Furnaces, roller hearth, metal heat treatment, Machinery and equipment for metalworking, Metals, Machinery & Engineering, Furnaces, vacuum, metal heat treatment, Furnaces, muffle, metal heat treatment, Furnaces, malleablising, Furnaces, rapid heating, gas fired, metal heat treatment, Furnaces, chamber, metal treatment, Vessels, trays and carriers for metal heat treatment furnaces, Chargers and dischargers for metal re-heating furnaces