# Iron content in 3M Nickel based steel crowns is:

# Iron content in 3M Nickel based steel crowns is: (MAN -01)
a) 20%
b) 40%
c) 60%
d) 10%


The correct answer is D. 10 %.

Composition of stainless steel crowns:
Stainless steel (18-8) austentic type of alloy is used. Eg.: Rocky mountain and unitek.
Iron -                 87%
Chromium - 17%
Nickel -         12%
Carbon -          0.08 - 1.15%

Nickel base crowns. Eg.: Iconel 600 and 3M crowns
Iron                     -  10%
Chromium -    16%
Nickel - 72%
others - 2%

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