GB930419A - Method of making composite metal plates - Google Patents

Abstract

930,419. Making composite plate; Jointing by rolling. YAWATA IRON & STEEL CO. Ltd. Oct. 6, 1959 [Oct. 29, 1958; Aug. 8, 1959], No. 33899/59. Classes 83 (2) and 83 (4). In a method of cladding a base metal, e.g. mild steel manganese steel or molybdenum steel with another metal, e.g. Cr-stainless steel, Ni-Cr-stainless steel semi-killed high carbon steel or a non-ferrous metal, the joining surfaces of the metal compcn ents are electroplated with iron, nickel, cobalt copper titanium or an ironnickel alloy and 5-45 g. per sq. m. of exposed surface area of an oxygen and nitrogen consuming agent selected from aluminium, calcium, manganese magnesium, silicon, titanium, vanadium iron or an alloy of one of the latter metals such as ferromanganese is included in the sealed assembly in powder or granular form so that on heating the assembly oxides and nitrides do not form at the interface of the components. A stainless-steel sheet 2 and a mild steel base metal 1 are cleaned and the faces to be joined are electroplated with iron prior to assembly with a mild steel cover sheet 8 and mild steel spacers 3. A separating agent is included between the cover sheet 8 and the sheet 2. The deoxidizing or denitriding agent is included in a gap 7 of the assembly and the latter is secured by welding while under pressure. The assembly is then heated and rolled and the cover sheet 8 finally removed. The deoxidizing and denitriding agent may also be added to the separating agent between the cladding metal and the cover sheet. Two assemblies may be rolled together using spacers which extend between the two base sheets, the separating material being included between the two cladding sheets. Detailed compositions of the deoxidizing and dinitriding agent are given in the case of aluminium and ferromanganese and it is stated that chips of magnesium may be used in a capsule of pure aluminium.