Gray Iron vs Ductile Iron for Roots Blower Housings

Choosing the Right Material for Blower Housing Castings

One of the most important engineering decisions in Roots blower manufacturing is selecting the appropriate casting material. The two most widely used materials are gray cast iron and ductile iron.

At WALKSON, both materials are used depending on application requirements such as pressure resistance, vibration damping, and mechanical strength.

Product reference:
https://www.walkson.com/blower-housing-casting.html

Gray Cast Iron (EN-GJL-200 / ASTM A48)

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Gray iron contains graphite flakes, which provide excellent vibration damping.

Typical Properties

Standard references:

• ASTM A48

• EN 1561

Advantages

• Excellent machinability

• Low cost

• Superior vibration damping

Ductile Iron (EN-GJS-400 / ASTM A536)

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Ductile iron contains spheroidal graphite, providing superior mechanical strength.

Typical Properties

Standard references:

• ASTM A536

• EN 1563

Engineering Comparison

Which Material Is Best for Blower Housings?

Gray iron is preferred for:

• Standard Roots blowers

• Medium pressure applications

• Noise-sensitive environments

Ductile iron is preferred for:

• High-pressure blowers

• Heavy industrial loads

• Structural components

WALKSON Material Engineering Expertise

WALKSON engineers evaluate:

• operating pressure

• temperature range

• fatigue load

before recommending a material.

Learn more about our casting capabilities:
https://www.walkson.com

Conclusion

Both gray iron and ductile iron offer advantages in blower housing manufacturing. Selecting the right material ensures durability, efficiency, and reduced maintenance costs in industrial blower systems.