mean inclusion diameters of ≥10 μm is 2 pieces or less per 1,000 mm<SP POS="POST">2</SP>; and the compositions of the oxide-based non-metal inclusions and the sulfide-containing oxide-based non-metal inclusions having the mean inclusion diameters of ≥10 μm, widths of ≥3 μm and lengths of ≥20 μm satisfy the relation: [magnesium concentration]/([aluminum concentration]+[calcium concentration])≤0.1, wherein the mean inclusion diameter is calculated as (length×width)<SP POS="POST">1/2</SP>. <P>COPYRIGHT: (C)2013,JPO&INPIT |
