Method for manufacturing a body featuring very high mechanical properties, formed by drawing from a rolled steel sheet, in particular hot rolled and coated sheet

摘要

The process of making a steel component from a hot-rolled steel strip by pressing, comprises cutting the sheet to obtain a sheet blank, subjecting the coated sheet blank to high temperature to form a component in heat, carrying out pressing of the sheet blank to obtain the component, preparing an intermetallic alloy compound on surface before or after pressing, providing protection against corrosion and decarburization of steel, and cooling the formed component to provide the mechanical characteristics of high hardness to the steel and high surface hardness to the coating. The process of making a steel component from a hot-rolled steel strip by pressing, comprises cutting the sheet to obtain a sheet blank, subjecting the coated sheet blank to high temperature to form a component in heat, carrying out pressing of the sheet blank to obtain the component, preparing an intermetallic alloy compound on surface before or after pressing, providing protection against corrosion and decarburization of steel, cooling the formed component to provide the mechanical characteristics of high hardness to the steel and high surface hardness to the coating, and removing by cutting the excess sheet necessary for the pressing operation. The intermetallic compound provides a lubrication function. The coated sheet is subjected to a high temperature of greater than 700[deg] C prior to heat treatment. The component obtained by pressing is cooled for undergoing hardening at a speed greater than the hardening critical speed.