FIELD: plastic metal working, possibly secondary usage of metal.
SUBSTANCE: method comprises steps of mechanically stripping insulation from old but suitable for usage tubes and cutting tube by portions; separating cut portion of tube along seam and cutting it by troughs; unbending troughs by means of rollers and keeping them in such state for 6 - 24 hours; then straightening blank and chopping it along perimeter. In second variant cut troughs are subjected to unbending in press.
EFFECT: lowered cost of steel sheet blanks.
2 cl, 2 ex
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