Magnesium FerroSilicon

Rare earth magnesium silicon ferro alloy, commonly known in the foundry industry as a spheroidizing agent, serves one purpose: to transform flake graphite into spherical shapes.

The reason ductile iron is stronger than gray cast iron (higher strength and better toughness) is because the graphite is spherical, not flake-shaped. The key to "bending" graphite into spheres is this spheroidizing agent.

We supply spheroidizing agents with magnesium content ranging from 6% to 11% and rare earth content from 1.5% to 8%, covering all needs from ordinary ductile iron to wind power castings.

"In spheroidizing agents, magnesium is the primary component responsible for spheroidization. But why add rare earth elements? Rare earth elements offer three main benefits:

 Anti-fading: Rare earth elements extend the effective spheroidization time. After treatment with ordinary spheroidizing agents, the spheroidization effect diminishes over time as the molten iron is left to stand. Adding rare earth elements can more than double the effective time. This is especially important for large castings and castings with long pouring times.

 Purifying molten iron: Rare earth elements have a strong affinity for oxygen, sulfur, and harmful impurities (such as lead and bismuth) in molten iron, effectively drawing them out and removing them, resulting in cleaner molten iron and higher-quality castings.

 Improving graphite morphology: Rare earth elements make graphite spheres rounder, finer, and more uniform. With the same amount of molten iron, the spheroidization rate is significantly higher with the addition of rare earth elements compared to the absence of them.

Magnesium content determines spheroidization ability, while rare earth content determines anti-fading ability and purification effect. For ordinary ductile iron castings, sufficient magnesium is enough; for thick-section castings and wind power castings, rare earth elements are necessary.

1. Ordinary ductile iron parts (manhole covers, pipe fittings, agricultural machinery parts)

  Recommended grade: QRMg7HRE2

  Features: Sufficient magnesium content, moderate rare earth content, highest cost-effectiveness.

  How to use: Pour-in method; place spheroidizing agent at the bottom of the ladle, cover with a covering agent, and pour in molten iron.

2. High-strength ductile iron parts (crankshafts, connecting rods, automotive chassis parts)

  Recommended grade: QRMg8HRE3

  Features: Reasonable ratio of magnesium and rare earth elements, high spheroidization rate, good mechanical properties.

  Key requirements: These parts require high strength and fatigue life; the spheroidization rate must be consistently above level 2.

3. Thick-section ductile iron parts (wind turbine hubs, large molds, heavy machinery parts)

  Recommended grade: QRMg8HRE5 or QRMg8HRE7

  Features: High rare earth content, strong resistance to fading, guaranteed spheroidization rate in the core.

  Key requirements: Thick, large-section parts cool slowly, and ordinary spheroidizing agents are prone to degradation; therefore, high-rare-earth agents must be used.

4. High-sulfur molten iron or special processes

  Recommended grade: QRMg10HRE7

  Features: High magnesium content, which can compensate for the burn-off caused by sulfur and ensure spheroidizing effect.

Defect 1: Nodularization Fading (Insufficient nodularity in post-cast parts)

Causes: Pouring time too long, magnesium volatilizes completely; or the original molten iron has too high sulfur content.

Solutions: Change to a high rare earth grade (stronger resistance to fading); shorten the pouring time; improve the quality of the original molten iron.

Defect 2: Poor Nodularization (Nodularity rate not up to standard)

Causes: Insufficient spheroidizing agent; inadequate covering, large magnesium burn-off; treatment temperature too low.

Solutions: Increase the amount of spheroidizing agent; check if the covering agent is tightly applied; increase the treatment temperature.

Defect 3: Graphite Floating (Graphite accumulation on the upper surface of the casting)

Causes: Carbon equivalent too high; pouring temperature too high; casting wall thickness too large.

Solutions: Adjust the chemical composition; lower the pouring temperature; add trace elements (such as aluminum, titanium).

Defect 4: Porosity in the Casting

Causes: Moisture in the spheroidizing agent; high moisture content in the molding sand; poor deoxidation of the molten iron.

Solutions: Dry and store the spheroidizing agent; control the moisture content of the molding sand; strengthen deoxidation.

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