Abstract: A plant for chromizing metal articles, comprising: a furnace mounted on a framework tiltably about its transverse axis. Set up lengthwise within the furnace and rotatably about its longitudinal axis is a retort with two chambers and an appliance adapted to preclude the arbitrary pouring over of granular chromium-containing material from one chamber into another.One of the chambers is fitted with a tube for supplying gas therein and another one with a reagent-supply tube and with a tube for discharging reaction products or feeding gas.Said appliance comprises a screw secured in a retort throat and a partition arranged in front of the screw on the side of the working chamber and fitted with holes sufficient for the grains of the chromium-containing material to pass through but insufficient for the passage of articles.Chromizing apparatus includes a horizontal mounted retort which is rotatable about its longitudinal axis, pivotal about its transverse axis and has a working chamber and an auxiliary chamber.