An experimental study has been performed at CRM with impinging burners to heat
quickly low carbon steels without oxidizing their surfaces. The thermal performances
of various burners (maximum heat transfer of ~370 kW/m2 on impinged surface)
were studied and compared to data collected from classical direct flame furnaces.
Simulations permit to consider an interesting reduction of furnace size. The surface
characterization indicates the possibility to heat steel strip without oxidizing up
to 840°C. It would then be possible to anneal steel strips at higher temperature
than it is actually performed in the direct flame furnaces.