Chromitsand, dessen chemische Hauptzusammensetzung Cr2O3 ist, weist eine stabile Heizleistung und eine hohe Wärmeleitfähigkeit auf. Der Sand kommt mit geschmolzenem Metall in Kontakt, ist gut beständig gegen alkalische Schlacke und reagiert nicht mit Eisenoxiden und anderen chemischen Substanzen. Außerdem weist er die Eigenschaften einer Festphasensinterung auf, wodurch das Eindringen von geschmolzenem Metall gut verhindert und Sandfehler vermieden werden können. Er ist für alle Arten von Edelstahl, legiertem Stahl und Kohlenstoffstahl geeignet und kann mit Sand und Farbe nach und nach modelliert werden.
Chromitsand ist eine spezielle Sandart für den Guss. Es handelt sich um einen natürlichen Spinell, der hauptsächlich aus Chromit besteht. Er wird zerkleinert, gemahlen und in eine bestimmte Körnung gesiebt, die sich für den Formsand (Kernherstellung) eignet.
Physikalischer und chemischer Index | ||
Artikel | Einheit | Index |
Cr2O3 | % | ≥46,0 % |
SiO2 | % | ≤ 1,0 % |
FeO | % | ≤26,5 % |
Hoch | % | ≤ 0,30 % |
MgO | % | ≤10,0 % |
Al2O3 | % | ≤15,5 % |
P | % | ≤ 0,003 % |
S | % | ≤ 0,003 % |
Cr/Fe | 1,55:1 | |
Schüttdichte | g/cm3 | 2,5-3 |
Farbe | / | Schwarz |
PH | / | 7-9 |
Die Menge der Säure | / | ≤ 2 ml |
Prozent Boden | % | ≤0,1 |
Die gesinterten | °C | 1600 |
Prozentsatz der im Sand vorhandenen freien Säure | % | 0 |
Fülldichte | g/cm3 | 2.6 |
Sinterpunkt | °C | > 1.800 |
Schmelztemperatur | °C | 2.180 |
VERPACKUNG: | 1MT großer Beutel | |
GRÖSSEN: | AFS35-40 AFS40-45 AFS45-50 AFS50-55 AFS55-60 AFS60-65 |
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