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Metric Steel

AISI 4140

This medium carbon alloy grade is widely used for many general purpose parts requiring high tensile strength and toughness. 4140 contains chromium and molybdenum as alloying elements and may be heat treated over a wide range to give the combined advantages of proper hardness, strength and ductility. In conditions where localized hardness may be required, this steel is readily flame or induction hardened.

TYPICAL ANALYSIS AISI 4140  
Carbon (C).38/.43
Manganese (Mn).75/1.00
Silicon (Si).15/.30
Tungsten (W)
Molybdenum (Mo).15/.25
Chromium (Cr).80/1.10
Phosphorus (P).035 MAX
Sulphur (S).040 MAX


Process Shape Size
Cold Drawn Annealed
Flat
Square
Round
1/4" x 2" to 2" x 6"
1/2" - 2"
1/4" - 2"
Heat Treated Round 1" - 12" diameter
Turned, Ground & Polished (TGP) Round
3/4" - 4"
20mm - 80mm
Hot Rolled Annealed Round
2 1/2" - 12" diameter

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