Which is better carbon steel or aluminum alloy?

Which is better, carbon steel or aluminum alloy?
Carbon steel and aluminum alloy each have their own advantages, and which material is better depends on the specific application scenario and needs. 
Advantages of carbon steel:

It has high strength and hardness and is suitable for situations where it can withstand large forces.

It has good wear resistance and is suitable for manufacturing occasions that require wear resistance, such as cutting tools, bearings, etc.

The low cost makes it an affordable option.

*Advantages of aluminum alloy:

Lightweight, lighter than carbon steel, suitable for applications where weight reduction is required, such as aerospace, bicycles, etc.

It has good corrosion resistance and oxidation resistance and is suitable for use in outdoor environments and humid environments.

Good thermal conductivity, suitable for applications requiring heat dissipation.

*Summarize:

For applications that require high strength and wear resistance, such as manufacturing knives, machine parts, etc., carbon steel is a better choice. For applications that require lightweight, corrosion resistance or good thermal and electrical conductivity, such as aerospace, bicycles, outdoor equipment, etc., aluminum alloys have more advantages. When selecting materials, weigh them against specific usage requirements and conditions.