Spring steel excellent in sag resistance and fatigue property
US7615186B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2004 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Sep 5, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The spring steel according to the present invention is a spring steel excellent in sag resistance and fatigue property containing: C: 0.5 to 0.8% by mass (hereinafter, referred to as %), Si: 1.2 to 2.5%, Mn: 0.2 to 1.5%, Cr: 1.0 to 4.0%, V: 0.5% or less (including 0%), P: 0.02% or less (excluding 0%), S: 0.02% or less (excluding 0%), Al: 0.05% or less (excluding 0%), and Fe and inevitable impurities as the balance, wherein the Si content and the Cr content satisfy the following formula (1):0.8×[Si]+[Cr]≧2.6 (1)(wherein, [Si] and [Cr] respectively represent the Si content (%) and the Cr content (%)).The spring steel is useful in improving both sag resistance and fatigue property.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.