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Development of metallurgy in Russia and CIS
ArticleName Providing of cold resistance of high-duty castings from high-strength cast iron
ArticleAuthor A. M. Timofeev, I. O. Leushin, Yu. A. Zinovyev.

Gorkovsky Automotive Plant (GAZ), Nizhny Novgorod, Russia

A. N. Timofeev, Engineer


Nizhny Novgorod State Technical University named after R. E. Alekseev, Nizhny Novgorod, Russia

I. O. Leushin, Doctor of Engineering Sciences, Professor, Head of the Chair of Casting and Metallurgical Processes and Technologies,

Yu. A. Zinovyev, Candidate of Engineering Sciences, Assistant Professor, Chair of Casting and Metallurgical Processes and Technologies


The combined influence of complex modifier and micro-addition of boron on the properties of castings of high-strength iron was researched, especially, their influence on toughness values in the area of working negative temperatures. The paper presents solving of the announced problem applying to cast billets of valves and fittings as well as components for railroads. These products are manufactured at GAZ metallurgical production facilities and intended for operation in the Far North conditions at working temperatures about - 80 ºC. During experimental examinations, technological restrictions for content of silicon, manganese and phosphorus in cold-resistant iron were determined. The samples were taken from 24 pilot melts, and these samples have been cooled and tested for impact strength in accordance with GOST 9454-78 standard. Cast iron microstructure was investigated for boron content in the range between 0.003 % and 0.01 %. The optimal amount of injected boron located within the 0.005 - 0.007 % was established; it allowed, using flexibility and versatility of the technical scheme of in-mold inoculation, to solve the problem of ensuring the necessary level of cold resistance of castings of high-strength iron. It was also shown that micro-additions of boron have effect on size and distribution of graphite inclusions.

keywords Cold resistance, toughness, high-strength iron, boron, castings, boron microalloying, in-mold inoculation, negative temperature, microstructure

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