Cast Iron

Cast Iron is a group of iron-carbon alloys with a carbon content greater than 2%. It is characterized by its castability and excellent castability properties, making it well-suited for a variety of applications.

We offer the following grades of Dura-Bar®:

  • Dura-Bar 65-45-12 ductile iron – Conforms to ASTM A536 grade 64-45-12, contains nodular graphite in a matrix of ferrite with a small amount of pearlite
  • Dura-Bar 80-55-06 ductile iron – Similar to ASTM A536 grade 80-55-06, contains nodular graphite in a matrix of ferrite and pearlite
  • Dura-Bar G2 – Similar to ASTM A48 class 40, contains Type A graphite


  • Brittleness: Cast iron is more brittle than many other materials, and it tends to fracture rather than deform under stress.
  • High Wear Resistance: White iron, in particular, exhibits high wear resistance due to its hardness.
  • Excellent Castability: Cast iron can be easily cast into intricate shapes, making it suitable for a wide range of applications.
  • Good Heat Retention: Cast iron cookware is known for its ability to retain and distribute heat evenly.
Types of Cast Iron
  • Gray Iron: The most common type of cast iron, known for its gray appearance. It has good castability and excellent damping properties. Applications include engine blocks, pipes, and cookware.
  • White Iron: Known for its hardness and abrasion resistance, white iron is used in applications where wear resistance is crucial, such as in crushing equipment and certain types of rolls.
  • Ductile Iron (Nodular Iron): Contains small amounts of magnesium or cerium, which changes the graphite structure from flakes to nodules. Ductile iron has improved strength and ductility compared to gray iron.
  • Malleable Iron: Heat-treated white iron or ductile iron, which undergoes a process called annealing. Malleable iron has good ductility and is used in applications requiring high toughness.
  • High Carbon Content: Cast iron has a high carbon content, typically ranging from 2% to 4%. This high carbon content contributes to its unique properties.
  • Silicon: Silicon is often present in cast iron to improve fluidity during casting.
  • Impurities: Cast iron may contain other elements like sulfur, phosphorus, and manganese, depending on the specific type.
Corrosion Resistance

Corrosion Resistance: While cast iron is prone to rusting, surface treatments and coatings can be applied to enhance corrosion resistance.

  • Automotive: Engine blocks, cylinder heads, brake disks, and other automotive components.
  • Pipes and Fittings: Gray iron is commonly used for water pipes and fittings.
  • Cookware: Cast iron cookware is valued for its even heating and heat retention properties.
  • Construction: Cast iron is used in various construction applications, including columns and ornamental elements.
  • Machinery and Equipment: Certain machinery components, such as gears and pulleys, may be made from cast iron.
Surface Finish

Surface Finish: Cast iron surfaces can have a textured appearance due to the sand casting process. Surface finishes can be improved through machining or coating.