What are the 4 types of alloy steel

There are many types of alloy steel, but here are four common categories:

1. Low-Alloy Steels: These steels contain a relatively low percentage of alloying elements (typically less than 8%) such as chromium, nickel, molybdenum, and manganese. They offer improved strength, toughness, and corrosion resistance compared to carbon steel. Examples include AISI 4130 and AISI 4140.

2. Medium-Alloy Steels: Medium-alloy steels have a moderate percentage of alloying elements (usually between 8% and 15%). They are often used in applications requiring higher strength and wear resistance. Examples include AISI 4340 and AISI 52100.

3. High-Alloy Steels: High-alloy steels contain a significant percentage of alloying elements (more than 15%), such as chromium, nickel, tungsten, and vanadium. These steels offer exceptional corrosion resistance, heat resistance, and mechanical properties. Examples include stainless steels (e.g., 304, 316) and tool steels (e.g., D2, M2).

4. Ultra-High-Strength Steels: These steels are specially designed for applications requiring extremely high strength and are often used in aerospace and military applications. They may have alloying elements like nickel, titanium, and aluminum. Examples include maraging steel and AerMet alloys.

These are broad categories, and there are numerous specific alloy steel compositions tailored for various applications based on the desired properties. The choice of alloy steel depends on the specific requirements of a given application, including factors like strength, corrosion resistance, heat resistance, and cost considerations.