High carbon steel and production method thereof
US7147730B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2003 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Feb 14, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/003
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
To provide a high carbon steel sheet having excellent hardenability and toughness, and low planar anisotropy of tensile properties affecting workability, and a method of producing the same.A high car steel sheet having chemical composition specified by JIS G 4051 (Carbon steels for machine structural use), JIS G 4401 (Carbon tool steels) or JIS G 4802 (Cold-rolled steel strips for springs), wherein more than 50 carbides having a diameter of 1.5 μm or larger exist in 2500 μm2, the ratio of number of carbides having a diameter of 0.6 μm or less with respect to all the carbides is 80% or more, and the Δr is more than −0.15 to less than 0.15, herein Δr=(r0+r90−2×r45)/4, and r0, r45, and r90 shows a r-value of the directions of 0° (L), 45° (S) and 90° (C) with respect to the rolling direction respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.