HIGH-STRENGTH FLEXURE-TOLERABLE MATERIAL Russian patent published in 2012 - IPC B21B1/22 

FIELD: process engineering.

SUBSTANCE: rolled billets are produced from melt containing 0.3-1.5% Si, ≤0.5% Fe, ≤0.3% Cu, 1.0-2.0% Mn, ≤0.5% Mg, ≤4.0% Zn, ≤0,3% of every element selected from the groups IVb, Vb or Vib, and unavoidable impurity elements. Note here that, prior to rolling, billets are preheated at temperature lower than 550°C, preferably 400 to 520°C, and more preferably, 450 to 520°C, to adjust disperse particle size and quantity. Then, preheated billet is hot-rolled into hot strip. Said strip is then cold rolled with full reduction of, at least 90%. Cold-rolled strip is subjected to heat treatment to reach 0.2% of conventional yield point that makes 50-90% of yield point in cold-rolled state to conventional yield point of 100-200 MPa.

EFFECT: high strength, stability, resistance to flexure, better processability.

53 cl, 2 dwg, 5 ex, 3 tbl