COATED STEEL STRIPS, METHODS OF THEIR FABRICATION AND APPLICATION, PRESSED BILLETS MADE THEREOF, PRESSED PRODUCTS MADE THEREOF AND INDUSTRIAL PRODUCTS COMPRISING SUCH PRESSED PRODUCTS Russian patent published in 2010 - IPC C21D9/48 C21D8/02 B32B15/00 C23C22/78 C22C38/04 

FIELD: process engineering.

SUBSTANCE: invention relates to hot stamping. To improve stamping and welding properties, aluminium- or aluminium-alloy-coated steel strip is heated in preheated furnace to temperature and for time defined by ABCD region in dwg.7 at said sheet thickness exceeding 0.7 mm and smaller than or equal to 1.5 mm and defined by EFGH region in dwg.7 at said sheet thickness exceeding 1.5 mm and smaller than or equal to 3 mm. Note here that heating rate V_c in the range of 20°C to 700°C makes 4 to 12°C/s to produce heated billet. Transfer of heated billet to press tool and pressing out produced billet in press tool to obtain hot-stamped steel sheet are followed by cooling heat billet from furnace outlet temperature to 400°C at average cooling rate making at least 30°C/s. Said hot stamped sheet can be used in surface vehicles.

EFFECT: improved stamping and welding properties.

12 cl, 7 dwg, 4 ex