GALVANIZED STEEL SHEET FOR HOT FORMING Russian patent published in 2016 - IPC C21D8/02 C23C2/06 C21D9/46 C22C38/38 C22C38/06 

FIELD: metallurgy.

SUBSTANCE: invention relates to production of galvanized steel sheet for hot forming. For improved sheet weldability galvanized steel sheet has chemical composition, wt%: C 0.02-0.58, Mn 0.5-3.0, solution. Al 0.005-1.0, elements, if necessary: Si equal to or less than 2.0, P equal to or less than 0.03, S, equal to or less than 0.004, N equal to or less than 0.01, Fe and admixtures - the rest. On the surface of steel sheet there is a coating layer and the Mn content in the section from the steel sheet boundary surface and the applied galvanic coating layer to the depth of 5 mcm is equal to or more than 0.3 wt%. Galvanic coating applied layer has specific weight of 40-110 g/m² and comprises Al with concentration, equal to or less than 0.5 wt%, and specific content in the galvanic coating layer, equal to or more than 150 mg/m².

EFFECT: then galvanized steel sheet is subjected to hot forming at heating temperature of 700 °C or higher.

17 cl, 2 tbl