SynopsisSteels with carbon content from 0.13 to 0.0¢ % were rolled in temperature range 1 220 to 750°C and subsequently air cooled. The microstructure as well as mechanical properties were investigated. The grain size in steels is first gradually decreased with lowering rolling temperature, and then it is fastly increased with further lowering of rolling temperature down to ferrite range. The microstructure is the more coarse and heterogeneous the less completed was the interpass recrystallisation of austenite and the more ferrite was present in steel during the rolling. The rolling in ferrite range produces a strong anisotropy in tensile ductility.
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