NC11 steel, in view of the specificity of its manufacturing process, is characterised with band-like orientation of carbides. Depending
on the direction of cutting the material for the inserts out of commercially available steel products, carbide bands can be oriented
in parallel or perpendicularly to the direction in which aggregate grains move in the process of pressing stampings. It has been found that
in case of scratches made in direction perpendicular to carbide bands, depth of the scratches is less than this observed when scratches are
made in direction coinciding with prevailing orientation of carbide precipitates.
The paper presents results of assessment of the unit pressure force within the refractory material volume in the course press-moulding of
stampings for refractory precast shapes. The force was evaluated with the use of physical simulation of deformation undergone by lead
balls placed in the raw refractory mass subjected to pressing in a metal die. To determine the value of unit pressure force applied to the
aggregate grains in the course of stamping press-moulding, physical model of deformation of a sphere induced by the uniaxial stress state
was used.
The paper presents results of an analysis of material density distribution in stampings press-moulded in metal dies from raw refractory
materials based on alumina-magnesia-carbon aggregate. The stampings, fabricated on LAEIS HPF 1250 pressing machine, are blanks from
which refractory precast shapes are manufactured by means of drying and firing. Samples for material density evaluation were cut out
from test stampings with the use of diamond-reinforced disc. Density of the material was determined in thirteen layers of stampings
denoted with letters A through M.