Spring steel
US11390936B2 · kind B2 · utility
0Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2017 |
| Grant date | Jul 19, 2022 |
| Priority date | — |
| Expiry date | Dec 28, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F1/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There is provided a spring steel including predetermined chemical composition, in which ([Ti mass %]−3.43×[N mass %])/[S mass %]>4.0, and [Ni mass %]+[Cu mass %]<0.75 are satisfied, and an appearance frequency of MnS is less than 20% among inclusions having an equivalent circle diameter of 1 μm or more which are observed at a ¼ position of a diameter from a surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.