Inverted Spheroidizing Method of Large Tonnage Ductile Iron

Abstract

The invention discloses a ladle-to-ladle nodulizing method for large tonnage nodular cast iron. The method comprises the following steps: firstly, adding a nodulizing agent to one side of a nodulizing bag dam, and then scattering a carburant and Sb on the nodulizing agent; covering the nodulizing agent with a nucleating agent and then compacting by using a steel plate, and covering the corner with scrap iron; secondly, adding a pretreating agent to the other side of the dam, simultaneously adding other alloys to the pretreating agent, putting into a pit and waiting for nodulizing; carrying out preheating treatment on a tundish A, raising the ladle temperature, and then discharging molten iron of a plurality of electric furnaces to the tundish A at one time by using the tundish B, scrabbling the surface slag and scattering a dreg remover to carry out heat preservation; thirdly, transferring to a region in which a nodulizing bag is arranged, putting the tundish so that the tundish is opposite to one side (with the nucleating agent) of the nodulizing bag, quickly crushing to carry out nodulizing, quickly removing the slag after reaction is ended, thoroughly removing the surface dross, and measuring the temperature. In order to prevent the slag from entering the molten iron along with the flow, the slag remover is scattered, and casting is carried out according to the casting temperature of the casting. According to the method, nodulizing is finished at one time by using the tundish, the nodulizing time is shortened, and the nodulizing quality is ensured.

Description

technical field [0001] The invention relates to a large-tonnage nodular cast iron back-packing spheroidization method, which is mainly used in the casting process of producing large-tonnage nodular cast iron to ensure the nodularization quality of the nodular cast iron and ensure that it meets the requirements of technical parameters. Background technique [0002] The traditional nodular cast iron water discharge method is the electric furnace single bag spheroidization method. The size of the electric furnace and ladle directly affects the single bag water tonnage. For large tonnage nodular cast iron castings, only multiple spheroidization methods can be used, which increases the spheroidization time and increases reduce the risk of global recession. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a large-tonnage nodular cast iron spheroidizing method, which uses a tundish to complete the spheroidizing method a...

AI Technical Summary

Problems solved by technology

[0002] The traditional nodular cast iron water discharge method is the electric furnace single bag spheroidization method. The size of the electric furnace and ladle directly affects the single bag water tonnage. For large tonnage nodular cast iron castings, only multiple spheroidization methods can be used, which increases the spheroidization time and increases global recession risk

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