Hello everyone, I am the youngest girl in the factory.

A netizen sent me a private message in the background about 

common problems in induction furnace smelting. 

O in the molten iron is too high, what should I do?

In fact, the induction furnace does not have the oxidizing atmosphere of the cupola, 

and due to the reaction between [O] and [FeO] in the molten iron and [C], 

Fe is protected by C, and there is not much dissolved oxygen in the molten iron. 

However, in the later stage of smelting, 

in order to promote the dissolution and absorption of the C-enhancing agent, 

the electric frequency is often lowered to enhance the agitation of the molten pool. 

If the "hump" is too high and the frequency modulation time is too long, 

the probability of contact between the molten iron and the atmosphere increases, 

and the dissociated O ions will enter the molten iron. 

Additives in the later stage of smelting are not baked, which will also increase [O] and [H].

Recently, some people in the industry put forward the view that [O] will not decrease 

but increase when the temperature is kept above 1500 ℃, 

which can be used for reference. The way to prevent O from being too high is:

  (1) Do not overly adjust the frequency in the later stage of smelting.

  (2) Do not use wet materials and tools in the later stage.

  (3) The overheating temperature should not be too high, 

and it should not be kept under high temperature for a long time.