METHOD FOR MAKING ROLLED CAST IRON SHEETS Russian patent published in 1999 - IPC

FIELD: rolled stock production, namely manufacture of hot rolled sheets, bands, strips of cast iron with spheroidal graphite. SUBSTANCE: method comprises steps of heating blank of cast iron with spheroidal graphite until 750 C - 1100 C, performing its multiple lengthwise rolling at reduction in each pass equal to (8-55)% and terminating rolling at temperature 720 C - 950 C. In variants after first five passes blank is turned in rolling plane by angle equal to 90 degrees and then it is rolled to final thickness. After completion of rolling procedure rolled sheet is subjected to heat treatment at heating it until temperature equal to Ar3 + (50-280)C and soaking it at such temperature for 0.4-48 hours. EFFECT: enhanced set of mechanical properties, increased corrosion resistance, less loss of yield. 3 cl, 2 tbl