KOTAR
Kotar is the result of our long term experience and detailed R&D studies. As we all know, one of the most important element of shotblasting process is hardness. Keeping that in mind, we primarily led our R&D studies on finding how we can increase our actual hardness level without comprimising our product quality. As a result, Kotar has been developed with higher hardness compared to standard low carbon steel shot while maintaining its strong side of not breaking during the whole shotblasting process. Its longer lifetime has been proved firstly in our test center and onsite through different shotblasting processes applied by our customers. Onsite experiences showed us that higher hardness levels greatly contribute to shorter shotblasting times.
When produced, Kotar steel shot has 43 – 44 HRC initial hardness and this level reaches up to 49 – 50 HRC during the use due to manganese as well as contribution of other elements which is maintained until shot becomes unusable.
Next priority considered during the R&D studies of Kotar was to have a working mix that does not change for a long time in order to have a more effective cleaning. Especially in foundries, parts with different sizes and shapes are usually shotblasted in the same machine using the same size steel shot. Kotar sizes are arranged based on new sieve distribution in accordance with SAE standards. Each Kotar size covers more area on the part by activating at least 30% more shot particles in unit time and volume. That guarantees both better cleaning of parts with different sizes and shapes as well as a working mix that keeps its distribution for a longer period.
WHAT IS KOTAR?
Kotar steel shot offers a very long lifetime without breaking thanks to its bainitic microstructure. Produced at high initial hardness level (43-44 HRC) Kotar transfers high energy on the surface shotblasted which makes it work faster than competitor products.
Our experience says that steel shot with customary sieve distribution is hardly cleaning the pieces with complex shape and angles. However, Kotar features a fine tuned sieve distribution aiming the best coverage in order to achieve required surface quality in short blasting time.
Due to its low carbon, hig manganese content, Kotar reaches up to 46-49 HRC hardness levels in very short time during shotblasting. Kotar is initially prepared with the working mix desired to be inside shotblasting machine and the same working mix remains unchanged during operation. Increased hardness in short period and working mix kept unchanged are essential advantages which leads to continuing surface quality.
Proudly presented by Toscelik Granul, Kotar steel shot performs very well in corrosion, oxidation, sand removal, deburring, surface preparation and shot peening operations thanks to its long lifetime and high hardness level. Kotar is appropriate to be used in foundries, steel shops, forging, rolling mills, machinery and steel production, automotive, aircraft and structural steel industries.
During shotblasting, low carbon steel shot does not break in parts but instead, shot particles are peeled off similar to thin onion layers up to 80% of their lives as a result of material fatigue. Since Kotar shot particles are not broken in big parts, inner linen of shotblasting machine and turbine parts are less damaged. We are conducting comparison tests against competitor products and see the condition of our product frequently not to compromise on these benefits. Shotblasting machine in our test center gives us the opportunity to make trials under industrial conditions.
Hardness
TOSÇELİK LOW CARBON STEEL SHOT is subject to hardness testing that requires at least 90% of the shot sample falling within the range of 43-44 HRC.
Density
Density must be 7.0 g / cm3 minimum
Microstructure
As a result of the bainitic microstructure, Tosçelik Low Carbon Steel Shot has a higher level of hardness and greater service life.
General Look
Steel Shot is required to be in a spherical form as much as possible. Extended or compound particles, tails, hollows, broken pieces, shrinkage, slag and dirt have to be at a minimum level.
Applications
Sectors
Steel shot is mainly used in foundries, steel mills, forging shops, rolling mills, machine shops, structural steel mills that are serving automotive, construction, ship building, aerospace, agriculture and many other industries.
Applications
Sand Removal, Deburring, Descaling, Oxide Removal, Surface Treatment, Stress Relieving, Shot Peening.