HT250 Gray Cast Iron

HT250 is a widely used medium-to-high-strength gray cast iron known for its good castability, machinability, wear resistance, and excellent vibration-damping capability. Its flake graphite structure helps absorb vibration, making it particularly suitable for machine tools and rigid, dimensionally stable mechanical structures.

Appearance & Properties

Color: Dark gray to gray-black

Density: Approx. 7.0–7.3 g/cm³

Tensile Strength: ≥250 MPa

Wear Resistance: Good

Machinability: Good

Vibration Damping: Excellent

Compressive Strength: Excellent

Castability: Good

Magnetism: Magnetic

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

Typical Applications

HT250 is widely used in machine tools, automotive, industrial machinery, pumps and valves, power equipment, and general mechanical manufacturing.

Typical parts include machine beds, worktables, bases, housings, gearbox housings, pump bodies, valve bodies, end covers, and various CNC-machined castings.

Advantages

• Excellent vibration damping

• Good machinability

• Good wear and compressive performance

• Good castability for large and complex components

• Relatively economical overall cost

Limitations

• Relatively brittle with limited impact resistance

• Lower tensile strength than steel

• Poor weldability

• Susceptible to surface oxidation and rust without protection