Dynamic Metals is a specialist supplier and stockholder of 4330 alloy steel, supplying aerospace and defence industries with certified material to AMS 6411 since 1997. No minimum order quantities.
4330 is a low alloy steel consisting of nickel, chromium and molybdenum and complying with the standard AMS 6411. It possesses an excellent balance of mechanical properties such as strength, toughness and hardenability. With a tensile strength of 1517 MPa and 0.2% proof stress of 1276 MPa in the normalized and tempered condition, this steel is frequently used in aerospace engineering for manufacture of structural parts demanding high reliability of mechanical characteristics under static loads.
Each alloying element imparts certain features to the steel. Nickel (1.65-2.00%) adds impact resistance and toughness, chromium (0.75-1.00%) - hardenability and moderate corrosion resistance, molybdenum (0.35-0.50%) - strength and protection against temper brittleness. Vanadium addition ensures fine grain structure, thus enhancing toughness and fatigue resistance of the steel. 4330 is easy to heat treat and develops consistent mechanical properties across section.
This property is very useful in manufacture of landing gear components and shafts requiring uniform mechanical properties throughout section. In comparison with 4340 (0.28-0.33% of carbon against 0.40%), this grade of steel exhibits higher toughness and ductility due to lower carbon content and hence, is preferable in applications involving impact resistance at the expense of maximum hardness. Typical application areas are aircraft landing gear, aircraft shafts, axles and gears.
