CLAD CORROSION RESISTANT SHEET STEEL FOR PIECES PRODUCTION BY COLD STAMPING Russian patent published in 1997 - IPC

FIELD: metallurgy, production of three-layer sheets and stripes both sides clad with corrosion resistant steels and designated for pieces production by cold stamping. SUBSTANCE: aim is to increase pieces corrosion resistance using minimum alloying members, provision of absence of tendency to aging with keeping of ductility and stamping ability and high quality of layers joining. Three-layer corrosion resistant sheet steel used for pieces production by cold stamping has main layer of low-alloyed steel and cladding layers of corrosion resistant steels. Its strength of layers adhesion is no less that strength of main layer steel. Thickness of clad layer from each side is from 30 mcm to 15 % of sheet thickness. Steel of main sheet has, mass %: carbon 0.003 - 0.03; manganese 0.10 - 0.90; silicon 0.10 - 0.80; nitrogen 0.008 - 0 006; aluminum and / or / titanium - iron - balance. In the case ratio of aluminum and / or / titanium to share of nitrogen is 5 - 35. EFFECT: increased corrosion resistance with usage of minimum alloying members. 1 cl, 1 tbl