an elongated metal product, manufactured by extrusion through a die. Extruded sections may be solid or hollow and may have constant or variable cross section.
Aluminum-alloy sections are the most common; in the USSR there are about 15,000 items in this group. Industrial production of extruded steel and titanium sections has been mastered. There are more than 1,000 items in this group. In addition, extruded sections are manufactured from magnesium, copper, and nickel alloys.
Extrusion of sections has a number of advantages over rolling: the possibility of processing materials of low plasticity, a more complex configuration of the cross section, smaller deviations from nominal dimensions, and lower expenditures for tooling and retooling during changeovers from one size to another. Extruded sections are used in the manufacture of structural components in machine building, aircraft construction, and shipbuilding and railroad and motor-vehicle transportation; supporting and finishing elements in the construction industry; and furniture and sports equipment.
M. Z. ERMANOK