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EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 05
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 01
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EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 04
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 05
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 06
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 07
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 08
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 09
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 10
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 11
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 12
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 13
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 14
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 15
EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test - 16

EN-GJS-SiMo30-7 | 5.3112 Graphite classification and fracture appearance in tensile test

Numeric designation5.3112
Chemical designationEN-GJS-SiMo30-7
StateGraphite classification and fracture appearance in tensile test
Etching3% Nital

SiMo cast irons are an alloyed, ferritic nodular cast iron. By adding molybdenum and silicon, both the high-temperature strength and the oxidation resistance at elevated temperatures are increased, so that castings made of this material are optimally suited for use at higher temperatures.

The microstructure of this ductile iron is ferritic. Interdendritic Mo-rich M6C carbides are surrounded by fine precipitates of probably cementite.

Chemical composition

  • C: 3,3 %
  • Si: 3.0 % (shall: 2.8 – 3.2 %)
  • Mo: 0.7 % (0.6 – 0.8 %)
  • Mn: 0.2 %

Mechanical properties

  • Rm: 461 MPa
  • Rp0.2: 343 MPa
  • A5: 8 %

Graphite classification according to EN ISO 945-1:2019

  • Graphite shape VI
  • Guide number for size range: 6

The fracture surface of the tensile specimen shows honeycomb fracture with many exposed graphite spheres in the incipient area, and predominantly cleavage fracture with low honeycomb fracture fractions (quasi-cleavage fracture) in the later course of fracture. This transition from ductile to brittle fracture behaviour has to do with the increasing rate of fracture propagation.

Cast Iron

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