4140 is an alloy steel that is supplied in either annealed or prehardened condition. The chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. It is characterized by its high fatigue strength, torsional strength, abrasion resistance, toughness.
Alloy E-4330 is a high-strength alloy steel containing chromium, nickel and molybdenum with a carbon content in the range of 0.30% range. It is heat treatable and offers good formability and machinability with exceptional cold working characteristics.
An electric-furnace processed, E-8740 is a Nickel Chrome Molybdenum alloy produced for case hardening. It is a very tough alloy, with excellent shock resistance and especially free from temper brittleness.
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