Abstract: Method for thermally treating a scrolling steel strip (5), said method comprising the following steps: heating the strip (5) in a zone for heating with a direct flame (10); temperature homogenisation of the strip (5) in a homogenisation chamber (20) comprising at least one radiant heating tube (25), so as to homogenise the strip (5) in temperature after the passing thereof into the zone for heating with a direct flame (10) of the preceding step; oxidation of the strip (5) in an oxidation chamber (30) with an oxidising atmosphere having an oxygen volume concentration greater than 1%; reduction of the strip (5) in a reduction zone (40).

Abstract: A hood-type annealing furnace has a base, which has a site on which a batch of a annealing material can be arranged. The annealing material arranged on the site can be covered by a protective hood, which forms an annealing space enclosed by the protective hood and the site. The protective hood can be covered by a heating hood, thereby forming an intermediate space arranged between the heating hood and the protective hood and bounded at the bottom by the base. A cooling gas system is communicably connected or connectable to the intermediate space. The cooling gas system is communicably connected or connectable to the intermediate space, to a cooling gas outlet formed on the base and communicably connected to the intermediate space, and at least one cooling gas inlet formed on the base and communicably connected to the intermediate space.

Abstract: A method for the recrystallisation annealing of a non-grain-oriented electric strip (2) in a continuous annealing and coating line (1) is presented. Therein, the electric strip (2) is heated in an induction furnace (5) to a temperature of at least 680° C. at a heating rate of at least 80 K/s and then, in an optional second continuous furnace (8), to a temperature of at least 820° C. at a heating rate of at most 20 K/s. The electric strip (2) is initially heated before the induction furnace (5) via a first continuous furnace (3) to a temperature of at least 300° C. at a heating rate of at most 60 K/s.

Abstract: 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.

Abstract: Method for thermally treating a scrolling steel strip (5), said method comprising the following steps: heating the strip (5) in a zone for heating with a direct flame (10); temperature homogenisation of the strip (5) in a homogenisation chamber (20) comprising at least one radiant heating tube (25), so as to homogenise the strip (5) in temperature after the passing thereof into the zone for heating with a direct flame (10) of the preceding step; oxidation of the strip (5) in an oxidation chamber (30) with an oxidising atmosphere having an oxygen volume concentration greater than 1%; reduction of the strip (5) in a reduction zone (40).

Abstract: A top hat furnace especially adapted for annealing steel sheet metal using a protective gas includes a protective top surrounding the batches of sheet steel metal. A cooling top is arranged above the protective top forming an intermediate space. The cooling top has a cover and a lid. The cover of the cooling top has a plurality of air nozzles so that cooling air impacts the protective top in the form of jets. At least one fan produces a flow of cooling air in the intermediate space. The distance between the air nozzles increases from the bottom of the cover towards it upper end. The distance between the nozzles is from four to twelve times greater than is the diameter of each nozzle. The cooling lid is also provided with a plurality of air nozzles. The distance between the nozzles in the cooling lid is from four to seven times greater than is the diameter of each of these nozzles.