How to choose a high-quality foundry inoculant?

Inoculants are metallurgical materials often purchased by foundry manufacturers, mainly because inoculants can effectively reduce the content of harmful elements, but the most important thing is that inoculants can inoculate molten iron, effectively promote the formation of graphite crystals in molten iron, and effectively improve Machinability and quality of castings.

Introduction to foundry inoculants;

The block size of the foundry inoculant should ensure uniform particle size and moderate size, so as not to affect the inoculation effect, and the molten iron after inoculation should be fully stirred before slag removal;

The amount of casting inoculant added is generally controlled at 0.3%-0.6%. Do not increase the amount of inoculant blindly. Excessively high inoculant amount will increase the viscosity of molten iron and the tendency of slag inclusion, keyhole, and shrinkage;

Casting inoculant is a kind of inoculant that can promote graphitization, reduce the tendency of white mouth, improve the shape and distribution of graphite, increase the number of eutectic groups, and refine the matrix structure. Have good effect. It is mainly suitable for general or post-instantaneous pregnancy in various situations.

Foundry inoculants are mainly used in the inoculation of ductile iron and gray iron molten iron. The silicon-barium inoculant strongly increases the graphitization core, refines the graphite, promotes the A-type graphite in the gray iron casting, and improves the strength. For the ductile iron casting, it can make the graphite in the ductile iron fine and round, and improve the nodularization level. Resistant to fading while preventing the associated nodular fading. The wall thickness sensitivity is small and the tissue is uniform. Significantly reduce the whitening tendency, reduce the relative hardness, and improve the machining performance of castings. Used as an inoculant and nodulizer in the cast iron industry.

The composition index of foundry inoculant (long-acting inoculant):

Ba: 1-2%, Ca 1-2%, Si 70-72%, Al 1-2%

Ba: 4-6%, Ca 1-2%, Si 65-70%, Al 1-2%

Ba: 2%-5%, Ca: about 1.5%, Si: 68%-72%

Foundry inoculant supply granularity:

0-0.25mm: used for inoculation in the mold (precise inoculation, higher efficiency)

0.2-1mm: used for inoculation with flow (the control of inoculation amount is more accurate)

1-3mm, 3-8mm are used for inoculation in the bag (the inoculation time must be controlled at more than 70% of the tapping time)

8-15mm for inoculation in furnace