Cooling method of high-temperature metal and manufacturing method of hot-dip galvanized steel strip

A cooling method, hot-dip galvanizing technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of uneven cooling, insufficient improvement of cooling capacity, and inability to obtain a uniform structure, etc., to achieve a beautiful surface The effect of appearance

Active Publication Date: 2022-02-25
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this method also has the following problems: Since the metal itself is also energized, the metal to be cooled is also heated, so the improvement of cooling capacity is still insufficient, and uneven cooling is likely to occur, resulting in deformation of the metal. , or can not get a uniform tissue

Method used

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  • Cooling method of high-temperature metal and manufacturing method of hot-dip galvanized steel strip
  • Cooling method of high-temperature metal and manufacturing method of hot-dip galvanized steel strip
  • Cooling method of high-temperature metal and manufacturing method of hot-dip galvanized steel strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] use Figure 1 ~ 4 The continuous alloying molten galvanized apparatus shown is manufactured under various conditions. The steel strip having a thickness of 1.2 mm x plate width 1000 mm after 1000 mm was passed through the apparatus with the line speed shown in Table 1. Immersion steel strips in the molten galvanized bath, adjust the zinc adult amount to 50 g / m by gas wiping 2 After the spray cooling device, the molten galvanized steel strip having a plating layer having a composition shown in Table 1 was obtained. In terms of the temperature of the plating bath, adjust to the appropriate value suitable for the composition of the coating and is shown in Table 1. Heating alloying of molten galvanized zinc is not performed in this example. Set an exhaust fan in the connecting portion of the shock absorber, with 3600m inventory 3 The fixed output power of / hr is running.

[0082] exist Figure 4 In the manufacturing system of the microbubble cooling water, a cooling water cont...

Embodiment 2

[0088] The molten galvanized steel strip is manufactured by the same conditions and method using the same conditions and method as in the present invention, in addition to the same conditions and methods as those of the inventive example NO. The coating composition and the bath temperature are set to invent No. 1, i.e., Al: 0.2% by mass, Zn: composition of the balance, and the bath temperature is 460 ° C.

[0089] In the example No. 22, use Figure 5 The manufacturing system of the microbubble cooling water is shown, and the transfer of microbubble cooling water is performed without using the pump, and supplied to the nozzle header. At this time, the pressure high pressure of the cooling water before microbubbles is 0.05 MPa to 0.3 MPa of NOPA.

[0090] In the example No. 23, a centrifugal pump (200SZM) made of a non-volumetric pump (200SZM) was used as a pump that was transferred from the reservoir to the nozzle header.

[0091] In the present embodiment, the amount of bubble aver...

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Abstract

The present invention provides a method of cooling a high-temperature metal by spraying a liquid, capable of sufficiently increasing the cooling capacity without using a device having a complicated structure, and capable of uniform cooling. The method for cooling a high-temperature metal according to the present invention is characterized in that a cooling liquid containing microbubbles is supplied toward the high-temperature metal being conveyed, and the high-temperature metal is cooled by the cooling liquid.

Description

Technical field [0001] The present invention relates to a cooling method of a high temperature metal and a method for producing a molten galvanized steel strip. Background technique [0002] In the field of steel art, in various cases of the manufacturing process of steel articles, there is a step in which the high temperature metal is supplied to the cooling solution in the transportation of the high temperature metal. [0003] For example, usually, in terms of alloying melt galvanized steel strips, use figure 1 The continuous alloying molten galvanized device 100 shown is manufactured as follows. First, the steel belt S after the annealing of the continuous annealing furnace (not shown) is continuously introduced into the molten galvanized bath 30, where the steel belt S is moltered. The steel strip S turned over the direction of travel through the sinking roller 32 in the molten galvanized bath 30. The steel strip S is drawn from the side of the molten galvanized bath 30 by a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/28B21B45/02C23C2/06C23C2/26C23C2/40
CPCB21B45/02C23C2/06C23C2/28C23C2/40C23C2/29
Inventor 寺崎优高桥秀行小山琢实向亮一山本章央
Owner JFE STEEL CORP
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