The chemical composition of the steel is different from that of austenite in the temperature range of 950 ~ AR3. The main feature of rolling in the unrecrystallized zone is that the chemical composition of the steel is not the same as that of the austenite non-recrystallized zone.
In the rolling process, there is no occurrence of austenite re-crystallization.
ASTM a516 gr.70 steel plate increases there crystallization temperature of austenite with NB. Therefore,ASTM a516 gr.70 steel plate. The second open rolling temperature of ASTM a516 gr.70 steel plate is 9.50 ℃. Final rolling temperature control At 800 ~ 870 ℃, the thickness of steel plate is reduced to 16 mm, and the upper temperature limit of finish rolling is obtained. When the thickness is more than 16 m m, the middle and lower limit of finish rolling temperature is obtained.
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