Ductile SiMo Iron




By increasing the Silicon and Molybdenum content of SG Iron, the heat resistance and strength at high temperatures is increased.

Physical properties depend on temperatures; typical values are detailed in the table below:

C=3.2-3.8%, Si=4.0-5.0%, S < 0.02%, Mg=0.03-0.07%, Mo=0.5-1.5%

Temperature oCTensile Strength N/mm20.2% Proof Stress N/mm2Modulus of Elasticity N/m x 104Hardness BHN
2355048014.8(200-240)
30048039514 
50035027012 
80050302.5 

The main application for SiMo is in Automotive Exhaust and Turbocharger Systems, but it is suitable for any high temperature application where both strength and ductility are required.

Machineability is similar to that of EN-GJS-500-7.




spots
Typical Microstructure

Guideline Figures for Maximum Manifold and Exhaust Gas Temperatures

Material GradeMax. Manifold Temperature CMax. Exhaust Gas Temperature C
EN-GJS-400-15700770
EN-GJS-SiMo (0.5% Mo)750820
EN-GJS-SiMo (1.0% Mo)780820
EN-GJS-SiMoNi795835
Ni Resist D-5S870950