Controlled Cooling in or After Batch Furnaces

Maintain a leak-tight furnace, with minimal opening of door and peep sights 

Use an automatic furnace pressure control with the setpoint at -t-0.02 wc (0.05 mm water gauge) to prevent air inflow 

Use a quality air/fuel ratio controller set as close to stoichiometric as practical, but erring on the oxidizing side (because dross is easier to remove than absorbed hydrogen) 

Avoid flame or hot poc impinging directly on the molten bath surface 

Do not use a liquid metal circulating device that sucks in air or poc along with the metal 

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