Process for producing a hot dip galvanized steel strip

摘要

A hot dip galvanized steel strip in which the zinc based alloy coating exhibits a satisfactory appearance and is firmly fixed to the strip substrate, which strip is produced by a process which comprises coating at least one surface of a steel strip with a melted zinc based alloy controlling the weight of the melted zinc based alloy coating and; solidifying the melted zinc based alloy coating and which process is characterized in that the zinc based alloy contains 0.1 to 2.0% by weight of magnesium and in at least a portion of a stage in which the melted zinc based alloy coating is still in the fluid state, the zinc based alloy coating is exposed to an oxygen-controlled atmosphere containing 1000 ppm or less of molecular oxygen, the controlling procedure for the weight of the melted zinc based alloy coating being carried out in the oxygen-controlled atmosphere.