Quivalent la 4620
As far as I know there is no direct equivalent. D2 is probably the closest match, but D5 and D3 may also be considered equivalent depending on the application.
Equivalent of AISI 1045 is EN18. For More details, click the link. http://www.rolexmetals.com/sdp/191736/4/cp-4383676/0/Equivalent_Grades.html
ST52 - 3/ASTM A 572 Grade 50 / AISI 1524