Steel 1018, Steel 1215, and Steel A36 are all steel alloys that are commonly used in CNC machining. Each of these steel alloys has its own unique properties and characteristics, making them suitable for different applications.

Steel 1018 is a low-carbon steel alloy that is easy to machine and has good ductility. It is often used for the production of parts that require a high degree of formability, such as screws and gears.

Steel 1215 is a free-machining steel alloy that is commonly used in the production of parts that require a high degree of accuracy and repeatability, such as spindles and pins.

Steel A36 is a low-carbon steel alloy that is strong and durable. It is often used in the construction industry for the production of beams and other structural components.

In general, steel alloys are known for their strength and durability, making them a popular choice for the production of parts and components that will be subjected to high levels of stress or wear. However, the specific properties of each steel alloy can vary depending on the specific combination of elements that make up the alloy, as well as the manufacturing processes used to produce it.