The optimal material for brake drums depends on the specific application and performance requirements. Currently, the mainstream materials are cast iron (gray cast iron or alloy cast iron) and composite materials (such as carbon ceramic). Here is a detailed analysis:
Cast Iron Material
Gray Cast Iron (HT250): Low cost, good wear resistance, suitable for ordinary passenger cars and commercial vehicles, but prone to heat fade at high temperatures.
Alloy Cast Iron: Added elements such as chromium and molybdenum improve heat resistance (operating temperature up to 500℃), suitable for heavy-duty vehicles or frequent braking scenarios.
Composite Materials
Carbon Ceramic (C/SiC): Lightweight (more than 50% lighter than cast iron), high temperature resistant (>1000℃), but extremely expensive, mostly used in high-performance sports cars or racing cars.
