1. The pouring temperature is too high will greatly improve the scrap ratioPouring temperature is too high will cause sand mold up big, especially the grey cast iron parts with complex cores, when pouring temperature is 1420 ℃ or higher scrap, scrap 50% when pouring temperature is 1460 ℃ in production, using induction furnace melting can well control the temperature of molten irons.1. The casting defects may be formed, when the temperature is too low(1) manganese sulfide porosity such porosity below the gray cast iron pieces of epidermis and above, more often emerge after processing, pore diameter of 2 ~ 6 mm.Sometimes hole contains a small amount of slag, metallographic studies show that the defect is made from a mix of MnS segregation and slag, reason is the pouring temperature is low, at the same time, the Mn and S content in liquid iron.Such S content and appropriate Mn content (0.5% ~ 0.65%), can significantly improve the purity of molten iron, so as to effectively prevent this kind of defect.
The text - transform: none;The font - style: normal;The font - size: 12.0000 pt;The oledata.mso - the font - kerning: 1.0000 pt;">Such S content and appropriate Mn content (0.5% ~ 0.65%), can significantly improve the purity of molten iron, so as to effectively prevent this kind of defect.