The paper introduces the multiple 2 nd degree correlations between the hardness of the brake shoes used by the rolling stock and the content of carbon, phosphorus and sulphur of the phosphorous cast iron they are made of. The graphic correlations allow the determination of the variation limits for the independent parameters so as to range the values of the dependent parameters within a given domain.

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Abstract. The paper presents the laboratory experiments and results meant for obtaining composite materials to be used in manufacturing brake pads for the drive and driven rolling stock. Six samples of composite material have been designed and obtained; each of them has been assessed in terms of tribological behavior using a tribotester and using the friction and wear parameters. Also, determinations have been made on the influence of the material factors and of the main parameters of the work conditions upon the tribological characteristics of the samples under tests and upon the processes that are going on in the superficial strata.

Modern technology requires ever more high-quality steel and special steels, with properties corresponding to very different purposes. Because of the interdependence of the factors that determine the overall quality of the steel and those who determine the gas content, this is an issue of growing importance for the development, treatment and casting of steel. Slag plays an important part in the development phase no matter the process phase is. The influence of synthetic slags during LF treatment facility is examined based on the degree of removal of hydrogen. After processing the experimental data there has been established the optimal basicity variation on which one can determine the chemical composition of slag (CaO, SiO 2 , Al 2 O 3 , MgO) for the secondary treatment of steel. KeywordsSlag; Hydrogen; Steel; Solidification; Efficiency. Investigaciones sobre la influencia de la escoria sobre el rendimiento de eliminación del hidrógeno ResumenLa técnica moderna necesita cada vez más acero de calidad superior y aceros especiales, con propiedades adecuadas a unos propósitos muy amplios. Gracias a la interdependecia entre los factores que determinan el contenido de gases esta constituye un problema cada vez más importante para la elaboración, tratamiento y fundición de los aceros. Una gran importancia en el proceso de elaboración le corresponde a la escoria independientemente de la fase del proceso. Se analiza la influencia de la escoria sintética durante el tratamiento en la instalación LF sobre el grado de eliminación del hidrogeno. Después de procesar los datos experimentales se establecieron los campos óptimos de variación de la basicidad en base a la cual se puede determinar la composición química de la escoria (CaO, SiO 2 , Al 2 O 3 , MgO) para el tratamiento secundario del acero.