Ingot for bearing and production process
US9732395B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 27, 2012 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Jan 24, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C33/121
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method is provided with which a bearing steel, even when obtained from an ingot, is made to have a segregation part reduced in the degree of segregation and maximum inclusion diameter. The ingot contains 0.56-0.70 mass % C, 0.15-0.50 mass %, excluding 0.50 mass %, Si, 0.60-1.50 mass % Mn, 0.50-1.10 mass % Cr, 0.05-0.5 mass % Mo, up to 0.025 mass % P, up to 0.025 mass % S, 0.005-0.500 mass % Al, up to 0.0015 mass % O, and 0.0030-0.015 mass % N, with the remainder comprising Fe and incidental impurities. The ingot has a degree of segregation of 2.8 or less and a predicted value of the maximum diameter of inclusions present in 30,000 mm2 of the ingot, as calculated by extreme value statistics, of 60 μm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.