Method of and apparatus for electromagnetic mixing of metal during continuous casting
US4178979A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1977 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | Jul 13, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D11/115
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A molten metal is poured into the upper end of a vertically tubular continuous-casting mold and is withdrawn as a hardened casting from the lower end of the mold. An electromagnetic field is displaced upwardly counter-current to the descending metal so as to mix the molten part of the metal and displace non-magnetic inclusions away from the hardening skin of the metal. The mold is operated in accordance with the following formula: EQU B.sup.2 .times.L=(1/.gamma.v)(16d.sup.2 +120d) wherein B equals effective strength of magnetic field in tesla, L equals overall vertical length of field in meters, .gamma. equals electrical conductivity of metal being cast in ohms.sup.-1 .times.meter.sup.-1, v equals vertical travel speed of field in meters/second, and d equals desired surface depth of non-metallic inclusions in millimeters i.e., the distance from the outer surface of the casting in a direction normal to this surface. As a rule the overall length L is varied to space the non-metallic inclusions the desired depth below the surface of the thus-produced casting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.