Steel does not rust in its pure form, but it can rust when exposed to moisture and oxygen in the presence of impurities, such as iron oxide. This process, known as corrosion, can weaken the steel and compromise its structural integrity.

There are several ways to protect steel from corrosion:

1. Galvanization: One common method is to coat the steel with a layer of zinc, which acts as a barrier to protect the steel from moisture and oxygen. This process is known as galvanization.
2. Painting: Another option is to apply a coat of paint to the steel, which creates a barrier that prevents moisture and oxygen from coming into contact with the steel.
3. Cathodic protection: This method involves applying an electrical current to the steel, which creates an electrical field around the steel and helps to inhibit corrosion.
4. Corrosion inhibitors: These chemicals can be applied to the steel to create a barrier that prevents moisture and oxygen from coming into contact with the steel.

Overall, there are a number of ways to protect steel from corrosion and ensure that it does not rust.