Inoculant Basi Size 1-3mm Foundry is a biopreparat that contains live azotofiksuiuchimi bakterii (Bradyrhizobium japonicum 532C) in sterile powder. It is a highly effective inoculant for legumes.
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The inoculant according to the present invention is able to significantly limit et even éviter the formation of metallurgical defects in the cast iron. This is particularly true for the cases in which the cast iron is subjected to a pre-conditioning treatment as well as when it is used as a nodulant.
During the melting process, the inoculant increases the number of nucleation sites available and favors formation of graphite rather than iron carbide. It also minimizes undercooling of the melt below the metastable eutectic temperature and thus prevents formation of cementite.
The reference fonderie (G1) and the test (G2) using the inoculant alloy were carried out in accordance with Example 4 and Foundry D by inoculating massive pieces. The inoculant can be added either in the slag or directly in the casting mold, and its dosage is adaptable depending on the modalities of addition. It can also include additional elements delivering particular effects depending on the desired properties.
L’inoculant peut également comprendre des elements additionnels apportant des effets particuliers selon les recherches propres. Cela peut être plusparticulièrement le cas dans la contexte d’une treatment de pre-conditionnement du fondage.
During the present invention, a nodulising treatment is performed using an inoculant alloy. The inoculant alloy according to the invention consists of a mixture of ferrosilicium, antimony, calcium silicide and rare earths. It also contains a cored wire. It exhibits great stability of the granulometry of the grains under certain conditions. This is in contrast to the products described in documents FR251 1044A1 and EP081 6522A1 which suffer from a deterioration of the granulometry of the agglomerates over time during stockage.
The melt then undergoes an additional inoculation treatment based on a late inoculation method by adding 0.17 % of an FeSiMnZr alloy having a granulometry of between 0.2 and 5 mm. The inoculant is subsequently used to inoculate the cast iron. It can also be used in the pre-conditioning of the cast iron as well as as a noduliser.
The inoculant may also include additional elements providing particular effects, depending on the desired properties. This can be particularly the case in the context of a pre-conditioning treatment of the cast iron.
The reference and test fonderies (G1 and G2) have been carried out using an inoculant alloy according to the invention, which is characterized by its inclusion of magnesium. The alloy has been added before casting in the slack, with a granulometry of between approximately 0.2 and about 2 mm.
The addition of the inoculant has allowed the elaboration of a shade of EN-GJS-400-18-LT darkening, used in particular in the wind energy sector. It has also made it possible to increase the resistance of the cast iron to shocks significantly. The use of the inoculant has also permitted a significant improvement of the quality of the graphite formed, whether it be spheroidal or vermicular. The inoculant can be added before the casting process or after, by a late inoculation method.
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