Method for producing roll-bonded metal sheets

A process for producing a roll-bonded clad metal sheet, wherein the process comprises:

• bringing together a metallic base material layer and a metallic cladding material layer to produce an intermediate layer packet;
• heating the intermediate layer packet to yield a heated layer packet;
• thermomechanical rolling the heated layer packet, comprising:
• performing a first rolling phase for prerolling the heated layer packet to form a metallurgical bond between the metallic base material layer and the metallic cladding material layer;
• cooling the heated layer packet after the first rolling phase;
• and
• performing a second rolling phase for final forming of a layer packet, wherein:
• the metallic cladding material layer comprises a nickel-based material whose chemical composition comprises, in % by mass, a proportion of more than 50% of Ni and a proportion of 0.5%≤Nb≤3.1%, and
• a final rolling temperature of the second rolling phase is set to a value equal to or less than 880° C. and is lower than a recrystallization stop temperature of the metallic base material layer.

A process for producing a roll-bonded clad metal sheet, wherein the process comprises:

• bringing together a metallic base material layer and a metallic cladding material layer to produce an intermediate layer packet;
• heating the intermediate layer packet to yield a heated layer packet;
• thermomechanical rolling the heated layer packet, comprising:
• performing a first rolling phase for prerolling the heated layer packet to form a metallurgical bond between the metallic base material layer and the metallic cladding material layer;
• cooling the heated layer packet after the first rolling phase, wherein the cooling comprises cooling the heated layer packet in air for a cooling time from 3 to 15 minutes;
• and
• performing a second rolling phase for final forming of a layer packet, wherein:
• the metallic cladding material layer comprises a nickel-based material whose chemical composition comprises, in % by mass, a proportion of more than 50% of Ni and a proportion of 0.5%≤Nb≤3.1%, and
• a final rolling temperature of the second rolling phase is set to a value equal to or less than 880° C.

A process for producing a roll-bonded clad metal sheet, wherein the process comprises:

• bringing together a metallic base material layer and a metallic cladding material layer to produce an intermediate layer packet;
• heating the intermediate layer packet to yield a heated layer packet;
• thermomechanical rolling the heated layer packet, comprising:
• performing a first rolling phase for prerolling the heated layer packet to form a metallurgical bond between the metallic base material layer and the metallic cladding material layer;
• cooling the heated layer packet after the first rolling phase;
• and
• performing a second rolling phase for final forming of a layer packet, wherein:
• the metallic cladding material layer comprises a nickel-based material whose chemical composition comprises, in % by mass, a proportion of more than 50% of Ni and a proportion of 0.5%≤Nb≤3.1%, and
• a final rolling temperature of the second rolling phase is set to a value equal to or less than 850° C.