PRESENTATION OUTLINE
ELEMENTS OF THE ALLOY
*The following elements make up stainless steel:
-carbon
-manganese
-phosphorus
-sulfur
-silicon
-nickel
-chromium
INTERSTITIAL OR SUBSTITUTIONAL?
- The correct answer is both. With stainless steel, the carbon atoms are small enough to fit into the spaces between the iron atoms making it interstitial, but also some of those iron atoms are replaced with nickel and chromium atoms making it also substitutional.
EARLIEST EVIDENCE?
- In 1821, the French metallurgist Pierre Berthier used iron-chromium alloys similar to stainless steel in his experiments where he stated the alloy had excellent resistance to acids and suggested their use in cutlery.
Particle Level Drawing Cont.
- The red dots represent the iron atoms crystalline structure.
- The small green dots represent the carbon atoms which have lodged themselves between the iron atoms. (Interstitial)
- The blue and orange dots represent the other elements of stainless steel such as nickel and chromium which have replaced the iron atoms. (Substitutional)
Helpful Properties?
- Addition of chromium to the alloy makes stainless steel have a much slower oxidation and corrosion rate than regular steel.
- Stainless steel has a very high acid resistance making it good for use in the home with cooking.
- Stainless steel also is a very poor conductor of electricity making it good for appliances in the home where electrical shorts can occur.
Interesting Facts:
- The chromium actually combines with oxygen to form a protective layer over the stainless steel which causes it to rust slower.
- There are over 150 grades of stainless steel.
- The St. Louis Arch is covered in 886 tons of stainless steel.
"Whoever wields the stainless steel kitchen knives also wields justice." - Hunter
Stainless steel microwaves by Hunter.
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The St. Louis Arch is an example of a structure constructed with stainless steel.
Some aircrafts are also constructed out of stainless steel.
This presentation was brought to you by Hunter Peck and Daniel Lepore.
