Annealing treating process for cold rolled steel coil

A technology for annealing and steel coils, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of reducing heat treatment production capacity, affecting product quality, steel factory output, production table cover loss of balance, etc., to reduce bonding defects The effect of increasing the incidence rate and utilization rate and reducing the cost of quality

Inactive Publication Date: 2006-11-08
ANGANG STEEL CO LTD
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Problems solved by technology

Therefore, it will have a negative impact on steel with a recrystallization temperature greater than 660 ° C, and more seriously, reduce the production capacity of h

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  • Annealing treating process for cold rolled steel coil
  • Annealing treating process for cold rolled steel coil

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[0015] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] From figure 2 It can be seen that by increasing the control temperature difference D between the coil external temperature A and the coil core temperature B at the end of the heat preservation, the time T during which the coil external temperature A is lower than the coil core temperature B can be prolonged, making the ideal The temperature E point corresponding to the intersection time between the core temperature B of the steel coil and the external temperature A of the steel coil is close to or lower than the C point, that is, theoretically, the bonding control temperature line is below 620°C, which can effectively reduce the tendency of bonding. Increase the control temperature difference D of the steel coil temperature, and increase the production capacity of the heating mantle and the furnace base on the basis of ensuring the full recrystallization of the st...

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Abstract

The present invention relates to heat treatment of metallurgical product, and is especially one annealing treatment process for cold rolled steel coil in the cover furnace. Technologically, the present invention features the high maintaining temperature difference and temperature lowering and maintaining control. That is, the annealing treatment process has raised annealing temperature below the phase change line, increased temperature difference between inside and outside the steel roll, prolonged time with steel roll outer temperature lower than the steel roll core temperature, lowering the steel roll core temperature in the later temperature maintaining stage to lower the pressure stress inside the steel roll to avoid sticking fault. The present invention has raised annealing quality and output.

Description

technical field [0001] The invention belongs to the heat treatment process of metallurgical products, in particular to the annealing process of cold-rolled steel coil bell furnace. Background technique [0002] In the production process of cold-rolled sheets in metallurgical enterprises, post-rolling annealing is an indispensable production process, and the bonding after annealing is one of the main defects that affect the yield of products. According to the production statistics of a certain factory, the bonding rate generally accounts for 0.4%-2% of the total product. Calculated on the basis of an annual output of 1 million tons of steel, the average annual waste due to bonding is as high as 4,000 tons-20,000 tons. [0003] At present, the traditional treatment process of lowering the heat preservation temperature and cooling with a hood is usually used in domestic cold rolling mills. For example, deep drawing steel is annealed at 700°C, the holding time is as long as 30-...

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Application Information

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IPC IPC(8): C21D11/00C21D1/26C21D9/46C21D9/52
Inventor 姚林刘军王义栋高毅朱新宇李丽霞
Owner ANGANG STEEL CO LTD
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