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API X80 Steel
Steel name: API X80
Diagram No.: 7624
Type of diagram: CCT
Chemical composition in weight %: 0.03% C, 0.23% Si, 1.62% Mn, 0.01% P, 0.002% S, 0.05% Nb, plus V, Ti, Mo, Cu, Ni, Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B
Steel group: High strength steels
Note: the measured results of the transformation
behavior of Steel B by the CCT diagram are shown in
Fig. As can be seen in the microstructure obtained at
the cooling rate of 10°C/s, bainitic ferrite formed when
a high cooling rate was used, and the aimed single phase
microstructure was obtained. The transformation start
temperature in this case is around 600°C, and the critical
cooling rate which was the lower limit for obtaining a
single phase microstructure was approximately 10°C/s.
The pearlite transformation starts at 600°C or higher
incase cooling rate was lower than the critical cooling rate. As an example of microstructures that was transformed
at a comparatively high temperature, namely,
polygonal ferrite and pearlite, Fig. 3 also shows the
microstructure that formed at the cooling rate of 5°C/s.
It is necessary to avoid the formation of this microstructure,
as it is a coarse microstructure in comparison with
bainitic ferrite and is a factor in reduced toughness. The
critical cooling rate for formation of bainitic ferrite in
Steel B is on a level at which control is sufficiently possible
when manufacturing X80 grade hot coils. This
experiment showed the possibility of obtaining the
bainitic ferrite single phase microstructure by controlling
the steel composition and cooling rate.
Reference: Not shown in this demo version.
Transformation Diagram
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