In this test, 50KW medium frequency induction furnace is used for smelting, and each group of charge is 25kg.
Proportioning principle: proportioning shall be carried out according to the actual requirements for the production of low carbon equivalent gray cast iron of corresponding brand. Raw pig iron, scrap steel and ferroalloy commonly used in production shall be selected as raw materials, and the chemical composition shall be determined by the chemical composition requirements of corresponding brand.
- The gray cast iron scheme is proportioned according to the composition requirements of HT250, CE is about 3.78%, and the wall thickness is less than 30mm.
- Chemical composition of gray casting molten iron.
- Gray cast iron charge includes primary iron Q12, scrap steel, fesi75 and femn75. The chemical composition of the charge and the burning loss rate of main elements in the charge.
- Use the selection method for batching, and the preliminary mix is as follows (the iron material is calculated as 25kg): 75% of Q12 pig iron and 25% of scrap steel.
- Carbon content required for gray cast iron charge: