Cast iron with lamellar graphite

Designation in accordance with
DIN EN 1561
      EN-GJL-150 EN-GJL-200 EN-GJL-250 EN-GJL-300
Reference analysis C     3.40 – 3.60 3.20 – 3.40 2.90 – 3.10 2.90 – 3.10
for medium wall thicknesses Si     2.30 – 2.60 2.00 – 2.40 1.80 – 2.10 1.60 – 1.90
  Mn     0.60 – 0.90 0.70 – 1.00 0.80 – 1.10 0.80 – 1.10
Microstructure      


Pearlite,
coarse lamellar 100:1


Pearlite,
coarse lamellar 100:1


Pearlite,
fine lamellar 100:1


Pearlite,
fine lamellar 100:1
Mechanical properties 1)
Tensile strength Rm MPa   150 – 250 200 – 300 250 – 350 300 – 400
- dependent on wall thickness Rm MPa 2.5 – 50 mm 150 200 - -
      5 – 50 mm - - 250 -
      10 – 50 mm - - - 300
      50 – 100 mm 130 180 220 260
      100 – 200 mm 110 160 200 240
Yield strength Rp0.1 MPa   98 – 165 130 – 195 165 – 228 195 – 260
Elongation at fracture A %   0.8 – 0.3 0.8 – 0.3 0.8 – 0.3 0.8 – 0.3
Elastic modulus E GPa   78 – 103 88 – 113 103 – 118 108 – 137
Bending fatigue strength   MPa   0.46 x Rm 0.46 x Rm 0.46 x Rm 0.46 x Rm
Compression-tension fatigue strength   MPa   0.34 x Rm 0.34 x Rm 0.34 x Rm 0.34 x Rm
Hardness/material designation       EN-GJL-HB175 EN-GJL-HB195 EN-GJL-HB215 EN-GJL-HB235
- dependent on wall thickness BHN   2.5 – 50 mm 115 – 175 - - -
      5 – 50 mm - 135 – 195 155 – 215 -
      10 – 50 mm - - - 175 – 235
      50 – 100 mm 105 – 165 125 – 185 145 – 205 160 – 220
               
Technological properties
Machinability       Excellent Excellent Excellent Excellent
Wear resistance       Average Good Excellent Excellent
Induction or flame-hardening capacity       Poor Low Good Excellent
Nitriding capacity       Good Good Good Excellent
Damping       Excellent Excellent Excellent Excellent
Weldability       Only weldable using special electrodes
Physical properties
Density ρ kg/dm3   7.10 7.15 7.20 7.25
Thermal conductivity λ at 300 °C W/(K*m)   50.0 48.0 46.5 45.0
Thermal expansion coefficient α up to 400 °C 10-6/K   13.0 13.0 13.0 13.0
        Special materials or grades not listed available on request

1) The mechanical properties in integrally cast test specimens with a diameter of 30 mm (minimum values)