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Hot rolling thin strip direct hot galvanizing method based on CO reduction

A hot-dip galvanizing and thin-strip technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of product surface quality influence, complex process, equipment, influence reduction effect, etc., to avoid oxidation effect, reduce production cost, low cost

Inactive Publication Date: 2015-08-26
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this type of method is that the process and equipment are more complicated
However, H2 reduces the oxide scale to generate water vapor, which has a strong oxidation effect on iron. Long-term production will easily affect the reduction effect and seriously affect the surface quality of the product.

Method used

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  • Hot rolling thin strip direct hot galvanizing method based on CO reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of direct hot-dip galvanizing method for hot-rolled thin strip based on CO reduction, its steps:

[0024] 1) Hot rolling the thin-slab continuous casting slab to product thickness: 1.2mm;

[0025] 2) Heat the purged and cleaned hot-rolled strip, and 2 Carried out under the atmosphere, the heating temperature is 800°C, and the heating time is 30s;

[0026] 3) Carry out the reduction reaction, the reduction temperature is 800°C, and the reduction atmosphere is CO+N 2 , where the concentration of CO is 40%, and the rest is N 2 , the reduction time is controlled to 200s;

[0027] 4) Blowing in pure N 2 Cool the strip to 490°C;

[0028] 5) Immerse in a zinc pot for galvanizing, the temperature of the zinc bath is 460°C, and the zinc dipping time is controlled as 4s; the percentage of Al in the zinc bath is 0.16%, and the rest is Zn;

[0029] 6) After skinning and coiling, the steel strip is cooled to room temperature by ventilation or forced blowing.

[0030] A...

Embodiment 2

[0032] A kind of direct hot-dip galvanizing method for hot-rolled thin strip based on CO reduction, its steps:

[0033] 1) Hot rolling the thin-slab continuous casting slab to product thickness: 1.4mm;

[0034] 2) Heat the purged and cleaned hot-rolled strip, and 2 Carried out under the atmosphere, the heating temperature is 650°C, and the heating time is 100s;

[0035] 3) Carry out the reduction reaction, the reduction temperature is 780°C, and the reduction atmosphere is CO+N 2 , where the CO concentration is 50%, and the rest is N 2 , the restoration time is controlled to 180s;

[0036] 4) Blowing in pure N 2Cool the strip to 480°C;

[0037] 5) Immerse in a zinc pot for galvanizing, the temperature of the zinc bath is 450°C, and the zinc dipping time is controlled as 4s; the percentage of Al in the zinc bath is 0.15%, and the rest is Zn;

[0038] 6) After skinning and coiling, the steel strip is cooled to room temperature by ventilation or forced blowing.

[0039] Af...

Embodiment 3

[0041] A kind of direct hot-dip galvanizing method for hot-rolled thin strip based on CO reduction, its steps:

[0042] 1) Hot rolling the thin-slab continuous casting slab to product thickness: 1.0mm;

[0043] 2) Heat the purged and cleaned hot-rolled strip, and 2 Carried out under the atmosphere, the heating temperature is 700°C, and the heating time is 80s;

[0044] 3) Carry out the reduction reaction, the reduction temperature is 760°C, and the reduction atmosphere is CO+N 2 , where the concentration of CO is 60%, and the rest is N 2 , the restoration time is controlled to 160s;

[0045] 4) Blowing in pure N 2 Cool the strip to 480°C;

[0046] 5) Immerse in a zinc pot for galvanizing, the temperature of the zinc bath is 455°C, and the zinc dipping time is controlled at 5s; the percentage of Al in the zinc bath is 0.17%, and the rest is Zn;

[0047] 6) After skinning and coiling, the steel strip is cooled to room temperature by ventilation or forced blowing.

[0048]...

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Abstract

The invention relates to a hot rolling thin strip direct hot galvanizing method based on CO reduction. The hot rolling thin strip direct hot galvanizing method comprises the following steps: conducting hot rolling on a sheet continuous casting to a product thickness; heating the hot rolling sheet after blowing and cleaning in a pure N2 atmosphere; carrying out a reduction reaction; blowing in pure N2 so that a steel strip is cooled; immerging in a zinc pot for galvanizing; adopting ventilation cooling or forced blowing cooling to room temperature after the steel strip is finished and reeled up. According to the hot rolling thin strip direct hot galvanizing method, the working procedures of acid pickling and cold rolling are eliminated, the emission of waste acid is reduced, and the environmental problem caused by acid pickling is solved; compared with a hydrogen gas reduction hot galvanizing production technology, CO gas is easily obtained in the metallurgical industry, and the cost is relatively low; the reduction product is CO2 gas, the oxidation of water vapor generated by a hydrogen gas reduction reaction on iron can be avoided, the quality of galvanizing products is improved, and the production cost can be reduced.

Description

technical field [0001] The invention relates to a galvanizing method for a steel strip, in particular to a direct hot-dip galvanizing method for a hot-rolled thin strip based on CO reduction. Background technique [0002] Galvanizing is the most common, economical and effective anti-corrosion method for steel. Hot-dip galvanized sheet has the advantages of mature technology, stable process, excellent coating performance and long service life. It is widely used in construction industry, household appliance industry, mechanical and electrical Basic industries of the national economy such as industry and automobile manufacturing. [0003] Traditional hot-dip galvanized sheets use cold-rolled substrates, and hot-rolled raw materials need to be pickled and cold-rolled before hot-dip galvanizing. Due to the progress of hot strip continuous rolling technology, especially the emergence of thin slab continuous casting and rolling process, the thickness of hot rolled strip steel is g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C23C2/06C23C2/40
Inventor 汪水泽韩斌黄全伟李国彬万江刘洋魏兵高智胡超
Owner 武汉钢铁有限公司
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