SHEET CONSTRUCTION MATERIAL Russian patent published in 1999 - IPC

FIELD: rolled stock production, possibly metallic structures in building, machine engineering and other industry branches. SUBSTANCE: sheet construction material includes in cross section boundaries of its front and back faces. Material is produced in condition of constructionally involved thickness change at shaping operations. On boundary of front and(or) back surface and(or) at least on one apex of its cross section, at least a part of line of cross section boundary is in the form of fragment of cone section of straight round cone. EFFECT: enhanced technological effectiveness at making articles of such material due to thickness change of sheet at shaping operations, lowered material consumption of articles of such material due to rational strength distribution of material in ready structure. 21 cl, 18 dwg