Design of tribological properties of G200CrNiMo4-3-3 cast steel by heat treatment

摘要

The so-called adamite cast steels are often applied in metal-forming industry for producing working metallurgical rolls [1-4]. Ledeburitic cast steel G200CrNiMo4-3-3 can serve as an example of such steels (according to previously used markings: L200HNM). Observations of a wear mechanism of metallurgical rolls made of this cast steel indicate its high abrasion and heat fatigue resistance [1,5,6]. It is essential, in so far as such metallurgical rolls are produced by the Polish producers. Modification of this material microstructure by means of heat treatments allowed to improve its strength properties and a crack resistance [7-10]. One of the variants of heat treatment influencing the mentioned above parameters is under-annealing normalising [11, 12]. It was suggested in paper [11] that the microstructure obtained by under-annealing normalising should improve also tribological properties of this cast steel. This was also confirmed by the results presented in papers [13,14]. However, those papers concern solely either an analysis of wearing mechanism [13], or a degree of wear [14], or a short duration time (400 s) of the tribological test [15].