What grade of steel is corrosion resistant besides
Depending on your definitions of "grade" of steel and what you mean by
"corrosion", Cor Ten steel is considered corrosion resistant even though it
works on the principle of producing a surface layer of oxide material (a
type of rust) that protects the underlying steel from further corrosion. It
is used a lot on buildings and bridges. You can also consult a materials
handbook in a good reference library or contact the American Institutute of
Steel Construction (AISC) [I believe they are in Pittsburgh, but not sure]
for additional information on corrosion resistant steels. Another item is
galvanized steel, but I do not know if you are looking at an application
involving large structural steel members or small metal items.
Since you confined your answer to steel, I presume you are not looking at
titanium (used in golf clubs, etc.) or anything in the zirconium family
(like zircaloy--used in making nuclear fuel rods) for its corrosion
resistant properties. These metals are expensive.
I am not a "metals" guy and this is my limited knowledge at present. Hope it
helps a little.
Galvanized, galvannealed, and aluminized are all types of processed
steel that would be corrosion resistant.
Steel grades with greater than 8% alloying metals would be pretty much
corrosion resistant. Looking through my handbook, I did not see any
carbon steels with less than 8% alloying metals. All stainless grades
have much higher than 8% alloy metals.
Tool steel grades are high alloy. Superalloy grades are even higher
(usually not even based on iron) and are designed for use above 540
degrees C (1000 F)!
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Update: June 2012