Scrap shredding

The Electric Arc Furnaces in Steel Plants use ferrous
scrap among other raw materials. This ferrous scrap
has to be shredded before feeding the EAF. There are
two main components in the scrap shredder: discs
and hammers between the discs. The scrap is fed from
a conveyor belt so these discs are exposed to impact
and considerable pressure onto their surfaces exerted
by contaminated scrap.
In M&R, it is not always possible to carry out a proper
preparation of the welding surface and edges, to select
the more comfortable welding position or properly
clean the surface. These conditioning factors were
found when rebuilding the rotor’s discs in this scrap
shredding machine. In this case, the biggest difficulty
was to clean the surface from a thick layer of dust
and to have a regular profile without the previously
damaged hardfacing.
Based on these preliminary conditions, the wear
phenomena affecting the discs and our know-how,
EnDOtec DO*05 was selected as a buffer layer and
TeroMatec 4923 as a hard layer.
DO*05 has been successful in many other applications
as buffer layer without any porosity and cracks.
TeroMatec 4923 has resulted in a well bonded surface
resistant against impact, pressure and abrasion.
The previous solution lifetime was 2 days and we
achieved 3 weeks with our solution.