FIELD: rolled stock production, namely process for making cold rolled strips of low carbon steels used in automobile making industry.
SUBSTANCE: method comprises steps of cold rolling of strips in rough working rolls of last stand of mill at roughness value of roll barrel Ra equal to 0.30 - 0.60 micrometers while supplying cutting fluid; coiling strip to coils; recrystallization annealing of coils in hood furnaces with shield atmosphere; cooling coils from final temperature 710°C for soaking coils at annealing till temperature 400°C and increasing cooling rate from 5 - 8°C/h in starting period of cooling till 25°C/h in final period of cooling.
EFFECT: improved quality of strip surface due to lowered contamination degree of strip surface with carbon-containing residues, absence of such strip flaw as "stripes-slip lines".
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Authors
Dates
2007-03-27—Published
2005-10-18—Filed