DIN EN 13835:2012-04

This European Standard specifies the grades and corresponding requirements for austenitic cast irons. These requirements are specified in terms of: - graphite form and metal structure: either flake or spheroidal graphite in an austenitic matrix; - chemical composition: as given for each of the grades; - mechanical properties: measured on machined test pieces prepared from cast samples. It does not cover technical delivery conditions for iron castings, see EN 1559-1 and EN 1559-3. This European Standard classifies a range of cast irons principally used for their heat and corrosion resistance properties. These properties are obtainable from the engineering grades in this European Standard. The special purpose grades also exhibit heat and corrosion resistance properties, but are used principally for their magnetic properties, or very low expansion characteristics. The austenitic cast irons are a range of high-alloyed materials with an austenitic matrix, containing nickel, manganese and sometimes copper and chromium. Carbon is present either as graphite flakes or as spheroids. The spheroidal graphite grades have superior mechanical properties. The properties of the austenitic cast irons depend upon them having the appropriate structure and mechanical properties for the application. These properties are dependent upon the control of metal composition within the specified grades and the metal processing route. Typical applications for the various grades are given in Annex A. In this European Standard a new designation system by number, as established in EN 1560, is given. Austenitic cast iron grades can be used for pressure equipment. The permitted material grades for pressure applications and the conditions for their use are given in specific product or application standards. For the design of pressure equipment, specific design rules apply. Annex ZA gives information relating to the conformance of permitted austenitic cast iron grades to the Pressure Equipment Directive 97/23/EC. This European Standard has been prepared by Technical Committee CEN/TC 190 "Foundry technology", Working Group 8 "High alloyed cast iron", the secretariat of which is held by BSI (United Kingdom). Regarding the German collaboration, the responsible Working Committee is NA 036-00-01 AA "Gusseisenwerkstoffe" ("Cast iron materials") of the Foundry Practice Standards Committee (GINA).