Abstract: A method for quenching metallic workpieces in a furnace space, includes subjecting a metallic workpiece to a heat treatment process in an evacuated furnace space. Before a quenching gas or mixture is passed into the furnace space, hydrogen is supplied to the still evacuated furnace space. The amount of hydrogen supplied to the furnace space is limited so that, depending on (1) the quenching pressure, (2) the gas temperature at the end of the quenching process, and (3) the composition of the quenching gas or mixture, a hydrogen concentration below the explosive limit is reached in the quenching gas or mixture. The quenching gas or mixture contains an inert gas or a mixture of inert gases, such as nitrogen, argon and/or helium.

Abstract: A method for quenching metallic workpieces in a furnace space, includes subjecting a metallic workpiece to a heat treatment process in an evacuated furnace space. Before a quenching gas or mixture is passed into the furnace space, hydrogen is supplied to the still evacuated furnace space. The amount of hydrogen supplied to the furnace space is limited so that, depending on (1) the quenching pressure, (2) the gas temperature at the end of the quenching process, and (3) the composition of the quenching gas or mixture, a hydrogen concentration below the explosive limit is reached in the quenching gas or mixture. The quenching gas or mixture contains an inert gas or a mixture of inert gases, such as nitrogen, argon and/or helium.