Billet by continuous casting and manufacturing method for the same
US6905558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2002 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Nov 6, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D11/115
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A billet produced by continuous casting having little central segregation, in particular a billet of high carbon steel produced by continuous casting, and a manufacturing method therefor are provided. In the continuous casting billet, the size of the dendritic equiaxed crystal in a billet central portion is reduced to be not more than 6 mm. For this purpose, electromagnetic stirring is performed so that the inclining angle of the primary dendrite within 10 mm of a billet surface layer is increased to be not less than 10°. Furthermore, the mechanical soft reduction is performed during continuous casting so that the diameter of the center porosity in the billet central portion is reduced to be not more than 4 mm. Thereby, in particular in the manufacturing of the continuous casting billet having a carbon content of not less than 0.6% by mass and a billet size of not more than 160 mm can be provided a billet in which breaking troubles in wire drawing after rolling to a rod are reduced by reducing the central segregation in the billet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.