摘要:
The invention relates to a device for strip guidance in a hot medium, comprising a deflection roller (3, 38) which has two roller pins (23, 39) and is mounted to supporting arms (1, 2, 34, 37, 54, 57) by means of ceramic journal bearings (20, 31), wherein the journal bearings (20, 31) are in each case arranged in a bearing receptacle (45, 55) of the associated supporting arm (1, 2, 34, 37, 54, 57). The invention is characterized in that at least one of the journal bearings (20, 31) in its associated supporting arm (1, 2, 34, 37, 54, 57) is fixed in the bearing receptacle (45, 55) by means of a force-fit that engages on the outer edge of the journal bearing (20, 31) and balances the different heat expansion coefficients of the journal bearings (20, 31) and the bearing receptacle (45, 55).
摘要:
For a hot-dip coated, flat steel product, optimal wetting and adhesion of the hot dip coating are achieved by preoxidation in a DFF preheating furnace and humidification of the annealing atmosphere in a holding zone. First, the flat steel product, which is present at a temperature of 550 - 850 °C, is exposed to an oxidising atmosphere, which is introduced by injecting an oxygen-containing gas stream into the flame of a burner, for 1 - 15 s in a preoxidation section of the DFF furnace in order to form a covering FeO layer on the surface thereof, whereas a reduced or neutral atmosphere with respect to the steel surface prevails outside the preoxidation section in the DFF furnace. The flat steel product, which has been heated to a holding temperature of 600 - 1100 °C, is then annealed in a recrystallising manner under an FeO-reducing atmosphere, the dew point of which is held at -40 °C to +25 °C by the addition of moisture, cooled to a bath entry temperature of 420 - 780 °C under an atmosphere having ≤100 % N2 and a dew point of -80 °C bis -25 °C, and passed through a melt bath.
摘要:
The invention relates to a device and to a method for treating a steel sheet product (S) in a continuous manner. The device according to the invention comprises an indirectly heated annealing furnace chamber (1), a conveying system for continuously conveying the steel sheet product (S) over a conveyance path (4) leading from an inlet (5) of the annealing furnace chamber (1) to an outlet (6) of the annealing furnace chamber (1), and a nozzle assembly (D1, D2) for feeding atmospheric gas that is reactive with regard to the steel sheet product (S) into the annealing furnace chamber (1). In order to carry out a targeted treatment of the respective steel sheet product in a continuous manner in a way that is particularly economical and also reliable in operation, a first nozzle assembly (D1), from which a gas jet (G) exits during the treatment, which gas jet is directed in the direction of the inlet (5) of the annealing furnace chamber (1) and effects a first gas flow (G1) flowing over the surface of the steel sheet product (S) to be treated, and a second nozzle assembly (D2), from which a gas jet (G) exits during the treatment, which gas jet is directed in the direction of the outlet (6) of the annealing furnace chamber (1) and effects a second gas flow (G2) flowing over the surface of the steel sheet product (S) to be treated, are provided according to the invention.