C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/118, 32/76
C23C 2/06 (2006.01) C21D 9/56 (2006.01) C23C 2/02 (2006.01) C23C 2/30 (2006.01)
Patent
CA 1192101
ABSTRACT In hot-dip coating a ferrous metal strand with an aluminium/zinc alloy or like metallic coating medium, the strand is traversed from a furnace to a "galvanising" bath, through a duct terminating in a hood which dips into the bath. While the strand is in the duct and the hood it is subjected to a gaseous reducing environment. The gas consists of N2 and may have as much as 15% of hydrogen in it. The temperature of the gas may be ambient temperatre. The pressure of the gas is just great enough to establish a plenum in the duct so that it may diffuse into the hood and there be quiescent and maintained substantially constant in quantity and composition.
384117
Barrett Richard C.
Grove Malcolm R.j.
John Lysaght (australia) Limited
Rolston George A.
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