Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

G. S. Gun, Dr. Eng., Prof., Rector Advisor
K. G. Pivovarova, Cand. Eng., Associate Prof., Dept. of Material Processing Technologies, e-mail: k.pivovarova@magtu.ru

“MMK-METIZ” OJSC (Magnitogorsk, Russia):

N. V. Tokareva, Head of Metallographic Lab, Central Plant Laboratory

A. A. Sokolov, Chief Specialist on Research Works, Central Plant Laboratory

K. A. Antoshkina participated in this research.

Material of automotive spark plug shell was investigated in order to determine the causes of “orange peel” defect appearance in cold forging. It was established that structure of cold-drawn steel C10C with heterogeneous structure and ferrite grain size 3–8 points is the cause of this defect forming. It is shown that annealing after drawing with critical deformation degree 15% leads to forming of coarse ferrite grain (3 points) and heterogeneous grain structure. To eliminate “orange peel” defect, it is necessary to manufacture a billet with homogeneous structure and ferrite grain size 7–8 points. The experiment with choosing of drawing and heat treatment conditions was conducted for obtaining of preset structure. Critical points of C10C steel were determined. Technological solutions providing improvement of microstructure homogeneity of colddrawn steel and excluding “orange peel” defect forming on the surface were developed and put into practice.

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