Sms Group Gmbh

John Cockerill S.a.

Drever International S.a.

Fa. Severstal

Drever International

Jean-Pierre Crutzen

Lutz Kümmel

Frank Maschler

Jegor Bergen

Lutz Kuemmel

Michel Renard

Jean-Marc Raick

Otto Schanderl

Edgard Dosogne

Pierre Ruwet

Amedeo Di Giovanni

Method for the preoxidation of high-strength strip steel. The invention relates to an improved method for the preoxidation of high-strength strip steel in a reaction chamber arranged in a furnace chamber. The reaction chamber is sealed at a strip entrance and a strip exit against gas exchange between the furnace chamber and the reaction chamber, and a gas that forms an oxidizing atmosphere in the reaction chamber is introduced, and the gas is continuously circulated within the reaction chamber.

Method for the preoxidation of strip steel in a reaction chamber arranged in a furnace chamber

Method for thermally treating a scrolling steel strip (), said method comprising the following steps: heating the strip () in a zone for heating with a direct flame (); temperature homogenisation of the strip () in a homogenisation chamber () comprising at least one radiant heating tube (), so as to homogenise the strip () in temperature after the passing thereof into the zone for heating with a direct flame () of the preceding step; oxidation of the strip () in an oxidation chamber () with an oxidising atmosphere having an oxygen volume concentration greater than 1%; reduction of the strip () in a reduction zone ().

High-resistance steel strip comprising a temperature homogenisation chamber

A method for rinsing an overflow chamber at the bath-side end of a snout of a device for hot-dip coating a metal strip is presented. The snout guides the metal strip in a protective gas atmosphere before the metal strip is coated with a metal melt. A rinsing cycle is carried out in the overflow chamber of the snout by feeding metal melt from the molten bath into the overflow chamber and at the same time, sucking and pumping said melt out of the overflow chamber back into the molten bath. This rinsing cycle can be performed even when the snout has been retracted from the melt by supplying the melt from the molten bath to the overflow chamber with a delivery pump.

Method and device for rinsing an overflow chamber at the bath-side end of a snout of a hot-dip coating device

A method for heat treating metallic strips inside a heat treatment chamber at a pressure greater than atmospheric pressure including passing the strips through at least one heating zone of the chamber and moving the strip through at least one cooling zone of the chamber. A first protective gas atmosphere containing nitrogen and hydrogen and/or helium is established in all but at least one cooling zone. The at least one cooling zone has a second protective atmosphere containing nitrogen and a second amount of hydrogen, the second amount of hydrogen is greater than the first amount. Nitrogen is introduced into the chamber, and a protective gas containing a third hydrogen content greater than the second hydrogen content is injected into the cooling zone, producing a gas exchange between one zone of the chamber having the first protective atmosphere and the cooling zone, and controlling the flow of introduction and injection.

Atmosphere control during continuous heat treatment of metal strips

Growing community of inventors

Chaudfontaine, Belgium

Jean-Pierre Crutzen