Traditional Cast Iron Vs. Ductile Iron: Which Is More Durable?

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Traditional Cast Iron Vs. Ductile Iron Which Is
More Durable?
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Introduction

• Iron is a commonly used material in various
  applications and has been used for centuries.
• Cast iron and ductile iron are two types of iron
  commonly used in industrial applications.
• Choosing between cast iron and ductile iron
  depends on the specific application.
• Valves are available in a wide range of
  materials, including PVC, carbon steel, stainless
  steel, cast iron, and ductile iron.
• Cast iron casting manufacturers contribute to
  sustainable manufacturing practices.
• There aren't many significant variations between
  cast iron and ductile iron, making it easy to
  compare valves made from either type.

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Cast Iron

• Carbon and silicon are added to iron when melted
  to create cast iron
• Grey color of cast iron comes from graphite
  particles in its carbon content
• Cast iron has excellent wear resistance,
  machinability, and affordability
• Commonly used in cookware, pipelines, and engine
  blocks for strength and longevity
• Hardness of cast iron provides resistance to
  surface wear but makes it fragile under pressure
• Prone to corrosion leading to rust and
  degradation over time

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Ductile Iron

• Ductile iron is a modern alloy developed in the
  mid-20th century by adding magnesium to molten
  iron.
• The addition of magnesium causes graphite to form
  in nodules, giving the material its
  characteristic ductility.
• Ductile iron is known for its excellent strength,
  toughness, and durability, making it suitable for
  high-strength applications.
• One of the main advantages of ductile iron is its
  ductility, making it less brittle and more
  resistant to cracking under stress.
• Ductile iron is commonly used in pipes,
  automotive parts, and machinery due to its
  properties.
• Ductile iron is more corrosion-resistant than
  cast iron, making it a better choice for outdoor
  applications.
• However, ductile iron is more expensive than cast
  iron due to its more complicated chemical makeup.

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Comparison

• Ductile iron is more durable than cast iron due
  to being less brittle and able to bend without
  fracturing easily
• Cast iron is harder and better at managing
  surface wear and vibration damping
• The microstructures of graphite within these iron
  alloys contribute to their differences
• Ductile iron has excellent corrosion resistance,
  tensile strength, and yield strength
• Ductile iron does not break when bent, making it
  more suitable for high-demand applications
• The best ductile iron products suppliers in India
  focus on quality control and efficient
  manufacturing processes, surpassing industry
  standards consistently

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Difference Between Ductile Iron and Cast Iron
Specification Ductile Iron Cast Iron
Strength Has Superior strength, can bend without losing form Cast iron is more prone to breaking and is not suitable for certain purposes
Cost Due to its strength and durability, ductile iron is more costly than cast iron Cast iron costs less since it is simpler to make but more costly overall because it needs constant upkeep.
Employer-side Applications Due to its strength and longevity, ductile iron is often used in pump casings, valve bodies, big gas and oil pipe applications and major water and sewage lines Due to its low cost and simple casting process, cast iron is favoured for smaller pipes, guttering pipes and stove/grill plates.
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Choosing Between Cast Iron and Ductile Iron

• Ductile iron is more expensive than cast iron but
  easier and cheaper to cast than steel
• Ductile iron is chosen for its ductility and
  impact resistance, making it less brittle than
  cast iron
• Cast iron is better than steel for damping, but
  ductile iron is better for compressive yield and
  vibration damping
• Ductile iron is commonly used in bollards, pipes
  under pressure, cable casings, pumps, and vehicle
  parts
• Cast iron is popular for applications where
  brittleness is not a concern, such as tree
  grating, trench grating, manhole covers, and
  machine bases
• Consulting a metallurgist or engineer is
  important when selecting an alloy for a project
  based on operating stress and application
  requirements.

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Thanks!

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