Summary In this work gasification of different types of coke (higher quality and lower quality) were subjected with two different gas-atmosphere profiles (H₂-H₂O-CO-CO₂-N₂ and CO-CO2-N2) simulating Blast Furnace circumstances. It was found out that coke was more reactive towards H₂ and H₂O containing gas atmosphere. After gasification, coke samples were subjected to compression strength tests. It was found out that although higher quality coke reacted more intensively in H₂ and H₂O containing atmosphere, the compression strength properties were not harmed by the reaction of a higher extent. The compression strength properties were improved after gasification in H₂ and H₂O containing atmosphere for the higher quality coke. This could be due to increase in small-scale pores which make the porous structure more uniform and therefore decrease the heterogeneity of elasticity throughout the coke structure. Image analysis showed a linear correlation between strength, strain and area percentage of large pores in the coke structure.