KR20020042108A - Corrosion resistance clad metal plate and method for manufacturing thereof - Google Patents

Abstract

PURPOSE: A clad steel plate which has superior bonding force between dissimilar metals made of corrosion resisting material and carbon steel and is inexpensive, and a method for manufacturing the clad steel plate are provided. CONSTITUTION: The method for manufacturing a corrosion resistance clad steel plate comprises the processes of tack welding a thin strip(2) of amorphous alloy having a principal constituent of Fe as a first binder(2) onto one surface of both surfaces of a carbon steel plate; and bonding the materials by resistance core welding a corrosion resistance metal plate(4) to the tack welded part after putting a corrosion resistance metal plate on the tack welded part, wherein a thin strip(3) having a principal constituent of Ni as a second binder is tack welded onto the thin strip(2) of amorphous alloy having a principal constituent of Fe as a first binder(2), the second binder is a thin strip of stainless steel-copper alloy, the corrosion resistance metal plate(4) is titanium, zirconium, tantalum, niobium, nickel, copper and alloy thereof, a flux is coated on the first binder and the second binder, and a plurality of the first and second binders are alternately stacked. In a clad steel plate in which a corrosion resistance metal plate(4) is bonded onto one surface of both surfaces of a carbon steel plate, the clad steel plate is characterized in that a thin strip(2) of amorphous alloy having a principal constituent of Fe as a first binder is welded between the carbon steel plate and the corrosion resistance metal plate(4).

Description

Corrosion-resistant clad steel sheet and its manufacturing method {CORROSION RESISTANCE CLAD METAL PLATE AND METHOD FOR MANUFACTURING THEREOF}

The present invention relates to a corrosion resistant clad steel sheet and a method of manufacturing the same, and more particularly, to a corrosion resistant clad steel sheet having excellent mechanical bonding strength between dissimilar metals.

Unlike general metals, corrosion-resistant materials such as titanium (Ti), zirconium (Zr), tantalum (Ta), niobium (Nb), and nickel alloys are not only welded but also very expensive, so they are not used in the general industry. It is true, but because of the corrosion resistance, light weight and excellent strength of these metals, its use is limited, but it is used in a wide variety of fields. In particular, in the fields requiring excellent corrosion resistance materials such as chemical plants and environmental facilities, many clad steel sheets are used in which low-cost carbon steels are bonded to corrosion-resistant materials.The reason why these clad steel sheets are used is not only economical but also convenient to use. This is because the use value is very large. Such a clad steel sheet is manufactured by various methods, and typical examples thereof include a roll bond clad by hot rolling, an exposure clad by explosion welding, and a clad by a resistance seam welding method.

Roll-bonded clad plate manufacturing technology by hot rolling is a technology that manufactures by hot rolling with a roller at high temperature by simultaneously heating a corrosion-resistant alloy layer made of nickel alloy, nickel-copper alloy or titanium alloy and base steel carbon steel with excellent corrosion resistance. There is a problem of high cost.

Clad fabrication by explosion welding uses the explosive power of gunpowder for joining, unlike the roll bond cladding by the hot rolling. The bonding strength is slightly better than that of the roll bond clad, but the manufacturing cost is more expensive than the roll bond and the explosion There are a lot of risks due to the risk of production period, manufacturing size, such as limitations.

In order to solve this problem more economically and conveniently, a method of joining with resistance seam welding has been developed. Resistance welding is a method of welding using a heat generated by electric resistance generated by passing a large current through a metal to be welded. James Joule) is a technology that uses the principles invented. Various methods have been introduced as a technique for joining dissimilar metals by such a resistance seam welding. Among them, a binder made of copper or stainless alloy foil or mesh between a carbon steel sheet and a corrosion resistant nickel alloy steel sheet or a titanium steel sheet Inserting the resistance can be done by welding the resistance core. However, this method also has a problem that the bonding strength is not used a lot.

The present invention has been made to solve the above problems and to provide a clad steel sheet and a method for producing the clad steel sheet which is excellent in economical and economical bonding strength between dissimilar metal made of corrosion resistant material and carbon steel.

1 is a schematic diagram showing a process in which a corrosion resistant clad steel sheet according to the present invention is welded in a resistance core welding apparatus having a circular electrode.

2 is a cross-sectional perspective view of the clad steel sheet completed according to the present invention.

* Explanation of Signs of Important Parts of Drawings *

1.Material 2.Amorphous iron strip (Binder 1)

Nickel thin plate strip (Bider 2) 4.Corrosion resistant metal plate

5. Resistance core welding electrode 6. Resistance core welding bead

According to the present invention, a thin strip of an amorphous alloy containing iron as a main component as a binder is welded on one side or both sides of a carbon steel sheet, and a corrosion resistant metal plate such as nickel and titanium is placed thereon, followed by welding by resistance welding.

A thin strip of an amorphous alloy containing iron as a main binder is welded to one or both sides of the carbon steel sheet, and a thin strip of nickel, stainless steel, and copper alloy is welded to the thin strip of the amorphous alloy as a second binder.

It is characterized by producing a corrosion-resistant clad steel sheet by placing a corrosion-resistant metal plate, such as nickel, titanium, on the resistance welding.

The present invention will be described in detail below.

The present invention utilizes a thin plate of an amorphous alloy strip containing iron as a main component between a corrosion resistant material and a base metal (mainly carbon steel) as a binder for an intermediate layer, thereby making it possible to bond dissimilar metals by utilizing the characteristics of the amorphous alloy. It was intended to produce a clad steel sheet.

In the present invention, the Fe-based amorphous alloy is used as the first binder, because the Fe-based amorphous alloy does not have a sliding system that can be seen in structural crystals and has a free volume due to random atomic arrangement. This is because the electrical resistance is high, because it generates high heat during resistance welding and can have excellent bonding strength.

In other words, the iron-based amorphous thin strip has higher electrical resistance and better ductility and fluidity than general materials. Therefore, in the case of resistance seam welding, it can be bonded regardless of the shape or surface shape of the material. Since the crystallization is performed in the vicinity, when the resistance seam welding to which heat is applied at about 1000 ° C. or more is performed, the welded portion has a stable structure and has excellent bonding strength and mechanical strength.

In order to obtain a clad with superior bonding strength and excellent mechanical strength, a second steel sheet having high strength such as nickel or stainless may be laminated on the first binder at the same time to manufacture a clad steel sheet between different strengths.

Clad according to the present invention is prepared by laminating a strip of a corrosion-resistant alloy such as nickel on a strip of amorphous iron-based strip plate, as shown in Figure 1 between the corrosion-resistant metal plate and the base material to produce a core welding. According to this method, the conventional method, that is, resistance seam welding using only nickel alloy strip thin plate, or a method of resistance seam welding after laminating wire mesh, copper mesh, stainless steel, etc. on nickel alloy thin plate, has superior bonding strength. will be. At this time, the condition of the resistance seam welding can be derived the optimum welding conditions by appropriately adjusting the pressing force, current and time according to the material and thickness of the corrosion resistance material, binder and carbon steel material.

This configuration of the present invention not only bonds corrosion resistant materials such as titanium (Ti), zirconium (Zr), tantalum (Ta), niobium (Nb) and nickel to carbon steel, but also corrosion resistant materials and stainless steel or copper, aluminum Bonding with other materials may be possible, and bonding between nickel alloys, carbon steel, copper alloys, and other dissimilar materials such as carbon steel may also be possible.

In addition, when using an amorphous iron-based thin strip strip, using a strip thin plate added with elements such as boron (B) or silicon (Si) in addition to iron (Fe), it is possible to improve the fluidity during welding to increase the joint strength, In order to improve the bonding strength and mechanical strength, a plurality of first binders and second binders may be stacked for resistance seam welding, and fluxes may be applied on the binder to increase the overall effect during welding.

(Example 1)

A carbon steel (SS400) and the corrosion-resistant material of 6mm thick as the base material placed superimposing a number of the binder between the titanium having a thickness of 1.6mm force 2kg / mm ^2, the welding current from the welding machine jeohangsim 15000~40000A, the power application time of 5 to 10, the rest time of 5 It bonded together on the conditions of -10, and obtained the clad steel plate. Table 1 compares the mechanical strength of the titanium clad prepared by the method of the present invention and various conventional methods. According to Table 1, it is shown that the present invention has excellent shear strength as compared to the conventional products.

TABLE 1

Titanium Clad Mechanical Strength Comparison division Corrosion-resistant metal Binder 1 Binder 2 Shear strength (Kg / mm ² ) Tensile Strength (Kg / mm ² ) Yield strength (Kg / mm ² ) Remarks Resistance core welding (invention) Ti-Gr. 2 Amorphous Fe-strip Ni-strip 20.5 47.5 35.6 Ti-Gr. 2 Amorphous Fe-strip Stainless-strip 19 47 35 Ti-Gr. 2 Amorphous Fe-strip - 17.8 46.2 33 Resistance core welding (conventional method) Ti-Gr2 Cu-net Ni-strip 15.2 45 30 Ti-Gr2 Fe-net Ni-strip 15.2 45 30 Ti-Gr2 Stainless-net Ni-strip 16 47 32 Roll bond Ti-Gr2 - - 14.8 45 - Explosion welding Ti-Gr2 - - 15 45 - International Standard JIS 0601 Ti-Gr2 + SS400 - - ≥13.98 ≥39.18 - Resistance core welding (invention) Tr-Gr.1 Amorphous Fe-Strip Ni-strip 18.4 40.0 30.5 Tr-Gr.1 Amorphous Fe-Strip Stainless-strip 17.5 41.0 30.8 Resistance core welding (conventional method) Tr-Gr.1 Cu-net Ni-strip 14 39 27.3 Tr-Gr.1 Fe-net Ni-strip 14 39 27 Tr-Gr.1 Stainless-net Ni-strip 16 40 28 Roll bond Tr-Gr.1 - - 14.5 40 -

* Base material SS400 thickness 6mm / titanium thickness 1.6mm

(Example 2)

Clad steel sheet was manufactured by the present invention and conventional methods using nickel and nickel alloy as a corrosion resistant material. As a result, it is shown in Table 2 that the present invention can obtain a superior bonding strength than the conventional nickel strip alone.

TABLE 2

Nickel and Nickel Alloy Clad Mechanical Strength Comparison division Corrosion-resistant metal Binder 1 Binder 2 Shear strength (Kg / mm ² ) Tensile Strength (Kg / mm ² ) Yield strength (Kg / mm ² ) Remarks Resistance core welding (invention) Ni200 Amorphous Ni-strip Ni-strip 30 54 33 Ni400 Amorphous Ni-strip Stainless-strip 30 51 33 C_276 Amorphous Ni-strip Ni-strip 36 58 38.7 Ni200 Amorphous Ni-strip - 28.5 52.2 30.3 Ni400 Amorphous Ni-strip - 28.5 49.7 30.3 C_276 Amorphous Ni-strip - 33.7 57.3 36 Resistance core welding (conventional method) Ni200 - Ni-strip 25.5 51 28.9 Ni400 - Stainless-strip 26 50 30 C_276 - Ni-strip 30 54 35.7 International standard ASTM A265 ≥14.06 ≥49.21 ≥28.12

* Base material SS400 thickness 6mm / corrosion resistant metal thickness 1.6mm

(Example 3)

Using a zirconium, tantalum and niobium as a corrosion resistant material to prepare a clad steel sheet according to the present invention and the existing method. As shown in Table 3, according to the present invention shows a strength similar to that of titanium and the like, it can be seen that the present invention is also excellent in cladding of such a corrosion-resistant special metal.

TABLE 3

Zirconium, Tantalum and Niobium Clad Mechanical Strength Comparison division Corrosion-resistant metal Binder 1 Binder 2 Shear strength (Kg / mm ² ) Tensile Strength (Kg / mm ² ) Yield strength (Kg / mm ² ) Remarks Resistance core welding (invention) Zr702 Amorphous Fe-strip Ni-strip 20.2 47.1 31.2 Ta Amorphous Fe-strip Ni-strip 12.4 40 35 Nb Amorphous Fe-strip Ni-strip 12.4 40 35 Zr702 Amorphous Fe-strip - 18.0 45.2 27.8 Ta Amorphous Fe-strip - 10.6 38.1 31.6 Nb Amorphous Fe-strip - 10.6 38.1 31.6 Resistance core welding (conventional method) Zr702 Cu-net Ni-strip 15.2 45 30 Ta Cu-net Ni-strip 10.5 35 30 Nb Cu-net Ni-strip 11 34 30

* Base material SS400 thickness 6mm / corrosion resistance metal thickness 1.0mm

As shown in the embodiment of the present invention, it can be seen that the clad welded by the method according to the present invention is more advanced than the existing method, and in particular, it is excellent in shear strength directly related to the bonding force.

According to the present invention, it is possible to mass-produce and manufacture a clad with excellent bonding and strength, so that it is possible to replace other expensive corrosion-resistant clads or to increase the service life of corrosion-resistant equipment, and to manufacture equipment because of its high strength. In this case, it is possible to bring additional material cost savings, which is more economical than conventional corrosion-resistant materials, and the effect of expanding the bottom side is expected.

Claims (11)

After welding a thin strip of an amorphous alloy containing iron as a primary binder to one or both surfaces of the carbon steel sheet, A method for producing a corrosion-resistant clad steel sheet comprising placing a corrosion-resistant metal plate thereon and performing resistance welding. The method of claim 1, A method for producing a corrosion-resistant clad steel sheet, wherein a thin plate strip containing nickel as a second binder is welded on a thin plate strip of an amorphous alloy containing iron as a main binder as the first binder. The second binder is a method for producing a corrosion-resistant clad steel sheet, characterized in that the thin strip of stainless steel, copper alloy. The method according to claim 1 or 2, The corrosion-resistant metal plate is titanium, zirconium, tantalum, niobium, nickel, copper and a method for producing a corrosion-resistant clad steel sheet, characterized in that the alloy. The method according to claim 1 or 2, Flux is applied to the said 1st binder and the 2nd binder, The manufacturing method of the corrosion resistant clad steel plate characterized by the above-mentioned. The method of claim 2, A method of manufacturing a corrosion resistant clad steel sheet, wherein the first binder and the second binder are alternately stacked. In a clad steel sheet in which a corrosion resistant metal plate is bonded to one side or both sides of a carbon steel sheet, A clad steel sheet, wherein a thin strip of an amorphous alloy containing iron as a main component is welded between a carbon steel sheet and a corrosion resistant metal sheet. The method of claim 7, wherein A clad steel sheet, further comprising a thin strip strip containing nickel as a main component as a second binder on a thin strip strip of an amorphous alloy containing iron as a main binder as the first binder. The method of claim 8, The second binder is a method for producing a corrosion-resistant clad steel sheet, characterized in that the thin strip of stainless steel, copper alloy. The method according to claim 7 or 8, The corrosion-resistant metal plate is a method of producing a corrosion-resistant clad steel sheet, characterized in that titanium, zirconium, tantalum, Naob, nickel, copper and alloys thereof. The method of claim 8, A method for producing a corrosion-resistant clad steel sheet, characterized in that the plurality of first binder and the second binder are laminated alternately.