Si-killed steel wire rod and spring excellent in fatigue properties
US9062361B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2007 |
| Grant date | Jun 23, 2015 |
| Priority date | — |
| Expiry date | Mar 21, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A Si-killed steel wire rod for obtaining a spring excellent in fatigue properties and a spring excellent in fatigue properties obtained from the steel wire rod are provided.The Si-killed steel wire rod of the present invention contains Sr: 0.03-20 ppm (means “mass ppm”, hereinafter the same), Al: 1-30 ppm and Si: 0.2-4% (means “mass %”, hereinafter the same) respectively, and contains Mg and/or Ca by a range of 0.5-30 ppm in total.Also, in the Si-killed steel wire rod of the present invention, oxide-based inclusions present in the wire rod contain SiO2: 30-90%, Al2O3: 2-50%, MgO: 35% or below (not inclusive of 0%), CaO: 50% or below (not inclusive of 0%), MnO: 20% or below (not inclusive of 0%) and SrO: 0.2-15% respectively, and total content of (CaO+MgO) is 3% or above.A spring excellent in fatigue properties can be obtained by forming the spring from such steel wire rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.