| 摘要 |
A continuous cleaning and preheating system for steel strip to be annealed prior to being coated or otherwise treated wherein controlled reducing steps are employed to remove surface contaminants from the strip, which system uses direct flame heating whereby the combustion gases from open flame burners within a closed furnace flow into and along a restricted elongated tubular zone so that the gases are in direct contact with the strip as it enters and passes through the tubular zone and the furnace in a direction countercurrent to the flow of the said gases.
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