Steel is a popular material for CNC milling due to its numerous advantages:  

• Strength and Durability:Steel offers exceptional strength and durability, making it ideal for applications that require high load-bearing capacity and resistance to wear and tear.  
• Versatility:Steel can be machined into a wide range of shapes and sizes, from simple to complex geometries. It's suitable for various industries, including automotive, aerospace, medical, and manufacturing.  
• Machinability: While steel can be more challenging to machine than some other materials, advancements in CNC technology and cutting tool materials have significantly improved its machinability.
• Heat Treatment: Steel can be heat-treated to enhance its mechanical properties, such as hardness, strength, and toughness, to meet specific performance requirements.  
• Cost-Effectiveness: While steel may have a higher initial cost compared to some other materials, its durability and longevity often lead to lower long-term costs.