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Zinc pot roller preheating method for improving surface quality of hot-dip galvanized steel plate

A technology of hot-dip galvanized steel sheet and surface quality, applied in the field of metallurgy to achieve the effect of reducing defects, reducing heat loss and small temperature difference

Pending Publication Date: 2022-02-01
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem in the prior art that the preheating of zinc pot rolls easily leads to a large amount of dross in the initial stage of production, the present invention provides a method for preheating zinc pot rolls to improve the surface quality of hot-dip galvanized steel sheets to solve the above problems

Method used

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  • Zinc pot roller preheating method for improving surface quality of hot-dip galvanized steel plate
  • Zinc pot roller preheating method for improving surface quality of hot-dip galvanized steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The zinc pot roll is hoisted into the preheating box, heated to 400°C at a heating rate of 40°C / h, and kept for 1 hour after the temperature reaches 400°C;

[0026] (2) After holding for 1 hour, continue to heat the zinc pot roll from 400°C to 440°C at a heating rate of 40°C / h, and then heat the zinc pot roller from 440°C to 460°C at a heating rate of 20°C / h, and then Incubate at 460°C for 3h;

[0027] (3) The zinc pot rolls are loaded into the zinc pot within 1 hour before the production line starts, and the hoisting is completed within 0.5 hours. The production line starts within 0.5 hours after the hoisting is completed.

[0028] (4) Continuously anneal the acid-rolled steel strip, and then put it into a zinc pot for galvanizing treatment, and the temperature of the zinc liquid is 455°C; after the zinc pot is discharged, use a moving bellows to cool the galvanized steel strip to ≤155°C.

[0029] The surface quality of the prepared galvanized sheet is good, no si...

Embodiment 2

[0031] (1) The zinc pot roll is hoisted into the preheating box, heated to 400°C at a heating rate of 30°C / h, and kept for 1 hour after the temperature reaches 400°C;

[0032] (2) After holding for 1 hour, continue to heat the zinc pot roll from 400°C to 440°C at a heating rate of 30°C / h, and then heat the zinc pot roller from 440°C to 460°C at a heating rate of 20°C / h, and then Incubate at 460°C for 3h;

[0033] (3) The zinc pot rolls are loaded into the zinc pot within 1 hour before the production line starts, and the hoisting is completed within 0.5 hours. The production line starts within 0.5 hours after the hoisting is completed.

[0034] (4) Continuously anneal the acid-rolled steel strip, and then put it into a zinc pot for galvanizing treatment, and the temperature of the zinc liquid is 455°C; after the zinc pot is discharged, use a moving bellows to cool the galvanized steel strip to ≤155°C.

[0035] The surface quality of the prepared galvanized sheet is good, no si...

Embodiment 3

[0037] (1) The zinc pot roll is hoisted into the preheating box, heated to 400°C at a heating rate of 20°C / h, and kept for 1 hour after the temperature reaches 400°C;

[0038] (2) After holding for 1 hour, continue to heat the zinc pot roll from 400°C to 440°C at a heating rate of 20°C / h, and then heat the zinc pot roller from 440°C to 460°C at a heating rate of 30°C / h, and then Incubate at 460°C for 3h;

[0039] (3) The zinc pot rolls are loaded into the zinc pot within 1 hour before the production line starts, and the hoisting is completed within 0.5 hours. The production line starts within 0.5 hours after the hoisting is completed.

[0040] (4) Continuously anneal the acid-rolled steel strip, and then put it into a zinc pot for galvanizing treatment, and the temperature of the zinc liquid is 455°C; after the zinc pot is discharged, use a moving bellows to cool the galvanized steel strip to ≤155°C.

[0041] The surface quality of the prepared galvanized sheet is good, no si...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a zinc pot roller preheating method for improving the surface quality of a hot-dip galvanized steel plate. Heat preservation is conducted at 400 DEG C, 440 DEG C and 460 DEG C respectively, and it is guaranteed that the overall temperature of the zinc pot roller is uniform. A staged heating mode is adopted, it is guaranteed that the overall temperature of the zinc pot roller is uniform, finally, heat preservation is conducted for 3 hours at the temperature of 460 DEG C, the zinc pot roller is hung into a zinc pot in a short time, heat loss in air is reduced as much as possible, the temperature difference between the zinc pot roller and molten zinc is very small, and dross precipitation caused by temperature reduction of the molten zinc is avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a zinc pot roll preheating method for improving the surface quality of hot-dip galvanized steel sheets. Background technique [0002] Zinc pot roll is an important part of hot dip galvanizing production line. During production, the zinc pot roll is immersed in the zinc liquid at about 460 ℃, rotates synchronously with the running strip, is washed by the zinc liquid and conducts heat transfer with the zinc liquid. When the temperature of the zinc pot roll is too low, the temperature of the zinc liquid will be reduced, and scum (Fe 2 Al 5 ), these dross will adhere to the surface of the galvanized steel sheet and the roll, resulting in zinc dross, sunken roll groove marks and sunken roll marks, reducing the surface quality of the galvanized sheet. The large difference between the temperature of the zinc pot roll and the temperature of the zinc liquid will also cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/40C23C2/00
CPCC23C2/06C23C2/40C23C2/003
Inventor 丁紫正高兴昌张庆东程威
Owner SD STEEL RIZHAO CO LTD
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