One-piece stopper rod
US5024422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1990 |
| Grant date | Jun 18, 1991 |
| Priority date | — |
| Expiry date | Jul 6, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D41/186
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A one-piece refractory stopper rod has an axial bore formed therein for the introduction of inert gas into molten steel within a tundish. A metal bushing insert is copressed into the refractory stopper rod and has a threaded bore which is positioned coaxially with the bore of the stopper rod body. A metal attachment rod having an axial bore therethrough and a threaded lower shank portion is secured within the threaded bore of the metal bushing insert. The metal attachment rod has an upper threaded shank which is adapted to be secured to a stopper rod lifting mechanism associated with the tundish. The metal rod further includes a flanged portion intermediate the upper and lower shank portions which carries an annular chamfered surface. The annular chamfered surface faces a like annular chamfered surface formed in the bore of the stopper rod to define a gas-tight seal at a sealing interface therebetween. The upper shank includes an internally threaded portion adapted to receive a threaded fitting for the introduction of a pressurized inert gas to the stopper rod bore. The attachment between the metal rod and the refractory stopper rod provides increased strength, while minimizing gas…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.