1. Carbon Steels: Carbon steels are typically divided into two main categories: low carbon (LC) and high carbon (HC). Low carbon steels are softer and more ductile, making them easy to process and used in construction materials. High carbon steels, on the other hand, are harder and sharper, making them suitable for knife making.

2. Stainless Steels: Stainless steels are strengthened with chromium, nickel, and other alloying elements to make them corrosion-resistant. As a result, they are commonly used in applications such as kitchen utensils, surgical instruments, and maritime equipment.

3. Alloy Steels: Alloy steels are produced by adding elements like manganese, vanadium, molybdenum, etc. These steels are resistant to high temperatures and wear, making them prevalent in the automotive, construction, and industrial machinery industries.

4. Structural Steels: These steels, used in the construction sector, are known for their high strength and durability. They are used in reinforced concrete structures, bridges, and other infrastructure projects.

5. Automotive Steels: Automotive steels used in the automotive industry are valued for their lightweight, strength, and durability. They are used in the chassis and engine components of vehicles.

6. Bearing Steels: Bearing steels are a special type of steel used in industrial bearings subjected to high loads and high temperatures.

These are just a few examples, and there are many subtypes of steel with specific properties. Each type of steel is designed for a particular application or use case, and the variety of steel types used in different industries is vast.