Chemistry XII Content





Some Special Steels

Steel Composition Properties Uses
Stainless Steel Fe=75%
Cr=18%
Ni=8%
C=1%
Have very high chemical resistance. in using ornamental pieces, cutleries, utensils, etc.
Manganese Steel Fe=86%
Mn=135
C=1%
Very hard and resistant to wear and tear. Railway tracks, safes, safety helmets.
Tungsten Steel Fe=94%
W=5%
C=1%
Very hard. Many high speed cutting tools.
Invar Fe=64%
Ni=36%
Have very small coefficient of linear expansively. in making clock hands , pendulum rods, meter scales, etc.
Nickel Steel Fe=96-98%
Ni=2-4%
Resistant to corrosion and is elastic. wire cables, gears, drive shafts, etc.
Perm alley Fe=21%
Ni=78%
C=1%
Strongly magnetized by electric field and gets demagnetized when current is switched off. used in making electromagnet.

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