MELTING: Starting from steel scrap selected to EAF, a second treatment of clearing by the method foaming slag” is added to the standard manufacture of the liquid steel.
GRANULATION: Liquid steels subdivision in several flows allows to get primary spheres at high density characterized by a minor oxidation exposure.
QUENCHING: Continues ovens with electronic management of the thermic curve at controlled atmosphere, fixes a complete hardening even in the heart of the sphere, by a balanced cooling cycle based on the granules dimension.
CRUSHING: The round shots are not crushed anymore, but they explode according to preferential directions eliminating the residual fragility point and granting the best cutting power to edges in addition to the grains solidity.
SIEVING: The use of longitudinal screens (and not circular) on which nylon thread cloths are installed, assures a final selection with extremely reduced tolerance.
STRESS RELIEVING: The thermic bend fixed for each granulometry establishes the perfection in the treatment planning.
PACKAGING: The introduction of a manual stage in the automatized cycle, allows better control on the quality of the packing of every single pallet.
PROCESS CONTROL: Its redefinition got along with the renewal of quality certification according to ISO 9002 standards (obtained in 1997), guarantees the compliance with the procedures and tracking of the final product origins.
PRIMA STEEL GRIT FOR GRANITE
|2,0||min. 80||min. 20|
|1,2||min. 99||min. 80||max. 20|
|1,0||100||min. 99||min. 80||max. 20|
|0,8||100||min. 99||min. 80||max. 20|
|0,7||100||min. 99||min. 80|
|HARDNESS HRC||63 - 66|
|MICROSTRUCTURE||Fine and homogeneous martensite|
|CHEMICAL ANALYS||C > 0,9%||P < 0,035%||S < 0,035%|