Steel for spring, and method for producing spring
US10041160B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 11, 2014 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | Aug 11, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F1/021
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is high strength steel for springs that, compared to conventional high strength steel for springs, has excellent decarburization resistance and scale exfoliation property, by optimization of the added amounts of C, Si, Mn, and Cr as well as of Sb and Sn. The steel for springs contains C: more than 0.45 mass % and less than 0.65 mass %, Si: 0.15 mass % or more and 0.70 mass % or less, Mn: 0.10 mass % or more and 1.00 mass % or less, Cr: 0.20 mass % or more and 1.50 mass % or less, P: 0.025 mass % or less, S: 0.025 mass % or less, O: 0.0015 mass % or less, Sb: 0.010 mass % or more and less than 0.030 mass %, and Sn: 0.010 mass % or more and 0.030 mass % or less, under predetermined conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.