Chrome white iron is comprised of carbides and martensite.  This combination makes chrome white iron exceptionally wear resistant and hard.  The carbides in chrome white iron have a hardness range of 1500-1800HV and are primarily eutectic carbides.  They form bundles of hollow hexagonal rods.  The growth of these rods will drastically affect the properties of the casting, which is controlled through the careful engineering of the chemical composition.  Abrasion resistance is the property most desired when selecting a chrome white iron casting.  At the foundry level, the microstructure (carbides and martensite) is controlled to maximize the abrasion resistance for an application.  There are many phenomena at work during cutting, gouging or scratching types of abrasion.  The presence of carbides, the fatigue resistance and the toughness of high chrome white iron all play an important role in its abrasion resistance.

MGS Casting chrome white iron casting parts include:

Chrome White Iron Blow Bars
Chrome White Iron Impact Plate
Chrome White Iron Liners
Chrome White Iron Grinding Balls

Chrome White Iron Steel Casting Heat Treatment

The tensile properties shown above represent typical properties which are averages over a number of production heats. These properties were obtained using the chemical composition shown above. Although the tensile properties are a function of tempering temperature, they are relatively unaffected by normalizing treatment. Those shown above were obtained with a double normalizing consisting of a 1900° F. heat treatment for 1 hour per inch of thickness which was air cooled, followed by a 1600° F. heat treatment for 1 hour per inch of thickness which was air cooled. Similar properties can be obtained with a single normalize.