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Metric Steel

AISI 4340 - Q&T

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 ANALYSIS AISI 4340 
Carbon (C).38/.43
Manganese (Mn) .60/.80
Silicon (Si).15/.35
Molybdenum (Mo).20/.30
Chromium (Cr) .70/.90
Nickel (Ni) 1.65/2.00
Sulphur (S) .040 MAX
Phosphorus (P) .035 MAX


Process Shape Size
Heat Treated
Rounds
1" - 8" diameter

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