Electric resistance welded steel pipe for high-strength hollow stabilizer, and method for manufacturing electric resistance welded steel pipe for high-strength hollow stabilizer
US10787720B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 2016 |
| Grant date | Sep 29, 2020 |
| Priority date | — |
| Expiry date | May 28, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/001
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An electric resistance welded steel pipe manufactured by performing electric resistance welding on the steel pipe. The steel pipe having a chemical composition including by mass %, C: 0.20% to 0.40%, Si: 0.1% to 1.0%, Mn: 0.1% to 2.0%, Al: 0.01% to 0.10%, Cr: 0.01% to 0.5%, Ti: 0.01% to 0.05%, B: 0.0005% to 0.005%, Ca: 0.0001% to 0.0050%, N: 0.0050% or less, and Fe and inevitable impurities. Additionally, the steel pipe having a microstructure in which each of amounts of TiS particles, having a particle size of 10 μm or more, and MnS particles, having a particle size of 10 μm or more, are decreased to 0.1% or less in terms of cleanliness. The steel pipe having excellent fatigue resistance, exhibiting a high strength, and having an average grain size of prior austenite grains of 50 μm or less when subjected to cold forming followed by quenching and tempering treatments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.