How to choose the temperature of the carbon silicon analyzer in front of the furnace

The analysis technology of the carbon silicon analyzer in front of the furnace is based on the solidification temperature curve of the formation process of cast iron structure. The instrument analyzes the solidification temperature curve and obtains the characteristic points of the curve under different compositions. Based on the characteristic points of the curve, the carbon equivalent CE%, carbon content C%, silicon content Si%, spheroidization rate SG%, tensile strength RM, eutectic degree SC, hardness HB and other properties of molten iron are calculated.

How to choose the temperature of the carbon silicon analyzer in front of the furnace:

1. If the pouring temperature of cast iron is too high, it can cause the sand mold to increase. In front of the furnace, especially for cast iron parts with complex sand cores, the amount of waste increases when the pouring temperature is ≥ 1420 ℃, and reaches 50% when the pouring temperature is 1460 ℃. In production, using induction furnace melting can effectively control the temperature of molten iron.

2. Defects that may form when the pouring temperature of the carbon silicon analyzer in front of the furnace is too low

1) After liquid slag inclusion processing, individual small holes will be found under the surface of cast iron parts, with a diameter of generally 1-3mm. In some cases, there are only 1-2 small holes. It is worth mentioning that changing the design of the pouring system failed to eliminate this defect, so this defect can be considered to be formed due to the low pouring temperature and the iron liquid pouring under a trace reducing atmosphere. Cast iron analysis instruments.

2) Manganese sulfide pores are located below and mostly above the surface of cast iron castings, and are often exposed after processing. The diameter of the pores is about 2-6mm. Sometimes there is a small amount of slag in the hole, and metallographic studies have shown that this defect is caused by a mixture of MnS segregation and slag, due to the low pouring temperature and high content of Mn and S in the molten iron.

3) Pores and porous pores caused by sand core gas are often caused by poor exhaust of the sand core. Because during core making, the sand core often hardens in the core box, which often results in insufficient exhaust holes for the sand core. To form an exhaust hole, additional drilling can be done after the core has hardened. The application of carbon and sulfur analyzers, etc. The most common reason for low pouring temperature is that the molten iron is transported and stays in the open ladle for a long time before pouring, resulting in heat dissipation. Using a ladle cover with insulation material can significantly reduce heat loss.