Total-hydrogen bell type furnace annealing method for cold-rolled strip steel

A cold-rolled strip steel and bell-type furnace technology, which is applied in furnaces, heat treatment furnaces, furnace types, etc., can solve problems such as the non-reducibility of nitrogen, low thermal conductivity of nitrogen, and the impact on strip quality, so as to improve the internal quality and Effect of surface quality, improvement of annealing ability, improvement of uniformity

Inactive Publication Date: 2015-07-01
JIANGSU KAITEER INDAL FURNACE
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Problems solved by technology

In the existing cold-rolled strip annealing treatment, nitrogen or nitrogen-hydrogen mixed gas protection method is mostly used, but due to the low thermal conductivity of nitrogen, the heat transfer efficiency in the annealing process is correspondingly low, and nitrogen does not have reducing The surface of the strip steel is prone to oxidation during the annealing process, which has a certain impact on the quality of the strip steel

Method used

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Embodiment Construction

[0007] A full-hydrogen bell furnace annealing method for cold-rolled strip steel has the following steps:

[0008] a. The steel strip to be annealed is placed on the charging furnace platform. Under the working load room temperature, conduct a leak test of the heating cover for 10-20 minutes, put the heating cover buckle on the furnace platform, and use nitrogen to clean the heating cover for 30-50 minutes. , so that the oxygen content in the heating mantle is not more than 1%;

[0009] b. After passing the leak test of the heating mantle, remove the heating mantle, place the cooling mantle on the furnace platform, and start air cooling;

[0010] c. Stop air cooling when the furnace temperature drops to 270°C, and the furnace fan stops running;

[0011] d. Spray water for cooling. After step c is completed for 3 minutes, start spraying water for cooling. After spraying water for 10 minutes, the furnace table fan runs at low speed. After the furnace table fan runs at low speed...

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Abstract

The invention discloses a total-hydrogen bell type furnace annealing method for cold-rolled strip steel. The annealing method comprises the following steps: a, placing to-be-annealed strip steel on a charging furnace base, and cleaning a heated bell, so that the content of the heated bell is no more than 1%; b, placing a cooling bell on the furnace base, and starting air cooling; c, when the furnace temperature is lowered to 270 DEG C, stopping air cooling, and stopping the running of a furnace base fan; d, performing water spraying cooling for ten minutes, then performing low-speed running on the furnace base fan for ten minutes, then performing high-speed running until the hottest spot temperature is lowered to 160 DEG C, and then performing low-speed running on the fan base fan; e, cleaning hydrogen gas again with nitrogen gas until the content of the hydrogen gas is no more than 5%; and f, hoisting out the cooling bell and the inner cover, and hoisting the annealed strip steel out of the furnace. The total hydrogen is adopted as a protective gas for annealing, so that not only can the heat transfer efficiency be significantly improved, and the annealing capability of the bell type furnace can be enhanced, but also the furnace temperature uniformity is improved, the mechanical performance of the strip steel can be guaranteed, and the internal quality and surface quality of cold-rolled plates can be increased.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a full hydrogen bell furnace annealing method for cold-rolled strip steel. Background technique [0002] After the cold-rolled strip is rolled, due to the lateral deviation of the thickness in the middle and the thinness on both sides, there is a gap between the strip layers, and the gap is filled with air, which makes the radial heat conductivity of the strip poor. Therefore, the cold-rolled strip after rolling Annealing treatment is required. In the existing cold-rolled strip annealing treatment, nitrogen or nitrogen-hydrogen mixed gas protection method is mostly used, but due to the low thermal conductivity of nitrogen, the heat transfer efficiency in the annealing process is correspondingly low, and nitrogen does not have reducing During the annealing process, the surface of the strip steel is prone to oxidation, which has a certain impact on the quality of the strip ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/52
Inventor 耿凯倪志荣
Owner JIANGSU KAITEER INDAL FURNACE
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