AISI 1018 carbon steel is a free machining grade that is the most commonly available grade around the world. Although its mechanical properties are not very unique, it still can be easily formed, machined, welded and fabricated.
There are many different categories of steel, and carbon steels are one such category that contains 0.12 to 2% carbon in them. The steel gains hardness and strength with heat treatment when the carbon percentage content increases; however its ductility is reduced.
|UNS DesignationA||Grade||Heat Chemical Ranges and Limits, %|
|C||Mn||P, max||S, maxB||Pb|
|Tensile strength||440 MPa||63800 psi|
|Yield strength||370 MPa||53700 psi|
|Modulus of elasticity||205 GPa||29700 ksi|
|Shear modulus (typical for steel)||80 GPa||11600 ksi|
|Elongation at break (in 50 mm)||15%||15%|
|Hardness, Knoop (converted from Brinell hardness)||145||145|
|Hardness, Rockwell B (converted from Brinell hardness)||71||71|
|Hardness, Vickers (converted from Brinell hardness)||131||131|
|Machinability (based on AISI 1212 steel. as 100 machinability)||70||70|