Gray Iron is commonly referred to as Cast Iron.The name, Gray Iron, is derived form the characteristic gray color of the casting when fractured.Characteristic properties of Gray Iron are excellent machinability, good wear resistance, high vibration absorption, and good fluidity.Types of Gray Iron are commonly designated by a class number which indicates minimum tensile strength in thousands of pounds per square inch (KSI).Lower Classes of Gray Iron provide better machinability with higher classes offering strength and wear resistance.Castings are intended for general engineering use.
Machine Frames and Bases
ASTM A278 Pressure Containing Castings for elevated temperatures
ASTM A319 Non-pressure containing castings for elevated temperatures.
A319 may be alloyed with Chrome and Copper.
Stoker and Fire Box Castings
Ductile Iron is commonly known as Nodular Iron.The name Nodular Iron comes from the fact that graphite in Ductile Iron forms in spheres or nodules.This provides the metal with considerable elasticity, impact resistance and high yield strength.Ductile Iron has steel like mechanical properties with the castability, machinability, and corrosion resistance of Gray Iron.The three numbers in the Ductile Iron designation represent the physical properties of the iron.First is the Minimum Tensile strength in thousands of pounds per square inch (KSI), second is the Minimum Yield Strength (KSI) followed by the Percent Elongation.
Machinery castings subject to shock and fatigue loading
Shanks for Asphalt Mixers and Pug Mills
Gears and Rollers
Flap Valve Housings
Abrasion Resistant Iron
Abrasion Resistant Irons are low in silicon and are generally alloyed with Nickel and Chrome. There is an insignificant amount of graphite present in Abrasion Resistant Irons.The majority of carbon is in the form of iron carbides making it very hard, brittle and in most cases unmachinable.Abrasion Resistant Irons excel in applications with a high degree of wear and low impact.