Ductile Iron: The Ideal Choice for Compressor & Pump Components

In industrial machinery, material selection defines performance, reliability, and service life. For compressors, pumps, and valves working under extreme pressures, components such as cylinders, valve bodies, and pistons must combine high strength with superior ductility.

The material that achieves this balance is ductile iron, particularly high-elongation grades like ASTM A395 and QT450-10.

ASTM A395: Benchmark of High Ductility

ASTM A395 is a ferritic ductile iron known for:

• High elongation (up to 20%) → excellent impact resistance and crack prevention

• Applications:

  • Compressor cylinders – resists high-pressure gas impacts

  • Pump bodies & valves – ensures structural integrity and tight sealing

  • Pipes & fittings – reliable under bending or impact loads

Chinese Grades: QT450-10 vs QT500-7

China’s equivalent ductile iron grades offer reliable alternatives:

• QT450-10

  • Tensile strength ≥ 450 MPa

  • Yield strength ≥ 280 MPa

  • Elongation ≥ 10% → strong toughness and crack resistance

  • ✅ Closest equivalent to ASTM A395, best for pressure-bearing parts

• QT500-7

  • Tensile strength ≥ 500 MPa

  • Elongation ≥ 7% → stronger but less ductile

  • ⚙️ Best for strength-critical but toughness-light applications

👉 For projects prioritizing ductility and impact resistance, QT450-10 is the ideal choice.

Why Choose Keepwin for Custom Components?

At Keepwin, material expertise meets precision manufacturing:

• Professional Expertise: Accurate material recommendation based on working conditions

• Flexible Customization: Standard and non-standard castings with full machining capability

• Exceptional Quality: Rigorous quality control to ensure durability and performance

We deliver high-performance compressor, pump, and valve components designed for long-term reliability.

Take Action Today!

If you need reliable cylinders, pump housings, or valve components made of ductile iron, contact Keepwin now. Our custom-engineered solutions will help you achieve superior efficiency, toughness, and operational stability.