Ductile cast iron slag defect causes are:
1. Silicon oxide is also a main component of slag, thus reducing
silicon content as much as possible.
2. Iron sulfide in the liquid is ductile iron pieces of one of
the main reasons for forming slag defects. The low melting point
than the melting point of iron sulfide liquid, the liquid iron
in solidification process, will precipitate from molten iron
sulfide, increases the viscosity of liquid iron, the iron liquid
slag or metal oxides in the not easy to rise. Thus high sulfur
content in liquid iron, castings are prone to slag. Nodular cast
iron original iron liquid sulfur content should be controlled
under 0 06%, when it was 0 09% ~ 0 135%, iron slag defects will
3. Magnesium: research in recent years that slag is mainly due
to the magnesium, and rare earth elements such as oxidation,
therefore should not be too high residual magnesium and rare
4. System, gating system design should be reasonable, with
functions of slag, can smoothly filling mold, the metal liquid
to avoid splash and turbulent flow.
5. Temperature: when pouring temperature is too low, the liquid
metal of metal oxides by metal liquid viscosity is too high, not
easy to rise to the surface and the liquid metal residue in the;
Slag on the surface of the liquid metal temperature is too high,
too thin, not easy since the removal of liquid surface, often
with the liquid metal flow into the model. And in the
production, the pouring temperature is too low is one of the
primary causes of slag. In addition, the selection of pouring
temperature should also be considered carbon and silicon content
of the relationship.
6. If the sand surface adhesion have extra sand or coating, they
can be with metal oxide synthesis in the liquid slag, lead to
slag; Sand mold with uneven density, compactness and low type of
wall surface is liable to be metal erosion and formation of low
melting point compounds, resulting in casting slag.
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