Yes, carbon steel is susceptible to rusting if not properly cared for. Unlike stainless steel, carbon steel contains a higher amount of iron and lower levels of alloying elements, such as chromium, which provide corrosion resistance.

When exposed to moisture, carbon steel can undergo a chemical reaction known as oxidation, resulting in the formation of iron oxide, commonly referred to as rust. The presence of moisture, oxygen, and other corrosive substances can accelerate the rusting process.

The rate at which carbon steel rusts depends on several factors, including the environmental conditions, exposure to moisture, and the quality of the steel itself. High humidity, salty or acidic environments, and prolonged exposure to water can increase the likelihood and speed of rust formation on carbon steel.

To minimize rusting and maintain the condition of carbon steel, it is important to follow these preventative measures:

1. Keep the steel dry: After using or cleaning carbon steel tools or blades, ensure they are thoroughly dried before storing them. Moisture left on the surface can promote rust formation.
2. Apply a protective coating: Applying a thin layer of oil or a protective coating, such as wax or a rust inhibitor, to the surface of carbon steel can help create a barrier against moisture and oxygen, reducing the risk of rust.
3. Store in a controlled environment: Properly storing carbon steel tools or blades in a dry environment with controlled humidity levels can minimize exposure to moisture and reduce the likelihood of rust formation.
4. Regular maintenance: Periodically inspect and clean carbon steel items to remove any dirt, debris, or surface rust. Use non-abrasive materials and rust removers designed for carbon steel to preserve its appearance and prevent further rusting.

It's worth noting that a certain amount of surface patina or discoloration can develop on carbon steel over time, which is considered normal and can provide a protective layer against further corrosion. However, significant rusting should be addressed and prevented through proper care and maintenance.