JPS6092050A - Production of clad steel sheet - Google Patents

Abstract

PURPOSE:To obtain a thin clad steel sheet having good quality by bringing thin sheet coils into tight contact respectively with two proximate cooling rolls under rotation, traveling synchronously the coils, dipping the cooling rolls in a molten metal and compressing and drawing the grown shells on the coils. CONSTITUTION:This sheet coils 4 are brought into tight contact respectively with two proximate cooling rolls 3 under rotation and are drawn up while the coils are traveled synchronously. Such cooling rolls 3 are dipped in a molten metal 5 and when the coils 4 are heated 7 to an adequate temp., the shells 8 of the molten metal 5 are grown on the outside surfaces of the dipped coils by contact of a diffusion solid phase. Such shells 8 are compressed and pulled up between the rolls 3 to form a thin clad steel strip 2. The tight contact clad steel sheet is produced extremely simply by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing clad steel sheets, and more particularly to a method for continuously manufacturing clad steel sheets by a fusion welding method using a drum caster.

Clad steel plates, in which the surface is made of stainless steel and the inner base material is made of carbon steel, have traditionally been produced by solid phase welding and rolling. Due to differences in Young's modulus, etc., peeling and cracking are likely to occur during rolling, making it particularly difficult to manufacture thin clad steel sheets.
The cost is also high.

The present invention has been made to eliminate such drawbacks, and by using drum casters, thin clad steel plates can be manufactured continuously by fusion bonding without going through processes such as hot rolling. This method is advantageous for manufacturing clad steel sheets made of difficult-to-work metals.

That is, the present invention provides a method for manufacturing a clad steel sheet, comprising:
Two thin plate coils are used, a thin plate is taken out from one end of the thin plate coil, and the thin plate is brought into close contact with each of the two drums, and fed into the molten metal that will become the core material in synchronization with the rotational speed of the drum,
The present invention relates to a method for manufacturing a clad steel sheet, characterized in that a solidified shell is formed on the surface of the thin sheet, and the molten metal is combined at the outlet to form a single sheet.

An example of the method of the present invention is shown in FIG.

In Figure 1, 1 is a thin plate for surface coating, 2 is a product clad steel plate, a drum that rotates with the 5Fi thin plate 1 mechanically adhered, 4 is a thin plate coil, and 5 is a molten metal that becomes the internal base material of the clad steel. , 6 is a bath water reservoir, and 7 is a thin plate preheating device.

Note that the drum 3 used has an internal cooling function, such as a water-cooled drum.

In FIG. 1, the thin plate 1 supplied from the thin plate coil 4 is
It is preheated to a certain temperature by the preheating device 7, and is immersed in the molten metal 5 in close contact with the drum 3.

The preheated thin plate 1 comes into contact with the molten metal 5, and the molten metal 5 solidifies on the surface of the thin plate to form a solidified shell 8. The solidified shell 8 formed on the surface of each drum 3 rotates in synchronization with the drum 3 and is combined to form the clad steel plate 2.

The thin plate 1 is brought into close contact with the surface of the drum 3 by a mechanical method such as tension.

Further, the thin plate 1 is preheated by the preheating device 7, and when it comes into contact with the molten metal 5, which is the internal base material, diffusion occurs between the thin plate 1 and the molten metal 5, and solid phase bonding occurs. The layer and the internal base material are integrated and become a clad steel plate due to delamination, etc. ,
In particular, since there is no step such as rolling in the method of the present invention, Table 11i
There is little chance that shear stress or the like will act between the coating layer and the internal base material, which is advantageous for manufacturing clad steel plates made of difficult-to-work materials.

Embodiment Two J-S SU8304 thin plate coils with a thickness of 0.5W were used, and the thin plate 1 (-) was heated to about 600 mm after being preheated to about 500°C by the preheating device 7 in the manner shown in FIG. It was wrapped tightly around a water-cooled drum 5 and allowed to pass through the J-K5B4SO molten metal 5 for about 2 seconds.
450 is formed, and these are combined to form a surface compensation layer α5 m? +, 3 internal base materials, total 41
A stainless steel clad with a thickness of M2 was produced at the manufacturing plant.

Also, instead of the above SUE 304, use E3U8 J30
Even if a high alloy thin plate coil such as Inconel D15X or the like was used, a similar rad steel plate could be manufactured.

As described in detail above, the method of the present invention is a method that can produce high-quality molten steel plates combined with difficult-to-work metals, etc., and is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of an embodiment of the method of the present invention. Among the sub-agents: 1) Akira Sub-agent Ryo Hagi Hara -

Claims (1)

[Claims] In the manufacturing method of clad steel plate, two thin plate coils are used, a thin plate is taken out from one end of the thin plate coil, and the thin plate is brought into close contact with two drums, and is placed in molten metal that will become stone by synchronizing with the rotational speed of the drums. 1. A method for manufacturing a clad steel sheet, which comprises supplying molten metal, forming a solidified shell on the surface of the thin sheet, and combining the molten metal at the outlet to form a single sheet.