DIN EN 4268:2012-12

This standard covers the general requirements for heat treatment facilities processing semi-finished products and parts in metallic aerospace materials. It defines the terms used herein and describes the test procedures and requirements for mandatory tests of heat treatment facilities. It also serves as an aid in the surveillance and approval of heat treatment facilities. This standard applies to all types of heat treatment facilities, including those using direct or indirect heat transfer and liquid or gaseous heating media, with our without circulation, and to vacuum furnaces. The heat treatment of metallic materials produces specific material properties only if performed within relatively narrow temperature ranges, the respective tolerances of which are specified in the applicable standards. A heat treatment facility can therefore be used for a heat-treating operation only provided its temperature variations over space and time remain within the specified temperature tolerance. Proper temperature distribution in the heat treatment facility depends on, for example, the type of furnace or bath, the heating medium, the control instruments with their feedback and run-up circuitry, and the rigging and positioning of control sensors. A suitable recording instrument is needed to properly monitor and document the heat treatment. This document (EN 4268:2012) has been prepared by ASD-STAN, Technical Section Metallic Materials, with the participation of German experts of the Aerospace Standards Committee. The responsible German standardization committee is Working Committee NA 131-01-01 AA "Stähle" ("Steels") of the Aerospace Standards Committee at DIN.