New laboratory tests have been developed to characterise the
coke behaviour at high temperature under conditions similar to
those encountered in the blast furnace, especially in terms of
gasification degree. The validity of these new tests has been demonstrated by comparison
with the modifications undergone by coke in the blast furnace.
The latter have been determined by comparing cokes sampled
by a tuyere probe with cokes sampled before charging. The results showed only little correlation with the classical coke characterisation indices (I10, I40, CSR), which indicates that they really bring new information on coke properties.