Steel plate and sections can be rolled according to different schedules through careful control of the rolling mill parameters such as number of passes, length and position of any hold period during rolling, application of cooling sprays, finishing temperature. The control of these parameters means that a single steel composition can be rolled to give different final properties such as ferrite grain size. This is achieved by rolling the steel in different conditions.
The different rolling schedules that are typically used are: 

• hot rolling

• thermo-mechanically controlled rolling

For the single steel chemistry shown below investigate how changing the rolling schedule can give you different final steel microstructures (in terms of ferrite grain size) and hence properties.

• Steel chemistry: 0.1 C, 0.2 Si, 1.0 Mn, 0.02 Nb wt %

• austenite full recrystallisation temperature range > 950°C

• austenite partial recrystallisation temperature range 820 - 950°C

• austenite non recrystallisation temperature range 780 - 820°C

• austenite and ferrite two phase field temperature range 730 - 850°C

Select the rolling schedule you wish to investigate:

• hot rolling

• thermo-mechanically controlled rolling