Mannesmann Aktiengesellschaft

Hans Gruner

Hans Schrewe

Fritz-Peter Pleschiutschnigg

Gerd Diederich

Lothar Parschat

Fritz P Pleschiutschnigg

Josef Glaser

Hans Butz

Hartwig Matzner

Heinrich-Wilhelm Rommerswinkel

Peter Wahls

Karlheinz Koch

Fritz-Peter Pleschhutschnigg

Arnold Pfeiffer

Engelbert Weins

Rolf Vest

Erich Keuper

Helmuth Orsech

Klaus Terjung

Wolfgang Sachse

Heinrich-Wilhelm Romerswinkel

Claus-Dieter Haufe

Multiple castings are cut into billets, combined in a transverse transport facility, separate into billets to be inspected or not, recombined and cooled. Transportation includes two transverse facilities and two longitudinal facilities, combined in various combinations. The transportation is carried out with only one, or no, pivoting action and cooling is provided for alongside one of the multiple transport paths with overall accommodation to subsequent transport of billets out of the system.

Quality control in multiple continuous casting plants

Following the discharge of steel from a steel producing converter, the adding and inclusion of nitrogen is impeded by surrounding the stream of pouring steel with a layer of limestone at a grain size not exceeding 5 mm. Practice has shown that the nitrogen content can well remain below a content of 0.005%.

Preventing an increase of the nitrogen content in molten steel

The particular pipe is provided with a system of blind bores being gas conductively interconnected and an inert gas is fed to this duct and channel system to traverse the gas permeable material of which the pipe is made to emerge particularly from surfaces in contact with molten steel to thereby prevent the precipitation of deposits, particularly on the inside of the pipe, but also on the outside surface thereof where being submerged in the bath of molten steel.

Injection and feeder pipe for apparatus for continuous casting of steel

A hot casting, freshly emerging from the mold, is inspected for any surface defects by a revolving line scan camera; the camera is disposed in an annular water-cooled, two-part housing having an inwardly directed annular gap covered by a sheet that revolves with the camera; the camera can look through a small gap of that sheet.

Device for inspecting a casting

A casting is inspected by equipment similar to the equipment in a companion application. That equipment includes a revolving camera. The camera is electrically powered by a generator which revolves with the camera and is, by itself, driven pursuant to that rotation.

Inspection of castings

Additives in the form of a wire-like object are introduced through a tube into the interior of molten metal bath. The wire in the tube is surrounded by a pressurized gas which prevents metal from entering the tube. Since the tube extends close to the bottom of the bath, the additives melt near that bottom and are distributed in the bath through convective flow.

Feeding additives into the interior of molten metal

A stream of molten metal is monitored as to emitted radiation to detect the onset of inclusion of slag for stopping the stream.

Supervising casting flow

A casting powder for steel having, for example, ground blast furnace slag, and/or sand and caustic lime CaF.sub.2 as basic substances with further additives which include up to 10% of additives decomposing completely at temperatures below 600.degree. C under development of gas whereby the mole-volume of developed gas per mole-weight gas-generating additive (m.sup.3 /Kg) is not smaller than 0.5. Ammonium nitrite or ammonium carbonate is preferred whereby the gaseous decomposition products will be nitrogen, water vapor and/or carbon dioxide.

Casting powder

The steel in a tundish is treated under pressure to add Ca, Mg or a rare earth for reducing dendritic and enhancing globulitic crystallation.

Crystalline structure in continuously cast steel ingot

A cover device suitable for casting vessels or the like is constructed to have an annular edge portion connected to the vessel by spring means. The cover has also a central portion corresponding to opening of the edge portion and a locking means is provided for locking the central portion with said edge portion.

Cover device for casting vessels, ladles or other metallurgical

Molten steel pouring from a ladle into a tundish is surrounded by a vessel which is pressurized to maintain an excess pressure of an inert gas and/or a gas or vapor of a material that treats the steel, e.g., for deoxidizing, desulfurizing and/or other cleansing action. The excess pressure per se inhibits any reoxidation. Reactant material is fed to the chamber at a rate to maintain the excess pressure and/or to ensure sufficient presence of reacting material commensurate with the amount of steel passing through.

Treating a stream of molten metal

Continuously cast ingots are spray-cooled by a fanned-out flow of water which has been accellerated by pressurized air with an original nozzle direction parallel to the surface of the ingot and transversely to the direction of ingot withdrawal. The arrangement avoids cooling impediment on account of the Leiden frost phenomenon.

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Duisburg, Germany

Hans Gruner