... short aluminum bar before extrusion. parameters:dimension of the rapid heating furnace: 4", 5" , 6", 7' , 8"total length ... ,21500mm,28500mmlength of furnace:7700mm,9360mm9360mm,9360mm,12250mmlength of heating segment:3100mm,4600,4600mm,4600mm,6200mmlength of preheating segments: ... :4kw,5.5kw,5.5kw,5.5kw,5.5kwheating time:from20 to 520 degree celsius needs 30minsnumber of the heating segments:2segments, ...