Nowadays, there are many kinds of inoculants for cast iron treatment on the market, but the most common ones are those containing barium, silicon, strontium, barium silicon and rare earth alloys. Today, we have invited the staff of inheritance casting to tell us about these three common inoculants.
Ba-containing inoculant has a strong ability to promote graphitization, which can improve the morphology and distribution of graphite in thin-walled castings。 Moreover, it can delay the role of breeding recession, and it does not need to be added too much when dealing with it。 If it is added too much, it may be counterproductive。
The common inoculant containing silicon is 75 ferrosilicon。 The content of calcium and aluminium plays an important role in the inoculation effect。 It has been reported that ferrosilicon without calcium and aluminium has little or no effect on the inoculation of gray cast iron。
The strontium-containing inoculator has a strong ability to eliminate the whiteness. It is obvious that it is helpful to improve the morphology and distribution of graphite in thin-walled gradually. The supercooled structure can only be seen on the surface of the castings.
The inoculant containing silicon-barium alloy has a better ability to reduce the whiteness tendency of cast iron, and can increase the inoculation effect to about 30 minutes。 It is suitable for large castings。 When the alloy is treated, 0。1% can be added。
The effect of inoculant containing rare earth is better in these kinds。 The effect of adding proper rare earth inoculant in inoculation can be several times better than that of 75 ferrosilicon。 The effect of eliminating whiteness is obvious, and the decline of inoculation effect is slowed down。 However, the amount of inoculant should be paid attention to in addition。 If more rare earth inoculant is added, there will be cementite structure when cast iron crystallizes。 Appear。
To learn more about inoculants, please visit our website: www.szgcgd.com.