Abstract
The results of studies on the use of magnesium alloy in modern Tundish + Cored Wire injection method for production of vermicular graphite cast irons were described. The injection of Mg Cored Wire length is a treatment method which can be used to process iron melted in an electric induction furnace. This paper describes the results of using a high-magnesium ferrosilicon alloy in cored wire for the production of vermicular graphite cast irons at the; Tundish + Cored Wire to be injected methods (PE) for pearlitic-ferritic matrix GJV with about 25 %ferrite content. The results of calculations and experiments have indicated the length of the Cored Wire to be injected basing on the initial sulfur content and weight of the treated melt. The paper presents a microstructure matrix and vermicular graphite in standard sample and different walled castings. The results of numerous trials have shown that the magnesium Tundish + PE Method process can produce high quality vermicular graphite irons under the specific industrial conditions of the above mentioned foundries.
Highlights
The compacted/vermicular graphite as a new engineering materials has already been widely used
The currently available standards are summarized in Table 1; GJV cast iron has been known by the names “Compacted Graphite
Iron” and “Vermicular Graphite Cast Iron”, with the Compacted terminology primarily being used in English speaking countries and Vermicular- predominating in most other languages
Summary
The compacted/vermicular graphite as a new engineering materials has already been widely used. Vermicular graphite iron (GJV) has existed for more than 25 years, its applications have been limited to simple, lowvolume components with wide microstructural tolerances, pump housings, brackets, box, car engine blocks, etc. Cast iron with vermicular graphite is included in ISO 16112 international standard from 2006 was published using the combined name: “Compacted (Vermicular) Graphite Cast Iron”. The ISO 16112 standard designation for CGI has been abbreviated as “ GJV” and five Grades have been specified in separately cast test pieces, including: minimum values of UTS - MPa GJV-300 (ferritic) GJV- 350, GJV-400, GJV- 450 (pearlitic) and GJV-500 (alloyed). Whereas the customer specifications referred to above can demand up to 50% of nodules present, the new and as-yet unpublished ISO standard requires a general limit of 25 %. It can be deduced that GJV requires far greater control than ductile iron
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