Cast steel mouth heat preservation heat cover agent at the main use is??????

This product used for steel casting, sand common Ming riser and matters need attention, just take the mouth in molten steel can put on the cover to see agent, usage to see red advisable, as long as it doesn't burn saw red, can play a heat preservation effect, only use this product, need not take heat preservation can make take mouth shrinkage of mouth shape is "U" shape, flat, no secondary porosity, and fill shrink efficiency reached 30%, rising head weight reduction of 50-75%, due to take the coagulation time significantly prolongs the mouth (for ordinary sand add plant ash process of mouth at 1. Six times), is very helpful in the casting of gas, inclusion floatation and improve the internal quality castings.