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.
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.
A high carbon, chromium electric-furnace processed alloy, 52100 is primarily a bearing steel possessing a high resistance to wear and abrasion. It also is a moderately deep hardening alloy with low softening resistance to elevated temperatures.
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