Casting and Mechanical Works (Semenov, Russia):

Sluzov P. A., Head of technological Bureau
Sedunov V. K., General Director

Nizhniy Novgorod Dtate Technical University (Nizhniy Novgorod, Russia):

Korovin V. A., Dr. Eng., Ass. Prof., Prof.
Leushin I. O., Dr. Eng., Prof, Head of the Chair “Metallurgical Technologies and Equipment”

Е-mail (common): mto@nntu.nnov.ru

At present time, no one of the casting structural materials can be compared with high-strength iron, meaning diversity of its technical application. It should be mentioned that high-strength iron with spheroidal graphite has several features, in spite of its high technological properties. It was found out that usage of the new method for modifier introduction as powder wire can be considered as the most prospective direction of iron spheroidizing treatment. The article is devoted to study of technological features of melt modifi cation by powder wire. Investigations have been undertaken in the casting shop of Casting and Mechanical Works in Semenov, Nizhniy Novgorod region. The results of experimental works aimed on production of high-strength iron from synthetic one in small ladles (up to 200 kg) are presented. Chemical composition, processing temperature, amount of modifier and mechanical properties are examined and compared. Relationship between iron strength and amount of modifier, depending on conditions of melt treatment with/without spheroidizing, is displayed. Additionally, the paper considers efficiency of pre-spheroidizing treatment of iron melt by carbonates. It is shown that treatment in optimal modification conditions (melt preparation and spheroidizing treatment with proposed parameters) allows to rise essentially mechanical properties and to provide stability of modification effect with simultaneous decrease of consumption of magnesium alloying composition presented by powder wire.

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