EN1A and 1018 steel are both carbon steels, but they have some differences in their chemical composition and mechanical properties.

EN1A is a low-carbon steel known for its excellent machinability and good surface finish. It has a carbon content of 0.07-0.15% and a manganese content of 0.80-1.20%. It also has larger amounts of sulphur which can improve its machinability as compared to 1018 steel. This steel grade is commonly used for making precision engineering components, such as screws and gears, and for making parts that require a good surface finish.

1018 steel, on the other hand, is a low-carbon steel that is known for its excellent formability and weldability. It has a carbon content of 0.15-0.20% and a manganese content of 0.60-0.90%. It also has small amounts of sulphur and phosphorus. This steel grade is commonly used for making structural components, such as shafts and rods, and for making parts that require good formability, such as gears and gears.

The main difference between these two steels is their mechanical properties. EN1A is known for its excellent machinability, while 1018 steel is known for its excellent formability and weldability. EN1A steel also has a higher surface finish, while 1018 steel is more suitable for welding and forming.

In general, EN1A steel is a better option for precision engineering applications that require a good surface finish, while 1018 steel is a better option for structural applications that require good formability and weldability.

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