The
TEMPCORE Process
has been
developed in the early seventies by C.R.M., Belgium in order to
manufacture high yield strength weldable concrete reinforcing
bars from mild steel, without V or Nb additions : the Tempcore
rebars.
It consists in subjecting the hot rolled steel to an in-line
heat treatment in 3 successive stages:
Stage1> As soon as it leaves the final mill stand, the
product is rapidly and energetically cooled through a short
cooling installation, where it undergo surface hardening (martensite
layer).
Stage2> As soon as this quenching operation is stopped, the
surface layer is Tempered by using the residual heat left in the
CORE of the bar (self tempering of the martensite layer) ; hence
the name Tempcore.
Stage3> The third stage takes place while the product
lies on the cooling bed where the bar is subjected to normal
cooling down to ambient temperature (transformation of the
residual austenite in the core.
Tempcore is the Best Process
for the Production of High Quality Rebars: Costly alloying
elements (Vanadium, Niobium) are replaced by low-cost ... water,
in order to obtain from low C-Mn steel, concrete reinforcing
bars with : > High mechanical properties (DIN 488 IVS, Fe500,
BS4449-97, ...) > Excellent weldability > Excellent ductility
and bendability
.
Bhagwati Bars
