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Method for manufacturing civil high-grade anti-theft door plank

An anti-theft door panel, high-end technology, applied in anti-theft, door leaf, anti-war damage, etc., can solve problems such as scrapping, product degradation, affecting the quality of anti-theft door panels, etc., to improve the uniformity of the grain structure and refine the grain structure Effect

Active Publication Date: 2013-09-11
NINGBO IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the production of ultra-low carbon cold-rolled steel plates used in high-end anti-theft door panels, the main problem at present is that closed nests are prone to appear near the edge of the steel plate, which seriously affects the quality of the anti-theft door panels, resulting in product degradation or even scrapping

Method used

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  • Method for manufacturing civil high-grade anti-theft door plank
  • Method for manufacturing civil high-grade anti-theft door plank
  • Method for manufacturing civil high-grade anti-theft door plank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Civil high-grade anti-theft door steel plate, the weight percentage of chemical composition is: C: 0.0011%, Si: 0.015%, Mn: 0.11%, P: 0.021%, S: 0.012%, Als: 0.015%, N: 0.0050%, and the rest is Fe and unavoidable impurities.

[0074] Smelting process: hot metal desulfurization, converter smelting, RH vacuum treatment, continuous casting into billets.

[0075] Hot rolling process: the slab is sent to the heating furnace for heating, and the furnace temperature is 1200°C. After the heated slab is released from the furnace, it is descaled by high-pressure water, rough rolling, finish rolling, and laminar cooling. The thickness of the rough rolling intermediate billet is 42mm , the reduction rate of the finish rolling pass is 19%, the thickness of the finished product is 4.0mm, the finish rolling entrance temperature is 1030°C, and the finish rolling temperature is set to Ar 3 +45°C, after laminar flow cooling, the coil coiling temperature is 680°C.

[0076] In a cold rol...

Embodiment 2

[0079] Civil high-grade anti-theft door steel plate, the weight percentage of chemical composition is: C: 0.003%, Si: 0.018%, Mn: 0.10%, P: 0.015%, S: 0.01%, Als: 0.020%, N: 0.0035%, and the rest is Fe and unavoidable impurities.

[0080] Smelting process: hot metal desulfurization, converter smelting, RH vacuum treatment, continuous casting into billets.

[0081] Hot rolling and rolling process: the slab is sent into the heating furnace for heating, and the furnace temperature is 1195°C. After the heated slab is released from the furnace, it is descaled by high-pressure water, rough rolling, finish rolling, and laminar cooling. The thickness of the rough rolling intermediate billet is 42mm , the reduction rate of the finish rolling pass is 22%, the thickness of the finished product is 3.75mm, the finish rolling inlet temperature is 1020°C, and the finish rolling finish temperature is set to Ar 3 +40°C, after laminar flow cooling, the coil coiling temperature is 685°C.

[00...

Embodiment 3

[0085] Civil high-grade anti-theft door steel plate, the weight percentage of chemical composition is: C: 0.0048%, Si: 0.01%, Mn: 0.09%, P: 0.008%, S: 0.006%, Als: 0.022%, N: 0.0019%, and the rest is Fe and unavoidable impurities.

[0086]Smelting process: hot metal desulfurization, converter smelting, RH vacuum treatment, continuous casting into billets.

[0087] Hot rolling process: the slab is sent to the heating furnace for heating, and the furnace temperature is 1200°C. After the heated slab is released from the furnace, it is descaled by high-pressure water, rough rolling, finish rolling, and laminar cooling. The thickness of the rough rolling intermediate billet is 42mm , the reduction rate of the finish rolling pass is 22%, the thickness of the finished product is 3.75mm, the finish rolling entrance temperature is 1015°C, and the finish rolling temperature is set to Ar 3 +40°C, after laminar flow cooling, the coil coiling temperature is 690°C.

[0088] In a cold-roll...

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Abstract

The invention relates to a method for manufacturing a civil high-grade anti-theft door plank. The method comprises the steps of (1) obtaining a continuous casting slab by molten iron desulphurization, converter smelting, RH vacuum treatment and continuous casting for forming blanks; heating the continuous casting slab; carrying out high-pressure water descaling, rough rolling, finish rolling, laminar cooling and reeling on the heated slab after discharging from a furnace; and (2) uncoiling, pickling and trimming a hot rolled coil obtained in the step (1), rolling the rolled coil into cold-strip steel by a reversing cold rolling machine with a single frame, carrying out hood annealing treatment after degreasing, and finally carrying out smoothing, finishing and electrostatic oiling to obtain the civil high-grade anti-theft door plank. The method disclosed by the invention is stable to operate, convenient to use, free of new introduction of any production equipment, and free of increase the technological process of production; the production cost is not increased; the defect that a closed-loop vortex wave is generated when the surface of an ultra-low carbon cold-roll steel sheet is close to the edge part of the steel sheet can be effectively overcome; and the demand of the civil high-grade anti-theft door plank on high surface quality is met.

Description

technical field [0001] The invention belongs to the field of preparation of furniture materials, in particular to a preparation method of civil high-grade anti-theft door panels. Background technique [0002] In recent years, Yongkang, Zhejiang has been a well-known manufacturing base of anti-theft doors at home and abroad. During its peak production period, the monthly consumption of anti-theft door steel plates was once as high as 200,000 tons. [0003] The security level of anti-theft doors is generally divided into three types: A, B, and C. Class C has the highest anti-theft performance, and is mainly used in places with particularly high anti-theft requirements in military, financial, cultural relics and other departments. Grade B is next, and Grade A is the lowest. Most of the civil anti-theft doors sold on the market are A and B grades. The destructive opening time of A-level anti-theft door locks is not less than 15 minutes, and the anti-technical opening time is ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/02E06B3/76E06B5/11
Inventor 罗石念吴振刚佟岗吴伟娟蒋鲜林王晓飞
Owner NINGBO IRON & STEEL
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