2. Steel used to make rails for railway
lines is called rail steel
3. Train speed is higher
Axle load is higher
Intensive use of tracks
Burning of rails due to faster wheel spin
4.
5. SL NO ELEMENT EFFECT
1 CARBON decreases the ductility, formability,
weldability increases the strength and
hardenability
2 SILICON Improve oxidation resistance,
strength
3 MANGANEESE increases the strength, shock
resistance, toughness, hardenability
4 CHROMIUM increases, strength, hardenability,
corrosion resistance, high
temperature strength, decreases the
oxide formation tendency.
5 MOLYBDENUM increases the hardenability, high
temperature strength
6 ALUMINIUM deoxidiser
7 PHOSPHORUS decreases the toughness, impact
resistance increases the corrosion
resistance
8 BORON Increases hardenebility
6.
7. SL No Element Effects in CCT
1 B,Mo Suppress ferrite &
pearlite production
2 Al Removes excess
oxygen and prevent
gas porosity during
casting
3 Si Retard the formation
of cementite
8.
9.
10.
11. High wear resistance
Longer life
Improved straightness and flatness
Reduced surface and internal defects
Improved safety
Less maintenance
