What is the temperature needed for preheating in cast irons?

• A. 550¬¨¬®‚Äö√†√ªC
• B. 600¬¨¬®‚Äö√†√ªC
• C. 650¬¨¬®‚Äö√†√ªC
• D. 700¬¨¬®‚Äö√†√ªC