Composite sheet metal for welded pipes has low alloy steel core separated from outer layer of high-alloy steel by layer of copper or nickel

摘要

A composite material has a low-alloy steel core (1a) separated from a covering (2a) layer of high-alloy steel by an intermediate layer (2d). The intermediate layer is copper or a copper-based material, and/or nickel or a nickel-based material. The composite material is manufactured by cold roll plating.