Abstract: A clad metal is produced by forming a layer of a dissimilar metal powder on the surface of a base metal by cold fixing the powder to the surface under pressure, densing only the surface and a subsurface area of the layer of the dissimilar metal powder by melting and immediately solidifying in a vacuum, compressing the layer of the dissimilar metal powder together with the base metal at a temperature not higher than the solidus-line temperature of the two dissimilar metals under a pressure of not lower than 300 kgf/cm.sup.2 (or 29.4 MPa) using a hot isostatic press, and hot working the layer of the dissimilar metal powder together with the base metal.

Abstract: A method of producing clad metal comprises the steps of forming a cladding on the surface of a metal substrate by subjecting powder of a metal which is of a different type from that of the metal substrate and is selected from among Ni-base alloys, Co-base alloys, Ti-base alloys, Fe-base superalloys and stainless steels to hot isostatic pressing under a gas pressure load of not less than 300 Kg/cm.sup.2 at a temperature not higher than the solidus thereof, thereby to obtain a composite material, and elongating the composite material by hot working. Optionally the composite material is subjected to soaking or solution treatment before being subjected to hot working.

Abstract: A steel composition particularly suitable for the manufacture of electric resistance welded pipes for use in most hostile environments and able to display excellent sour resistance and high toughness. The aluminum content of the steel composition is reduced to not more than 0.005%, while from 0.006 to 0.2% in total of one or both of titanium and zirconium is used instead for steel containing 0.0005 to 0.008% Ca. The steel, apart from iron and unavoidable impurities further contains:0.01 to 0.35% C0.02 to 0.5% Si0.1 to 1.8% Mnnot more than 0.015% P, andnot more than 0.003% SCu, Ni, Cr, Mo, Nb and V may be added in appropriate amounts to enhance the steel performance.