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Introduction

V – HSLA is Vanadium - High Strength Low Alloyed Steel (0.03 % – 0.08 % V).  Vanadium is characterized by fine grains ferrite and pearlite structure, high yield and tensile strength, good  ductility and impact (toughness) properties, improved strain aging. It is a strong carbide and nitride former. These elements form very fine particles which precipitate during transformation process. The particles are located in the interface between the decomposed austenite and newly formed ferrite.

V – HSLA is excellence reinforcing steel bars for seismic resistant structures, due to :

  • Homogenous microstructure (fig.1) & hardness at any point across the bar (200 VHN), even if on the high temperature (fig.2)


    Fig. 1 – Micro structure & hardness number (room temperature)

    *Metallurgy Lab – Mechanical Engineering ITB (2007)


  • Better ductility and toughness properties  that shows long plastic period at monotonic loading (blue curve on fig.3)


    Fig. 2 – Micro structure & hardness number (high temperature)

    *Metallurgy Lab – Mechanical Engineering ITB (2007)

  • Better  over strength  properties
    • ratio of actual yield point to specification yield point < 1.35
    • ratio of tensile strength to yield point > 1.25


    Fig. 3 – P-?l curves

    *Structure Lab –Civil Engineering ITB (2006)


  • Better energy dissipation during cyclical loading (blue curve on fig.4) for seismic resistant, it also showed stabile curve without pinching phenomena. 

    Red curve by others product showed unstable curve, there’s capacity degradation on the peak cyclic. Pinching phenomena occurred on this structure.


    Fig. 4 – Hysteretic behaviour of static-cyclic test walls

    *Structure Lab –Civil Engineering ITB (2006)

 

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