A comprehensive presentation on topic; Microalloyed(HSLA) Steels

1. Microalloyed(HSLA) Steels
PREPARED BY: ADNAN AKBAR(MME-16-06)

2. Microalloyed Steels
 Microalloyed steels, often referred to as HSLA steels, are low-
carbon steels with the strength increased by small amounts
of alloying elements such as niobium, vanadium, titanium,
molybdenum or boron, singly or in combinations.
 These steels are designed to provide better mechanical
properties and greater resistance to atmospheric corrosion.
 Microalloyed steels are low carbon, formable steels with high
strength.

3. Composition of Microalloyed Steels
 Carbon(0.03-0.15)%
 Manganese(1.5-2)%
 Niobium, vanadium, titanium, molybdenum, zirconium, boron(less than
0.1%)

4. Microalloyed Steels Possess
 High strength to weight ratio
 Improved low temperature toughness
 Fatigue resistance
 High temperature creep resistance
 Atmospheric corrosion resistance
 Improved notch toughness
 Weldability
 Formability

5. Strengthening Mechanisms in
Microalloyed Steels
 Refining the ferrite grain size(Grain size effect)
 Precipitation hardening
 Solid-solution strengthening
 Work hardening

6. Properties of Microalloyed Steels
 Yield strength(290-550)Mpa
 Tensile strength(415-700)Mpa
 Ductile to brittle transition temperature(-70C)
 Hardness(82-98)HRB

7. Applications of Microalloyed Steels
 Bridges
 Suspension Components
 Building Structures
 Vehicles
 Transportation
 Tubular Components
 Heavy Equipment
 Rails

8. Fig: Microstructure of V-Nb-N microalloyed steel