Bright annealing furnace is mainly used for heat treatment of stainless steel product under protective atmosphere. When using the performance requirements are different, bright heat treatment process is also different.
The 300 series typical austenitic stainless steel heat treatment process is solid solution treatment. Carbide into austenite in the process of heating up, when temperature up to 1050 ~ 1150 ℃, keep it for a short time, at the same time, the carbide dissolve in the austenite. Then quickly cooled to below 350 ℃, get a uniform unidirection austenite organization.
The key of heat treatment process is rapid cooling, cooling speed reach 55 ℃/ s, try to short time of heat preservation, otherwise coarse grains, affect the Surface finish.
Series 400 ferritic stainless steel heating temperature is low (about 900 ℃), the annealing and softening tissues were obtained by using slow cooling. Martensite stainless steel adopts annealing method, Also can use segmentation of quenching and tempering treatment. In order to get qualified microstructure, the cooling section of bright annealing furnace has a lot of room to be adjusted. So, the modern advanced bright annealing furnace, the cooling section often use strong convective cooling, set three cooling section that adjust the air volume alone, Along the width of the strip and set three segments, then adjust the cooling speed of steel strip width through the air guide, control the panel type.
2)Get no oxidation and shining surface
Bright annealing which is heat treatment process with protective atmosphere. To meet the requirements of BA board, protective atmosphere in the furnace must be controled strictly, to avoid oxidation.
stay is also.In this regard, muff cover sealing good, will not happen again, such as electric heating furnace materials for protective atmosphere pollution, providing a pure environment space
The critical point is how to protect the purity of the gas in the furnace, Excellent muffle furnace sealing provides a pure environment space, put an end to the protective atmosphere pollution.
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