I'm restoring an antique cast iron stove that was apparently overheated at one time as one of four cast iron grates are bent. I'm wondering if I can place this bent grate into a charcoal fire till it's red hot, bend it straight, then return it to the fire and let it cool slowly as the fire cools over many hours? If not advisable is there an established proceedure for straighten deformed cast parts like that described above?