In induction furnace smelting, the amount of carbon in molten iron is lower than expected, how to solve it?
Hello everyone, I am the youngest girl in the factory.
Sometimes the spheroidization grade of ductile iron fluctuates greatly,
mostly because the S content of the original molten iron fluctuates,
and the spheroidization is naturally unstable.
As an example, there is a township enterprise that
used a cupola furnace to produce low-chromium grinding balls,
but later switched to an induction furnace
and took over the task of ductile iron.
However, the furnace is used together,
neither the furnace body is used separately, nor the furnace...
Nanjing Difeng casting products are sent to the whole country
Hello everyone, I am the youngest girl in the factory.
The factory is my home, development depends on everyone.
The stove behind me has not stopped except for normal maintenance
since it came back from construction this year,
and it has been working.
We are the source factory that has been in Nanjing for more than ten years.
We mainly produce cast iron spheroidizers, inoculant blocks, inoculants and other products.
Products are sent to all parts of the country and to the United States, Britain,
Germany, France, Canada, Australia, Brazil, South...
How to solve the poor inoculation effect of gray cast iron
Hello everyone, I am the youngest girl in the factory.
Some netizens asked me privately,
how to solve the poor breeding effect of gray cast iron?
The basic solution is to use FeS-based S-increasing agent to
increase S to 0.07% to 0.10%.
A small number of factories also add O agents in the later stage,
such as sponge iron or sintered iron or chips,
so that [O] can reach more than 30ppm.
There are also factories that use oxygen-sulfur inoculants.
These methods are nothing more than generating oxysulfides,
which act as graphite cores.
Follow me, the...
Our silicon-barium inoculant can promote graphitization when added to molten iron
Hello everyone, I am the youngest girl in the factory.
This is the just-produced inoculant,
which is supplied to various foundries in Changzhou.
Adding our silicon-barium inoculant to the molten iron
after spheroidization can promote graphitization,
reduce the tendency of white mouth,
improve the morphology and distribution of graphite,
increase the number of eutectic groups,
and refine the matrix structure.
It has a good effect in a short time after treatment.
We have high cost performance and stable production capacity,
and can also...
The amount of molten iron carbon is lower than expected, how to solve it?
Hello everyone, I am the youngest girl in the factory.
Welcome to Nanjing Dyfeng Small Classroom. In the last issue,
we talked about the high O in the molten iron in the induction furnace smelting,
what should I do?
Today, let's talk about the amount of molten iron C that is lower than expected.
How to solve it?
Usually, when the temperature of molten iron exceeds the equilibrium temperature,
the reaction SiO2+2C=Si +2CO proceeds to the right,
resulting in the decrease of C and the increase of Si in the molten...
O is too high in molten iron, what should I do?
Hello everyone, I am the youngest girl in the factory.
Welcome to Nanjing Difeng Foundry Small Classroom.
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...
How to prevent the phenomenon of low creep rate?
Hello everyone, I am the youngest girl in the factory.
When many factories produce vermicular graphite iron castings,
there will be a phenomenon of low creep rate.
How to prevent it?
Today I will teach you three practical tips:
1. The quantification of vermicularizing agent and molten iron
should be accurate
2. Master and stabilize the sulfur content of the original molten iron
3. Strictly master the composition of vermicularizer
and manage it properly
If it is judged that the treatment is too much before the furnace,
you can add the original...
Seven points to understand what is worming
Hello everyone, I am the youngest girl in the factory.
When many factories produce vermicular graphite iron castings,
there will be a phenomenon of low creep rate.
How to prevent it?
Today I will teach you three practical tips:
1. The quantification of vermicularizing agent and molten iron
should be accurate
2. Master and stabilize the sulfur content of the original molten iron
3. Strictly master the composition of vermicularizer
and manage it properly
If it is judged that the treatment is too much before the furnace,
you can add the original...
Four points to master how to identify whether the creep rate is low?
Hello everyone, I am the youngest girl in the factory.
In the production of vermicular graphite iron castings,
excessive treatment, too much creeping agent or small amount of
molten iron will easily lead to the phenomenon of low creeping rate.
How to interpret whether it is a low creep rate?
There are four judgment methods,
and now I will share them with you.
1. The triangular test piece in front of the furnace
has a thin fracture and is silver-gray
2. Severe shrinkage on both sides or central shrinkage
3. Metallographic structure of castings:...
In addition to the problem of creeping treatment, what are the problems of vermicular graphite iron castings?
Hello everyone, I am the youngest girl in the factory.
What are the problems of vermicular graphite iron castings?
Creeping failure, low creeping rate, creeping recession,
excessive white mouth, inoculation recession, graphite floating,
flaky graphite layer on the surface, slag inclusion, etc.
are all existing in the production of vermicular graphite iron castings some defects.
Usually, the cause of these defects is not only the problem
of creeping treatment,
but sometimes there are also many production process problems
such as molding core...
A batch of 3 specifications of products, how do the masters solve it?
Hello everyone, I am the youngest girl in the factory.
Behind me are the masters who are loading the qualified products,
and this batch of goods will be sent to Hebei soon
This order contract customer needs a batch of 3 specifications of products.
Come, follow me to see how the masters solve it.
The masters are adding materials to the medium frequency induction furnace,
Now the laboratory technician is testing this batch of products.
Look, this is made to order
This is the report that has just been detected, and the product
is in full compliance with the...
Revelation: A day in the life of a casting man
Hello everyone, I am the youngest girl in the factory.
It is 9 am and colleagues in various departments have already started work.
1. Now it is the production workshop.
The masters are producing the nodularizing agent.
According to the needs of the order,
the masters need to produce the T-1 nodularizing agent.
2. It is now a crushing workshop,
currently processing nodulizers and inoculants
4. Here is the finished product workshop,
where the masters are repacking qualified products.
These products will be dispatched as soon as possible
and...
It's been a month since the start of construction, and the masters have been busy shipping, hard work!
Hello everyone, I am the youngest girl in the factory.
It has been a month since construction started,
and the masters in the production workshop
have been processing and producing these days.
Let's go and see.
Now the master is adding materials in the induction furnace. According to the customer's demand,
this time the production is nodularizing agent.
Now what is crushed on the crusher is the spheroidizing agent inoculant.
According to the demand of the order,
we will crush the product into various particle sizes required by the...
Send samples for inspection, and the test results show...
Hello everyone, I am the youngest girl in the factory.
Do you want to know what the lab lady is doing every day?
Let's go, I'll show you.
We randomly sampled samples,
and now I will send this part of the sampled samples to
the laboratory for testing.
Now the laboratory lady is testing this batch of sampling products to see
if they meet the customer's production needs,
and the machine has begun to report.
Let's take a look at this report and look at the data here.
This value shows that our product is completely OK.
Friends who have related...
The reason for the small number of graphite balls and the uneven size of the ball diameter
Hello everyone, I am the youngest girl in the factory.
Today, I will tell you how to deal with the small number of
graphite balls and the uneven diameter of the balls.
If there is nodular graphite, the residual Mg content is no problem.
The problem is that the breeding is not good or the breeding is declining.
If the casting does not produce white mouth,
it means that the breeding gap is not big.
From the point of smelting, the graphite core should be controlled with
artificial graphite C increasing agent.
Industry insiders recommend that SiC...
Four reasons for how to reduce the burning loss of induction furnace
Hello
everyone, I am the youngest girl in the factory.
To reduce
the burning loss of the induction furnace,
the
following points should be specially reminded:
(1) It is
best to put clean materials into the furnace,
and it is a
taboo that the furnace materials are dirty and miscellaneous.
(2) A
high-power furnace is used,
supplemented
by a reasonable charging operation to achieve rapid smelting.
It is
especially important to shorten the melting period
and prevent
overheating of the bottom of the furnace.
(3)...
In 2022, Nanjing Difeng will start construction
Hello everyone, I am the youngest girl in the factory.
Nanjing Difeng production line has started.
At present, the masters have successively returned to the production line
and started to make products according to the order.
Our masters are professional, dedicated and careful to
pay attention to each process link.
Look! This is the product that has been produced.
After the production of these products is completed,
we will send the sampling sample to the laboratory for testing.
At present, the products have been tested to meet
the...
The experienced masters of Nanjing Difeng are experienced
Hello everyone, I am the youngest girl in the factory.
This is the quality inspector master in our factory.
He has been doing it for almost ten years and is a master.
The final manual screening of the inoculum is now underway.
Pick out the inoculated blocks with hollow in the middle
and bad appearance to avoid sending substandard products to
customers to the greatest extent.
Our quality inspector is a "veteran",
serious and careful, sharp-eyed and quick-witted.
He said: My attitude towards...
We are professional in the manufacture of spheroidizers and inoculants!
Hello everyone, I am the youngest girl in the factory.
Do you remember what our company does?
We Nanjing Difeng has a complete and scientific quality management system.
Our factory can produce nodularizing agent, inoculant,
creeping agent, steel-making deoxidizer, cored wire, etc.
according to the needs of customers' orders.
This is our production workshop, this is the dysprosium laboratory,
do you still remember this machine?
Whether our products are qualified or not is tested by it.
This is our raw material storage warehouse.
Summarize Nanjing...
When you encounter these phenomena, it is very likely to be pregnant with recession!
Hello everyone, I am the youngest girl in the factory.
It's time for our popular science class again.
Today, let's talk about "breeding recession".
Fertility decline is generally manifested in the following phenomena:
1. The increase in the degree of eutectic undercooling
leads to an increase in the tendency of cast iron to turn white.
2. The number of eutectic groups is significantly reduced.
3. Graphite type changes.
4. The sensitivity of the casting structure to the section is...
The method of molten iron treatment before the furnace - alloying
Hello everyone, I am the youngest girl in the factory.
Welcome to my small science class.
Today we will talk about alloying
Commonly used alloying elements for cast iron are
Si, Mn, Cu, Cr, Mo, Ni, Sn, Sb, V, Ti, P, etc.
Among them, Si, Mn, Cr, Mo, and P are added in the form of iron alloys,
Cu, Ni, Sb, and Sn are added in the form of metals, and V and
Ti are added in the form of iron alloys or VTi pig iron.
The timing of the addition is after the furnace (cupola),
in the furnace (induction furnace) or before the furnace,
depending on...
