Steel Grade AISI 4340

4340 is a highly alloyed steel with high nickel and chromium content which assures deep hardening when oil quenched, with high strength characteristics throughout the section. Used for heavily stressed parts operating under strenuous conditions.

 Typical Chemical Analysis

Carbon 0.38 - 0.43%
Managnese 0.60 - 0.80%
Phosphorous 0.035% max
Sulfur 0.040% max
Silicon 0.15 - 0.35%
Molybdenum 0.20 - 0.30%
Chromium 0.70 - 0.90%

 Typical Mechanical Properties

Tensile strength (ksi) 150
Yield strength (ksi) 140
Elongation (% in 2") 20
Brinell 307
Rockwell C31

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