Several steel grades are commonly used in CNC milling, each offering specific properties:  

l Mild Steel: A versatile and economical steel grade, often used for general-purpose applications. It's easy to machine and weld.  

l Medium Carbon Steel: Offers improved strength and hardness compared to mild steel, making it suitable for components that require greater durability.  

l High Carbon Steel: Provides excellent hardness and wear resistance, making it ideal for tools, dies, and other high-stress applications.  

l Alloy Steel: A broad category of steels that contain alloying elements like chromium, nickel, and molybdenum to enhance specific properties, such as corrosion resistance, high-temperature strength, and toughness.  

l Stainless Steel: Highly resistant to corrosion, making it suitable for applications exposed to harsh environments. It comes in various grades, each with different properties.