Carbon-silicon incubater

Abstract

The present invention relates to a carbon-silicon incubater, which comprises the following materials, by mass, 15-30% of graphite particles, and 70-85% of ferrosilicon particles. With the carbon-silicon incubater of the present invention, a large amount of graphite particles can be produced in liquid iron, such that eutectic cells can be refined with the graphite particles, carbon graphitization can be promoted, and iron carbide generation can be reduced. In addition, after annealing, mechanical properties of the carbon-silicon incubater of the present invention are high, and pipe explosion rate is significantly reduced.

Description

technical field [0001] The invention relates to a carbon-silicon inoculant used for producing ductile iron pipe fittings. Background technique [0002] In the process of casting pipe fittings, heat insulating paint is sprayed on the inner surface of the mold forming the pipe fittings, and the ductile iron pipe fittings are formed by the rotation of the centrifuge. The heat insulating paint is usually called an inoculant. In the prior art, a silicon-barium inoculant is usually used to make a ductile iron pipe, and the chemical composition of the inoculant includes: silicon, barium, calcium and aluminum. Those skilled in the art generally believe that calcium and barium belong to alkaline earth metals, and calcium in them can generate oxides, sulfides, nitrides, and slagging to purify molten iron and form nuclei; barium is the most active among alkaline earth metals. Elements, reacting with oxygen can form stable compounds, and do not contain barium after solidification of ca...

AI Technical Summary

Problems solved by technology

[0003] Although silicon barium inoculant can refine graphite grains, increase strength, improve spheroidization level, reduce whitening tendency, so as to eliminate cementite and improve mechanical properties Performance and other functions, but the particle size of the existing silicon-barium inoculants is usually between 0.3-2MM, the grains are larger, there are heavier loose defects, and the cooling rate of ductile iron pipe fittings is slow, so casting nodular cast iron If the pipe fittings use silicon-barium inoculant, the loose defects of the pipe will be very obvious, and because the grains of silicon-barium inoculant are coarse, it is easy to cause slag inclusions and slag holes, which will reduce the tensile strength and elongation of ductile iron pipe fittings ; In addition, when spraying the heat-insulating inoculant, the use of the measuring hole is relatively large, and the cost is relatively high