For a more complete use of the capacity of the supplies, the cooling of the cage starting with 900-950 ° C did not conduct under the cap with heaters, but under another cap without heaters. In this case, the heated cap can be used to heat the cage on another stand, and the duration of high -temperature annealing will be reduced.
However, the acceleration of the cooling of the cage in the interval of 950-650 ° C does not ensure the receipt of steel that satisfies the requirements of GOST in relation to boxing and wavyness; In this case, the magnetic induction of steel (B2h) is reduced by 50-150 GS and the plasticity of the metal worsens. As a reliable and practical ceiling, use the technology “Ceiling Armstrong” .
Due to the fact that in all workshops for the production of cold -rolled transformer steel, high -temperature annealing is a narrow place, the implementation of measures to increase the mass of the cage will eliminate the specified drawback and increase the release of this steel.
At the Novolipetsk plant, in order to increase the productivity of the furnaces, the height of the muffle was increased by 300 mm by reducing the height of the stand, which made it possible to increase the mass of the OKB-4006 stoves from 18 to 23.8 tons and, at the same time, the annealing mode to increase the hourly furnace performance to 0, 15 t. In addition, electricity consumption was reduced by 77 leaf ket.
Work on an increase in the mass of the cage by increasing the height of the muffle in vacuum furnaces were carried out at the Upper Isetsky Plant.
It is most advisable to carry out high -temperature annealing in caps with a single -tier location of rolls. When placing heater in the stove and on the stand, heat transfer conditions improve. The hourly performance of the furnace with a garden weighing 40 tons is 0.5 g. Such stoves are installed at the Novolipetsk Metallurgical Plant.
At the Ural Institute of Metals, research was carried out on continuous speed annealing stripes.
