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4330 Vac Mod AMS 6411 steel is a modification of 4330 steel with several properties improved by the addition of vanadium. 4330V Mod is a low alloy steel capable of being heat treated to high strength levels. The alloy is primarily used in the 220 to 240 ksi strength range. 4330 Vac Mod AMS 6411 steel is produced by the vacuum consumable electrode melting process to provide optimum cleanliness and preferred ingot structure.

The comparatively low carbon content of the alloy makes it particularly useful in applications involving shock loading or stress concentration. It features strength and high resistance to crack propagation and exceptional low temperature impact properties. Typical applications of 4330 Vac Mod AMS 6411 are for high strength, aerospace, and power generator defense. 4330 Vac Mod AMS 6411 steel is primarily used in the oil industry for oil tools and drill jars. In the aerospace industry, 4330 Vac Mod AMS 6411 is primarily used for bolting and air frames.

Chemical Properties

Element min max
Carbon 0.28 0.33
Manganese 0.65 1
Silicon 0.15 0.35
Phosphorus — 0.015
Sulfur — 0.015
Chromium 0.75 1
Nickel 1.65 2
Molybdenum 0.35 0.5
Vanadium 0.05 0.1
Copper — 0.35

Physical Properties

Property Value
Tensile Strength 220.0 ksi
Yield Strength at 0.2% Offset 185.0 ksi
Elongation in 4D 10%
Reduction of Area 35%

Select AMS Number:

AMS Number Alloy Type UNS Cross Ref. Spec Misc./Shape
AMS 6411 4330 Mod Steel K23080  
AMS 6411 Bar 4330 Mod Steel K23080 - Bar AMS 6411 Bar
AMS 6411 Forging 4330 Mod Steel K23080 - Forging AMS 6411 Forging
AMS 6411 Tubing 4330 Mod Steel K23080 - Tubing AMS 6411 Tubing
AMS 6427 4330 Mod Steel K23080  
AMS 6427 Bar 4330 Mod Steel K23080 - Bar AMS 6427 Bar
AMS 6427 Forging 4330 Mod Steel K23080 - Forging AMS 6427 Forging
AMS 6427 Tubing 4330 Mod Steel K23080 - Tubing AMS 6427 Tubing