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Method for manufacturing molten metal plated steel strip and continuous molten metal plating equipment

A technology of molten metal and manufacturing method, applied in metal material coating process, hot dip plating process, coating and other directions, which can solve the ineffectiveness of severe melt folds, it is difficult to obtain surface roughness, and it is difficult to fully inhibit melting. Liquid wrinkles and other problems, to achieve the effect of suppressing melt wrinkles and low cost

Pending Publication Date: 2019-03-15
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, according to the research of the present inventors, in the method shown in Patent Document 1, slight melt wrinkling is improved, but it has no effect on severe melt wrinkling
In addition, in the method shown in Patent Document 2, it is necessary to install a tempering machine, a tension leveler, etc. in the previous process of the hot-dip galvanizing bath, so there is a problem of cost.
In addition, even when these devices are installed, it is considered that it is difficult to obtain ideal surface roughness due to chemical / physical changes in the galvanized coating accompanying pickling and recrystallization in pretreatment equipment and annealing furnaces. degree, it is difficult to sufficiently suppress the occurrence of melt wrinkles

Method used

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  • Method for manufacturing molten metal plated steel strip and continuous molten metal plating equipment
  • Method for manufacturing molten metal plated steel strip and continuous molten metal plating equipment
  • Method for manufacturing molten metal plated steel strip and continuous molten metal plating equipment

Examples

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Effect test

Embodiment

[0074] In the production line of hot-dip galvanized steel strip, the manufacturing test of hot-dip galvanized steel strip was carried out. Each invention example and comparative example use figure 1 Plating equipment shown. For the gas wiping nozzle, a nozzle gap of 1.2mm was used. In each inventive example and comparative example, the composition of the coating bath, the temperature T of the coating bath, the melting point T of the coating bath M , the angle θ of the nozzle, the wiping gas pressure P, the type of gas and the temperature T of the wiping gas are shown in Table 1. The distance d between the tip of the nozzle and the steel strip was set to 15 mm. The height H of the nozzle from the bath surface was set to 350 mm.

[0075] As a method of supplying gas to the gas wiping nozzle, a method of supplying gas pressurized at a predetermined pressure by a compressor is employed. Thus, a hot-dip galvanized steel strip was produced by passing a steel strip having a thi...

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Abstract

The present invention provides a method for manufacturing a molten metal plated steel strip, the method being capable of sufficiently suppressing the generation of flow lines and manufacturing a highquality molten metal plated steel strip at a low cost. The method for manufacturing a molten metal plated steel strip of the present invention is characterized in that when blowing gas from a pair ofgas wiping nozzles 20A, 20B onto a steel strip S drawn up from a molten metal bath 14 and adjusting the adhesion amounts of the molten metal on both surfaces of the steel strip S, the angle formed between the ejection port portions of the gas wiping nozzles 20A, 20B and a horizontal plane is between 10 degrees and 75 degrees inclusive, and the header pressure of the gas wiping nozzles 20A, 20B isless than 30 kPa.

Description

technical field [0001] The present invention relates to a method for manufacturing a molten metal-coated steel strip and continuous molten metal coating equipment, and in particular to gas wiping for adjusting the amount of molten metal deposited on the surface of the steel strip (hereinafter also referred to as "coating amount"). Background technique [0002] In continuous molten metal coating lines, such as figure 2 As shown, the steel strip S annealed in the continuous annealing furnace of the reducing atmosphere passes through the furnace nose 10 and is continuously introduced into the molten metal bath 14 in the coating tank 12 . Then the steel strip S is pulled upwards of the molten metal bath 14 via the synchronous roll 16 and the back-up roll 18 in the molten metal bath 14, and after being adjusted to a predetermined coating thickness by the gas wiping nozzles 20A and 20B, it is cooled and pulled to the molten metal bath 14. Post-process guidance. The gas wiping no...

Claims

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Application Information

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IPC IPC(8): C23C2/20C22C18/04C23C2/06
CPCC23C2/06C23C2/20C22C18/04C23C2/16C23C2/18C23C2/004C23C2/00344C23C2/0038C23C2/12C23C2/40C22C21/10
Inventor 寺崎优高桥秀行安福悠祐小山琢实稻叶淳史
Owner JFE STEEL CORP
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