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Medium steels
It contains
between 0.25 -0.7% carbon and used for machine
components requiring high strength and good
fatigue resistance. Medium steels are stronger
than low carbon steels and can be further
strengthened by heat treatment. They are used
for shafts, high tensile tubes, wires, fish
plates, turbo-generator, shafts, dies, razor,
die blocks, gears, railways wheel steel tires,
agricultural tools.
Medium steels are classified as follows
1) Steel containing 0.35 to 0.45 % carbon.
The tensile strength is about 750 N/mm2. They
are used for making:
- Connecting rods
- Wires ands rods
- Spring clips
- Gear Shafts
- Key Stock
- Shift and brake levers
- Axles
- Small and medium forgings
2) Steels containing 0.45 to 0.55% carbon.
The tensile strength is about 1000 N/mm2
and are
used for making parts subjected to shock and
stress. Such steels are used for making:
- Railways coach axles
- Axles
- Crank pins for heavy machines
- Spine shafts
3) Steel containing 0.6 to 0.7% carbon. The
tensile strength is about 1230N/mm2 and a
hardness of 400-450 BHN. Such steels are used
for making:
- Drop forging dies
- Die blocks
- Set screws
- Clutch discs
- Plates punches
- Valve Springs
- Cushion rings
- Thrust washers
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