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 6150 is a medium carbon, chrome-vanadium, highly abrasion resistant, fine grain, killed alloy steel. When heat-treated, the material has excellent toughness and very good shock resistance making 6150 a good alloy for parts open to stress, shock, and vibration.
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.
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