AISI 1045 is defined as medium carbon steel which has 0.43%-0.5% Carbon.It offers good weldability, good machinability, high strength and impact properties,but low in hardenability because of lack of suitable alloying elements,but it can obtain surface hardnesses 54-60HRC after flame or induction hardening. AISI 1045 is generally supplied in the black hot forged or normalized condition,and has a tensile strength of 570 -700 MPa with surface hardness170-210HB.