AISI 4620 is a nickel, molybdenum, manganese low alloy steel often used for carburized parts. It has a good combination of strength and toughness and can be heat treated to high strength levels.
Machinability is good, especially in the annealed or normalized conditions. In the hardened tempers it becomes increasingly more difficult to machine.
Formability is good in the annealed condition.
4620 may be welded by conventional means prior to heat treatment or carburization.
Heat to 1550 F for sufficient time to allow thorough heating and then oil quench. It is desirable to normalize the alloy at 1700 F followed by air cool, before doing the heat treatment and oil quench.
Forge at 2250 F maximum down to 1800 F.
The alloy may be hot worked at 1900 F down to 1500 F.
Cold working of this alloy in the annealed condition can be readily accomplished with conventional methods.
Anneal at 1600 F followed by slow furnace cooling.
Not applicable to this alloy.
Temper at 400 F to 1300 f depending upon strength/hardness desired. Tempering is done following the heat treatment and oil quench. Tempering at 600 F gives a strength of approximately 210 ksi while tempering at 1000 F gives approximately 135 ksi.
This alloy hardens by cold working or heat treatment. See "Heat Treatment" and "Tempering".
Specific Gravity: 7.8
Specific Heat: 0.113
Melting Point: 2590
Thermal Conductivity: 23
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