Atlas Foundry Company - logo  
Atlas Foundry home About Atlas Foundry Foundry glossary Site map Contact Atlas Foundry
Atlas Foundry Company - logo  
Atlas Foundry Company - Since 1893 Gray Iron Casting Services Foundry products Equipment Benefits Frequently asked questions (FAQs) Tips and facts Links
 
Foundry - photo
Atlas Foundry Tips and Facts
Overview
Atlas Foundry is ISO9001 certified

Home > Tips and Facts > Mechanical Properties of Gray Iron

Mechanical Properties of Gray Iron

Microscopically, all gray irons contain flake graphite dispersed in a silicon-iron matrix. How much graphite is present, the length of the flakes and how they are distributed in the matrix directly influence the properties of the iron.

The basic strength and hardness of the iron is provided by the metallic matrix in which the graphite occurs. The properties of the metallic matrix can range from those of a soft, low carbon steel to those of hardened, high carbon steel. The matrix can be entirely ferrite for maximum machinability but the iron will have reduced wear resistance and strength. An entirely pearlitic matrix is characteristic of high strength gray irons, and many castings are produced with a matrix microstructure of both ferrite and pearlite to obtain intermediate hardness and strength. Alloy additions and/or heat treatment can be used to produce gray iron with very fine pearlite or with an acicular matrix structure.

Graphite has little strength or hardness. It decreases these properties of the metallic matrix,however, the presence of the graphite provides several valuable characteristics to cast iron. These include:

  • The ability to produce sound castings economically in complex shapes such as water cooled engine blocks.
  • Good machinability even at wear resisting hardness levels and without burring.
  • Dimensional stability under differential heating such as in brake drums and disks.
  • High vibration damping as in power transmission cases.
  • Borderline lubrication retention as in internal combustion engine cylinders.

Next: Composition >>

top

If you would like more information about Atlas Foundry Company and the Gray Iron Casting and other services we provide, please call us at (765) 662-2525, fill out our contact form, or email us at Joe@atlasfdry.com.

Services | Products | Equipment | Benefits | FAQs
Tips & Facts | Links | About Atlas Foundry | Foundry Glossary
Contact Atlas Foundry | Site Map | Back to Home


Atlas Foundry Company, Inc.
601 N. Henderson Avenue
Marion, IN 46952-3348
Telephone: (765) 662-2525 • Fax: (765) 662-2902
Email: atlas@atlasfdry.com • Sales: Joe@atlasfdry.com