Patent ID: 9194034
Filing Date: 2015-11-24
Classification: C21D,C22C,C23C

Abstract:
1. A method, comprising: heating a pre-coated plate of steel to a temperature of 700° C. to 950° C. in a furnace to form an intermetallic alloying layer on the plate at least in an area thereof; pretreating air through drying to produce dried air having a dew point adjusted to a value of −70° C. to +10° C.; heating the dried air before being fed to the furnace to a temperature from 100° C. to 700° C., feeding dried air into the furnace under pressure above atmospheric to control an atmosphere within the furnace while the pre-coated plate is in the furnace; and wherein the dried air is fed to the furnace with the pressure of the dried air being adjusted to a value between the atmospheric pressure and 8 bar inclusive.