High Silicon Molybdenum

High Silicon Molybdenum is also referred to as SiMo Ductile Iron and High Silicon Moly. This material is a variation SG Iron that offers superior heat resisting characteristics. High Silicon Molybdenum is typically the choice of engineers for such applications as turbochargers, manifold castings and any high temperature application where resistance to service temperatures of up to 820 degrees C is present. This material also offers good performance under thermal cycling conditions.

The enhanced heat resisting properties of High Silicon Molybdenum is achieved by the addition of varying degrees of Silicon and Molybdenum and carefully controlling carbon levels.

This material offers the following benefits:


This material has a much lower manufacturing cost than heat resisting steels.


High Silicon Molybdenum offers all the benefits of SG Iron in respect of near finished casting shape. Complex casting shapes with many changes of section can be cast.


SiMo is very easily machined. The machining stock levels can be kept to a minimum. The hardness range of this SiMo is typically 200 – 230 BHN.


High Silicon Molybdenum offers good thermal cycling performance and good resistance to growth at high temperature due to the micro structure of this material.