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A kind of annealing process of low-carbon cold-rolled steel plate

A technology of cold-rolled steel plate and annealing process, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of increased processing noise and increased power loss, and achieves improved flatness, reduced steel loss, and avoids oxidation and deterioration or color changing effect

Active Publication Date: 2018-09-11
河北邯钢冷轧薄板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cold-rolled steel plate after cutting usually has rough edges and curved edges, and eddy currents are easy to form during the annealing process, which increases the processing noise and increases the power loss.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of annealing process of low-carbon cold-rolled steel plate, comprises the following steps:

[0026] (1) Sealing of the annealing furnace: After the cut low-carbon cold-rolled steel sheets are stacked and leveled, the fastening bolts are used to fix them up and down, and then placed in the annealing furnace to arrange them neatly, seal the annealing furnace, and preheat until the temperature reaches 362°C.

[0027] (2) Gas purging: first, carry out 26min nitrogen purging into the annealing furnace after preheating, until the oxygen content in the annealing furnace is less than 2%; Sweep until the nitrogen content in the annealing furnace is less than 5%; among them, the nitrogen purge flow rate is 3.1m 3 / min, the hydrogen purge flow rate is 1.2m 3 / min. The purge time and flow of nitrogen purge and hydrogen purge, the heating temperature and holding time of the annealing furnace are all controlled by the pre-designed automatic control program.

[0028] (3) An...

Embodiment 2

[0031] A kind of annealing process of low-carbon cold-rolled steel plate, comprises the following steps:

[0032] (1) Sealing of the annealing furnace: After the cut low-carbon cold-rolled steel sheets are stacked and leveled, the fastening bolts are used to fix them up and down, and then placed in the annealing furnace to arrange them neatly, seal the annealing furnace, and preheat until the temperature reaches 355°C.

[0033] (2) Gas purging: first, carry out 22min nitrogen purging into the annealing furnace after preheating, until the oxygen content in the annealing furnace is less than 2%; Sweep until the nitrogen content in the annealing furnace is less than 5%; among them, the nitrogen purge flow rate is 2.8m 3 / min, the hydrogen purge flow rate is 0.8 m 3 / min. The purge time and flow of nitrogen purge and hydrogen purge, the heating temperature and holding time of the annealing furnace are all controlled by the pre-designed automatic control program.

[0034] (3) A...

Embodiment 3

[0037] A kind of annealing process of low-carbon cold-rolled steel plate, comprises the following steps:

[0038] (1) Sealing of the annealing furnace: After the cut low-carbon cold-rolled steel sheets are stacked and leveled, the fastening bolts are used to fix them up and down, and then placed in the annealing furnace to arrange them neatly, seal the annealing furnace, and preheat until the temperature reaches 370°C.

[0039] (2) Gas purging: first, carry out 27min nitrogen purging into the annealing furnace after preheating, until the oxygen content in the annealing furnace is less than 2%; Sweep until the nitrogen content in the annealing furnace is less than 5%; among them, the nitrogen purge flow rate is 3.2m 3 / min, the hydrogen purge flow rate is 1.1m 3 / min. The purge time and flow of nitrogen purge and hydrogen purge, the heating temperature and holding time of the annealing furnace are all controlled by the pre-designed automatic control program.

[0040] (3) An...

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Abstract

The invention discloses an annealing process for a low-carbon cold-rolling steel plate. The annealing process comprises four steps of annealing furnace sealing, gas blowing, annealing operation and cleaning and drying. According to the annealing process for the low-carbon cold-rolling steel plate, burrs and bending edges of the steel plate can be removed through precise gas blowing and temperature decreasing and rising, so that the flatness of the steel plate is improved, in addition, the steel loss is reduced, energy consumption is reduced, treatment noise is reduced, and the annealing process is suitable for being applied and popularized.

Description

technical field [0001] The invention relates to the technical field of steel plate annealing, in particular to an annealing process for low-carbon cold-rolled steel plates. Background technique [0002] Cold-rolled steel plate is made of hot-rolled coil as raw material, and rolled at room temperature below the crystallization temperature, referred to as cold plate. The thickness of cold-rolled steel sheet is generally between 0.1-8.0mm, and the thickness of cold-rolled steel sheet produced by most factories is less than 4.5mm. Compared with hot-rolled steel sheets, the thickness of cold-rolled steel sheets is more accurate, and the surface is smooth and beautiful. The cold-rolled steel plate after cutting usually has rough edges and curved edges, and eddy currents are easily formed during the annealing process, which increases the processing noise and increases the power loss. Therefore, there is a need for an annealing process for low-carbon cold-rolled steel sheets with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/52
CPCC21D1/26C21D1/74C21D9/52
Inventor 杨自芬
Owner 河北邯钢冷轧薄板有限公司