Extruder housing for double-screw extruder having an annularly stepped internal bore covered by a hot isostatically-pressed structure, and method of making same

摘要

An extruder housing is formed for a double-worm or double- screw extruder by providing a steel body with a seamless one-piece structure and hot-isostatically pressing the body and the powder- metallurgical wear- resistant material lining the preferably conical bores of the housing to form a wear-resistant layer which is bonded to the steel body by a diffusion layer.