QT450 Ductile Iron

QT450 is a widely used ductile iron grade in which graphite is formed into spheroidal nodules. Compared with gray cast iron, it offers higher strength, toughness, and impact resistance while retaining good castability, wear resistance, and machinability.

Appearance & Properties

Color: Dark gray to gray-black

Density: Approx. 7.0–7.2 g/cm³

Tensile Strength: Typically ≥450 MPa

Wear Resistance: Good

Machinability: Good

Toughness: Good

Impact Resistance: Better than gray cast iron

Castability: Good

Magnetism: Magnetic

Surface Finishes: Painting, black oxide, phosphating, plating, grinding, etc.

Typical Applications

QT450 Ductile Iron is widely used in automotive, construction machinery, industrial equipment, agricultural machinery, pumps and valves, and power transmission systems.

Typical parts include wheel hubs, gears, brackets, bearing housings, pump bodies, valve bodies, flanges, machine housings, and various CNC-machined cast components.

Advantages

• Higher strength and toughness than conventional gray cast iron

• Good impact and fatigue resistance

• Good machinability

• Good wear resistance and load-bearing capability

• Suitable for complex cast structural components

Limitations

• Relatively heavy and not ideal for lightweight designs

• Poor corrosion resistance and usually requires surface protection

• Limited weldability

• Lower strength than some alloy steels