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A method of manufacture of a bar by roll-bonding of medium-alloy or high-alloy steel to mild steel involves the use of a tip composed of alloyed steel obtained by powder metallurgy, in which the compacting gangue of the tip has been retained so as to form a strong and intimate bond between the tip,

A method of manufacture of a bar by roll-bonding of medium-alloy or high-alloy steel to mild steel involves the use of a tip composed of alloyed steel obtained by powder metallurgy, in which the compacting gangue of the tip has been retained so as to form a strong and intimate bond between the tip, the counter-tip, and the substrate.

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A method of manufacturing a roll-bonded bar, comprising producing a tip of medium-alloy or high-alloy steel powder contained within a surface envelope of mild steel, sintering said enveloped tip, securing said enveloped tip to a substrate of mild steel by weld fillets that extend along and seal betw

A method of manufacturing a roll-bonded bar, comprising producing a tip of medium-alloy or high-alloy steel powder contained within a surface envelope of mild steel, sintering said enveloped tip, securing said enveloped tip to a substrate of mild steel by weld fillets that extend along and seal between the enveloped tip and the mild steel substrate, heating the structure thus produced, and passing the structure thus produced through a rolling mill in order to subject the structure simultaneously to forcible application of the tip to the substrate and to mechanical working of the composite assembly, said weld fillets sealing the surfaces between the tip and the substrate to reduce oxidation of said surfaces.