A metal foil bonding device (50) for bonding pieces of metal foil (2) on the successively conveyed sheet-shaped electrodes (1) on the conveyor plates (20) is provided. When it is detected that there is an abnormality in a piece of metal foil (2) to be bonded to the sheet-shaped electrode (1) on the conveyor plate (20) next conveyed to the metal foil bonding device (50), the conveyor plate (20) next conveyed to the metal foil bonding device (50) is temporarily stopped right before the metal foil bonding device (50).

Disclosed is a duplex stainless clad steel plate in which a duplex stainless steel plate as a cladding metal is bonded or joined to one or both surfaces of a base steel plate, in which the base steel plate comprises a predetermined chemical composition such that Nb/N is 3.0 or more and Ceq is 0.35 to 0.45, and the duplex stainless steel plate comprises: a predetermined chemical composition such that PI is 33.0 to 38.0; and a microstructure containing a ferrite phase in an area fraction of 35% to 65%, and in the microstructure, an amount of precipitated Cr is 1.00% or less and an amount of precipitated Mo is 0.50% or less.

Disclosed is a duplex stainless clad steel plate in which a duplex stainless steel plate as a cladding metal is bonded or joined to one or both surfaces of a base steel plate, in which the base steel plate comprises a predetermined chemical composition such that Nb/N is 3.0 or more and Ceq is 0.35 to 0.45, and the duplex stainless steel plate comprises: a predetermined chemical composition such that PI is 34.0 to 43.0; and a microstructure containing a ferrite phase in an area fraction of 35% to 65%, and in the microstructure, an amount of precipitated Cr is 2.00% or less and an amount of precipitated Mo is 0.50% or less.

Disclosed is a duplex stainless clad steel plate in which a duplex stainless steel plate as a cladding metal is bonded or joined to one or both surfaces of a base steel plate, in which the base steel plate comprises a predetermined chemical composition such that Nb/N is 3.0 or more and Ceq is 0.35 to 0.45, and the duplex stainless steel plate comprises: a predetermined chemical composition such that PI is 34.0 to 43.0; and a microstructure containing a ferrite phase in an area fraction of 35% to 65%, and in the microstructure, an amount of precipitated Cr is 2.00% or less and an amount of precipitated Mo is 0.50% or less.

It is an object of the present invention to provide a roll-bonded laminate controlled in warping and a method for producing the same. The method produces the roll-bonded laminate having a two-layer structure of a first metal layer and a second metal layer, by roll-bonding a first metal plate and a second metal plate, wherein the surface hardness Hv of the first metal plate is lower than the surface hardness Hv of the second metal plate; and the method comprises roll-bonding so as to satisfy the following expression (1):

0<(L.sub.1/L.sub.2)/T38(1)

wherein L.sub.1 (mm) represents an elongation amount of the first metal layer with respect to the first metal plate; L.sub.2 (mm) represents an elongation amount of the second metal layer with respect to the second metal plate; and T (mm) represents the total thickness of the roll-bonded laminate.

It is an object of the present invention to provide a roll-bonded laminate controlled in warping and a method for producing the same. The method produces the roll-bonded laminate having a two-layer structure of a first metal layer and a second metal layer, by roll-bonding a first metal plate and a second metal plate, wherein the surface hardness Hv of the first metal plate is lower than the surface hardness Hv of the second metal plate; and the method comprises roll-bonding so as to satisfy the following expression (1):

0<(L.sub.1/L.sub.2)/T38(1)

wherein L.sub.1 (mm) represents an elongation amount of the first metal layer with respect to the first metal plate; L.sub.2 (mm) represents an elongation amount of the second metal layer with respect to the second metal plate; and T (mm) represents the total thickness of the roll-bonded laminate.

A method for manufacturing a composite slab to manufacture a plural layer clad material composed of different kinds of metals, the method including: a preparation process to prepare a bottom portion, a metallic box body having a peripheral wall portion standing on a peripheral edge of the bottom portion, and a metallic sealing body to seal an opening of the box body; a butting process to butt a side face of the sealing body against an inner wall face of the peripheral wall portion to form a butted portion with intermediate members being inserted in a recessed portion of the box body and a closing process to join and close the butted portion. At least one of the intermediate members is made of a material different from at least one of the box body and the sealing body.

Disclosed is a method for producing a composite material, wherein two or more composite components are arranged with respect to one another by casting to form a composite, so as to create a contact region essentially without a material bond between the composite components, wherein the composite components are thereafter materially bonded to one another in the contact region by means of a hot-rolling process.

Disclosed is a method for producing a composite material, wherein two or more composite components are arranged with respect to one another by casting to form a composite, so as to create a contact region essentially without a material bond between the composite components, wherein the composite components are thereafter materially bonded to one another in the contact region by means of a hot-rolling process.

A method for manufacturing a clad material (110, 410) includes performing a Ni plating treatment on a Cu material (104, 404) made of Cu or a Cu-based alloy to make a Ni-plated Cu material in which the Cu material is covered with a Ni plating layer, performing a heat treatment on the Ni-plated Cu material at a holding temperature of 650 C. or higher and 850 C. or lower, and bonding an Al material (102, 402) made of Al or an Al-based alloy and the Ni-plated Cu material on which the heat treatment has been performed to each other by rolling to make the clad material.