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‘step up’: reducing steel’s carbon footprint 4 May 2020
In order to achieve the necessary strip cooling rates for today’s high strength steels, values as high as 110-120°C/sec are needed to obtain the necessary temperature drop, typically between 800 and 250°C. This requires removal of about 350KW/m2 per side of the strip. For galvanised strip which cannot be quenched by water for surface quality reasons, specific gases are used. This requires a very high heat transfer coefficient in the range of 650 to 750KW/m2²depending on the temperature of the gas used. Laboratory experiments with air and computer modelling are described.
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