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life and hardness compared with<br />
high-carbon steel shot. Thanks to<br />
the minimum carbon content (0.10%)<br />
provided by the chemical structure<br />
of our KOTAR products, the fact that<br />
our products emit minimum carbon<br />
both during the usage phase and during<br />
the evaluation process as waste<br />
after use is an indicator of our responsibility<br />
towards the environment<br />
and nature.<br />
While the standard low-carbon steel<br />
shot has a hardness value of 39-41<br />
HRC before use, our KOTAR product<br />
starts the shotblasting operation with<br />
43-44 HRC hardness value and reaches<br />
49-50 HRC hardness value in a<br />
very short time in operation conditions<br />
thanks to its special chemical<br />
content. This makes KOTAR products<br />
more durable,strong and effective.<br />
Another aim of our KOTAR product<br />
was to make the sieve distribution,<br />
which is generally concentrated<br />
on a single sieve size, more homogeneous<br />
in the sieve distribution<br />
specified in the SAE standard. In this<br />
way, we aimed to present a product<br />
distribution similar to the product<br />
mix used in the machine, ready to<br />
use, to the customer. When adding<br />
new products to the machine, the<br />
fact that the product used in the<br />
machine and the newly added product<br />
have a similar sieve structure<br />
ensures that a standard is achieved<br />
on the surfaces obtained. In addition,<br />
the homogeneity of the product<br />
distribution instead of concentrating<br />
on a single sieve size facilitates the<br />
shotblasting of the parts with complex<br />
geometry to the desired extent.<br />
While eliminating the need for second<br />
shotblasting, this homogeneity<br />
of KOTAR distribution meets some<br />
of our customer needs by making<br />
markings and product codes more<br />
visible.<br />
It is known that high-carbon steel<br />
shot break down quickly and disproportionately<br />
due to their brittle<br />
structure, thus can damage machinery<br />
and spare parts. Disproportionate<br />
and angular fragmentation<br />
adversely affects the surfaces inside<br />
the machine, apart from the surface<br />
of the blasted part. Having to<br />
renew the internal parts of the shot<br />
blasting machine and turbine spare<br />
parts more often means extra costs,<br />
and irregular stops may arise.<br />
As KOTAR shot hit the surface<br />
of the part during the blasting process,<br />
they shrink in thin layers like<br />
onions for 80% of their life, keeping<br />
their spherical shape. This feature<br />
makes our KOTAR products more<br />
prominent than other competitors in<br />
the market. The fact that it shrinks<br />
without breaking like a high-carbon<br />
steel shot prolongs the life of the<br />
machine and its spare parts.<br />
KOTAR, proudly presented to<br />
the whole world by Tosçelik Granül,<br />
shows excellent performance in rust,<br />
oxide and sand removal processes,<br />
burr removal and surface preparation<br />
processes with its long service<br />
life and high hardness. Ideal for use<br />
in foundries, steel mills, forging and<br />
rolling mills, machine building, steel<br />
industry, automotive, shipbuilding,<br />
aircraft and structural steel industries.<br />
TURKCAST Special Issue 25