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Malleable cast iron for EN-GJMW

Chemical designationMalleable cast iron for EN-GJMW
Etching3% Nital

The microstructure of malleable crude cast iron consists of ledeburite II and perlite with secondary cementite. Malleable cast iron solidifies according to the metastable system.  The carbon in malleable cast iron is present as cementite (Fe3C) and is therefore graphite-free. A distinction is made between 2 types of malleable crude cast iron:

Malleable grey cast iron for white malleable cast iron EN-GJMW
Standard values of chemical composition:

  • Carbon: 2.8-3.4 % (high)
  • Silicon: 0.4-0.8 % (low)
  • Manganese: 0.4-0.6 % (low)
  • Sulphur: 0.12-0.25 %
  • Phosphorus: 0.1 %

Malleable grey cast iron for black malleable cast iron EN-GJMB
Guide values of chemical composition:

  • Carbon: 2.0-2.9 % (low)
  • Silicon: 1.2-1.5 % (high)
  • Manganese: 0.4-0.6 %
  • Sulphur: 0.12-0.18 %
  • Phosphorus: approx. 0.1 %

The SEM images show a force fracture by tensile test. A transcrystalline, brittle violent fracture is present.

Cast Iron

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