4340 VAR is a chromium nickel molybdenum alloy. It is used at a variety of strength levels and at each level possesses remarkable ductility and toughness. With its high alloy content uniform hardness is developed by heat treatment in relatively heavy sections. High fatigue strength makes it ideal for highly stressed parts. It maintains its strength and hardness at elevated temperatures. This grade is available as electric furnace vacuum degassed steel to meet high aircraft quality standards and is suitable for the fabrication of parts which may be subjected to magnetic particle inspection.


4340 Alloy Steel Grade Chemistry
Fe Ni Cr Mn C Mo Si S P
MIN 95.195 1.65 0.70 0.60 0.370 0.200 0.150
MAX 96.33 2.0 0.90 0.80 0.430 0.300 0.300 0.04 0.035



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