COLD TREATMENT AS A WAY TO IMPROVE THE WEAR RESISTANCE DRILLING TOOLS MATERIAL

The results of experiments on the effect of cold treatment (extracts samples at -75 °C) on the basic mechanical properties (σ0,2, Rm, KCV, HRC) and the wear resistance of the drill steel (9255 and G41400) after quenching at different temperatures. A substantial increase in wear resistance (in 18 ÷ 26%, respectively) with a slight increase of strength (1 ÷ 1,1%) and reduction of the toughness (in 1,4 ÷ 19%) of the samples subjected to cold treatment, compared with materials undergone a conventional heat treatment. It is concluded that the cold treatment can be considered as a promising additional step of heat treatment to increase the wear resistance of steels used for the manufacture of mining tools – the peak of hydraulic hammers, drill rods, casings crowns and other mining equipment, operating in conditions of abrasive wear.

Keywords

Drill steel, cold treatment, heat treatment, wear resistance.

Issue number: 11
Year: 2016
ISBN:
UDK: 622.23.05
DOI:
Authors: Le Thanh Binh, Bolobov V. I., Yusupov G. A., Moseev M. P.

About authors: Le Thanh Binh, Graduate Student, e-mail: binhimeme@gmail.com, Bolobov V.I., Doctor of Technical Sciences, Professor, e-mail: boloboff@mail.ru, Iusupov G.A., Graduate Student, e-mail: chuma-06@bk.ru, Moseev M.P.1, Student, National Mineral Resource University «University of Mines», 199106, Saint-Petersburg, Russia.

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Mining World Russia
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