Cast iron bars are alloys that contain more than 2% carbon and 1% to 3% silicon. This bar is offered in gray and ductile types. The difference in these types is the shape and distribution of graphite in their microstructure. Continuous casting eliminates porosity inclusion, burned-on impurities and surface flaws.
Cast-iron boilers are used in steam heating or hot water heating applications. It can be constructed in different configurations such as vertical sectional, horizontal sectional and one-piece construction configurations. These are replacements for large welded steel boilers, which may have been installed as the building is being constructed. Vertical sectional cast iron boilers are made up of individual cast iron sections assembled so the sections resemble slices in a loaf of bread. This is probably the most common configuration. Horizontal sectional cast iron boilers are made up of individual cast-iron sections assembled so the sections resemble a stack of pancakes.