G3000 Cast iron brake rotor

What is a G3000 cast iron brake rotor made of

Cast iron brake rotors are made from gray cast iron. Gray iron has a graphitic misconstruction; that’s what gives it it’s gray color. The raw materials contain iron, carbon, graphite, silica and pearlite. However G3000 is a brake rotor formula that contains a higher percentage of carbon to give it added strength and sound damping qualities.

G3000 cast iron brake rotor raw materials

A G3000-qualified brake rotor contains certain raw materials that comply with industry standards. It is a high carbon mix containing:

• Carbon 3.10%-3.40%
• Silicon 1.90%-2.30%
• Manganese 0.60%-0.90%
• Sulfur Max 0.15%
• Phosphorus Max 0.15%,
For a total Carbon equivalent of 3.9%-4.15%.

Graphitic microstructure is 2.5% – 4.0% Carbon, and 1% – 3% Silicone.  Silicone acts as a graphite stabilizing element, to enable the alloy to produce graphite instead of iron carbides.

G3000 brake rotor properties

© 2019 Rick Muscoplat