|
Sl. No.
|
Application
|
Desired Properties
|
Composition (% )
|
|
1
|
Rail steel
|
Strength, ductility, impact and fatigue strength
|
C - 0.4 to 0.6 Mn and
Cr - upto 1
|
|
2
|
Spring steel (tension compression, torsion)
|
Good elongation high elastic limit (20 to 30%, 1200-1400 MPa). Good surface finish for fatigue strength
|
(a) C - 0.6, Mn - 0.9, Si - 2.0
(b) C - 0.5, Mn - 0.8, Cr - 1.0, V - 0.15
(c) C - 0.5, Ni - 0.9, Cr - 0.5, Ni - 0.6, Mo - 0.2
|
|
3
|
Structural steel (bridges, building, cars, gears, clutches, shafts)
|
High strength, toughness, high temperature strength, corrosion resistance
|
Wide range of alloy steels containing several alloying elements
|
|
4
|
Weldable steel for welded structures
|
Weldability, high resistance to atmospheric corrosion, resistance to brittle fracture
|
C - 0.15 to 0.3 with some
Cu and V
|
|
5
|
Concrete reinforcing steel
|
Bend 90o - 180o, tor-steel with ribs for greater surface area.
Elongation = 16%, UTS = 500-650 MPa, Y. S. = 35 MPa.
Elongation = 13%,
UTS = 600 MPa, Y. S. = 350 MPa
|
C - 0.3 to 0.4, Mn - 0.5 to 0.8
C - 0.45 to 0.6, Mn - 0.7 to 1.1
|
|
6
|
High speed steel for cutting tools
|
Resist temperature upto
550-600oC. Cutting tools requiring high hardness at working temperature 18 : 4 : 1 steel and
6 : 5 : 4 : 2 steel
|
C - 0.8, W - 18, Cr - 4, V - 1,
C - 0.8, W - 6,
Mo - 5, Cr - 4, V - 2
|
|
7
|
Creep resisting steel
|
Application in pipelines upto
400-550oC. Other parts upto
550oC
|
Mo - 0.4 to 6
V - 0.25 to 1.0
Cr - upto 6.0, C - low
|
|
8
|
Hadfield Mn steel, excavating and crushing m/c. rail road crossing, oil well, cement, mining industries. Used as casting and hot rolled
|
Resistance to abrasion and shock, high toughness strength and ductility
|
C - 1 to 1.4,
Si - 0.3 to 1.0, Mn - 10 to 14
|
|
9
|
High strength low alloy steel (HSLA) for automotive parts
|
High strength/weight ratio. Balanced properties such as toughness, fatigue strength, weldability and formability
|
C - 0.07 to 1.3, Ti, V, Al, Co less than 0.5
|
|
10
|
Ball bearing steel
|
Rolling element, inner and outer races. High hardness
61-65 Rc high fatigue strength
|
C - 0.9 to 1.1, Cr - 0.6 to 1.6, Mn - 0.2 to 0.4
|