Ductile Iron - Composition


A typical chemical analysis of this material:

  • Iron
  • Carbon 3.3 to 3.4%
  • Silicon 2.2 to 2.8%
  • Manganese 0.1 to 0.5%
  • Magnesium 0.03 to 0.05%
  • Phosphorus 0.005 to 0.04%
  • Sulfur 0.005 to 0.02%

Other elements such as copper or tin may be added to increase tensile and yield strength while simultaneously reducing elongation. Improved corrosion resistance can be achieved by replacing 15% to 30% of the iron in the alloy with varying amounts of nickel, copper, or chromium.

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