Usage method For 0-5 T furnace use: While a small amount molten iron in the furnace Or with some molten iron remained. add the carbon additive one-time Then add the other material Which can make carbon additive fully absorbed. For greater than 5 T furnace Mix proper carbon additive with charging material as suggested first, And then along with the increase of furnace charge down into the furnace inside gradually. That is, before the molten metal rising up to about 2/3 height of furnace All carbon additive shall be added It guarantees sufficient melting absorbing time before molten metal out, and improves the absorption of carbon.