Furnace baking method of bright annealing furnace

Abstract

The invention relates to a furnace baking method of a bright annealing furnace, which is suitable for manufacturing of a vertical type bright annealing furnace for producing stainless steel bright annealing plates. The furnace baking method is characterized by mainly comprising the following steps of: (1) checking the annealing furnace and furnace baking equipment, and installing a furnace cover of an annealing furnace body to prepare for furnace baking; (2) heating up the furnace body for many times by heating elements of all the sections of the annealing furnace, and carrying out heat preservation for one time after heating up each time; and (3) cooling, namely carrying out cooling operation on the regions of the bright annealing furnace successively from top to bottom, wherein the cooling rate is lower than 25 DEG C / h, and the step-by-step circulation regulative cooling operation is performed on each region of the annealing furnace. The furnace baking method provided by the invention has the advantages that the sufficient expansive deformation time is supplied for the furnace body, important structural members in the furnace body and a refractory material, moisture of the refractory casting material in the furnace is effectively separated out, and thus the furnace body, the important structural members and the refractory material are not damaged because of transformation; meanwhile, the atmosphere and dew point in the furnace are adjusted, the using properties of a fiber furnace lining in the annealing furnace and the structure of the annealing furnace are checked, and the good working condition of the furnace body is guaranteed.

Description

technical field [0001] The invention belongs to the field of heat treatment, is mainly applicable to the oven-baking process of a vertical muffle stainless steel bright annealing furnace, and in particular relates to an oven method of an electrically heated vertical muffle stainless steel bright annealing furnace. Background technique [0002] Vertical muffle stainless steel bright annealing furnaces are generally used in the production of stainless steel bright annealing plates that require very high surface quality. For newly built or overhauled stainless steel bright annealing furnaces, in order to effectively separate out the moisture in the refractory castables in the bright annealing furnaces, adjust the dew point in the stainless steel bright annealing furnaces, and check the annealing furnace fiber lining, electric heating elements and annealing furnace support structures In order to achieve the best performance and achieve good working condition, the stainless steel...

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Problems solved by technology

[0003]The existing oven methods are all aimed at converters or continuous annealing furnaces, and there is no special oven method for bright annealing furnaces

For example, the patent for invention with the publication number CN 102732675 A "Ovening method for a new intermediate frequency furnace" discloses a method for drying a new intermediate frequency furnace suitable for the smelting industry. The new intermediate frequency furnace described in this technical proposal is a smelting Furnace, when working at high temperature, there is molten steel in the furnace, and only temperature control is involved in the furnace baking process, without the control of protective atmosphere such as hydrogen and nitrogen, which is significantly different from the bright annealing furnace described in the present invention. There is no heat preservation process in the process of heating up to 800-900 ° C, and there is no sufficient expansion and deformation time for the furnace body, important structural parts and refractory materials in the furnace body

The patent for invention with the publication number CN 102605163 A "a method for drying a continuous annealing furnace" discloses the drying process after the maintenance of a continuous annealing furnace for cold-rolled non-oriented silicon steel that is suitable for protecting the gas in the furnace without humidification: "According to conventional The heating rate is raised to 700~760°C". This technical solution has no heat preservation process during the temperature rise to 700~760°C, that is, the annealing furnace body is not expanded and deformed by the heat preservation process during the temperature rise process, and important structural parts in the furnace body and the expansion and deformation time of refractory materials are not conducive to the use of continuous annealing furnaces; and the invention patent does not provide the cooling process of continuous annealing furnaces, and the furnace body, important structural parts and refractory materials in the furnace body are prone to unnecessary deformation due to deformation during the cooling process. damage to

[0004] In summary, since the overall oven effect of the converter body is for steelmaking, the annealing process requirements of the continuous annealing furnace are different from the annealing process of the bright annealing furnace There is a big difference, so the simple conversion or conversion of the oven process cannot guarantee the normal operation of the bright annealing furnace

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