How to solve the "interference elements" that affect production
Hello everyone, I am the youngest girl in the factory.
With the development of my country's industry,
the quality requirements of various castings are increasing day by day,
and the influence of interfering elements brought by the charge
has gradually become a problem that everyone has to face.
Today we mainly talk about the interfering elements in cast iron.
Phosphorus, sulfur and other harmful elements
and other interfering elements contained in pig iron for
steelmaking can be removed in the subsequent steelmaking process,
while cast iron is only...
What "interfering elements" appear in the smelting of gray and ductile iron?
Hello everyone, I am the youngest girl in the factory.
"Interfering elements" are those that have a negative effect
on the properties of gray cast iron and ductile iron,
and are not necessarily the so-called harmful elements.
There are three sources of interference elements:
One is the harmful elements usually contained
in steel castings and iron castings,
such as sulfur, phosphorus, lead, etc.;
The second is alloying elements specially added to
improve the properties of steel,
such as manganese,...
The foundry is a day trip
Hello everyone, I am the youngest girl in the factory.
Nodulizer is an additive that can promote
the crystallization of graphite in ductile iron into spherical shape.
The rare earth magnesium ferrosilicon nodulizer is
commonly used in my country.
Now the factory is crushing the spheroidizing agent that
has just been cooled into a solid.
This is the broken spheroidizing agent.
It will be sampled by the laboratory later.
After all the inspections are passed,
it will be sent out in a packaging truck~
Nanjing Difeng's nodularizers strictly...
Understand the whole production process of spheroidizing agent
Uniform particle size, no ash and no slag,
export goods, quality assurance
Hello everyone, I am the youngest girl in the factory.
Nodulizers are certain metals or alloys
added to molten iron to obtain spheroidal graphite cast iron.
Rare earth magnesium ferrosilicon nodularizers
are commonly used in China.
Nanjing Difeng's spheroidizers all strictly implement the
ISO9001:2015 international quality system standard.
While creating high-quality alloy products,
we can also provide customers with various special requirements
for new...
Suitable for their own spheroidizing agent to choose how?
Hello everyone, I am the youngest girl in the factory.
There are 6 basic points for choosing a suitable spheroidizer,
and today we will talk about the remaining three points;
4. Handling weight
If the weight of the molten iron after treatment is less than 500 kg,
a spheroidizer with a smaller particle size can be used.
It is recommended to use a spheroidizer with a particle size below 12MM.
If the weight of the molten iron after treatment is 500 ~ 1000 kg,
a nodulizer with a larger particle size can be used,
such as a particle size of 5 ~ 25MM.
If the...
There is no best spheroidizing agent, only the most suitable for their own
How to choose a suitable nodulizer?
6 basic points to keep in mind：
spheroidizing temperature,
treatment bag size, spheroidizing process,
treatment weight, silicon content,
sulfur content in the original molten iron;
1. Spheroidizing temperature
If the spheroidization temperature is higher than 1480℃,
the spheroidization reaction will be more intense,
resulting in a decrease in the magnesium absorption rate.
In order to make the spheroidization reaction proceed smoothly,
a spheroidizer with relatively high calcium content can be...
The foundry's daily work, for the foundry's praise!
Last month was our safety production month.
Because of the reduced workload involved in employee training and learning,
factory orders will also be reduced accordingly.
This month,
the factory will return to the daily schedule for overtime work again.
Walk! Come with me to see the production workshop of nodularizer.
I heard that orders for a few carts of
spheroidizers and ferrosilicon will be sent out today.
Now the production master will add well-matched raw materials
to the intermediate frequency induction furnace.
After melting to a...
Three common inoculants
Today I will introduce to you some commonly used inoculants~
1. Silicon barium inoculant
Silicon barium inoculant is the most commonly used inoculant
in the foundry industry at home and abroad.
The constituent elements are silicon,
calcium, barium, aluminum, etc.
Barium has a good deoxidation effect
and forms stable compounds with oxygen.
Production practice shows that the low-barium silicon-barium inoculant
has much stronger graphitization
and anti-recession ability than 75# ferrosilicon.
The silicon-barium inoculant improves the cutting...
Inoculation treatment must have a suitable inoculant
Inoculation treatment must have a suitable inoculant!
The inoculant is a kind of inoculant that 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.
To be suitable for castings or post-inoculation in various situations,
silicon strontium inoculants play an important role
in the production of high-grade iron castings:
The silicon strontium inoculant has the effect of delaying the diffusion
of carbon and...
What are the advantages of silicon strontium inoculants
Today we will talk about:
the advantages of silicon strontium inoculants
Cast iron is an iron-carbon alloy with
a carbon content greater than 2.1%,
and gray cast iron is a kind of cast iron.
The graphite in gray cast iron is lamellar,
and the fracture is dark gray.
The main components of gray cast iron are iron, carbon, silicon,
manganese, sulfur, and phosphorus, and the cost is low,
and the casting performance and performance are good.
Its output accounts for more than 80% of the total output of cast iron.
With the development of...
Safety in production is a great responsibility
Safety production responsibility is heavier than Mount Tai,
and doing a good job in safety production has
great responsibility and great significance.
Hello everyone, I am the youngest girl in the factory.
June is our "Safety Production Month".
Regarding the issue of safe production,
Nanjing Difeng always puts it first!
In order to "strictly implement the main responsibility of safety production
and vigorously improve the intrinsic safety level of enterprises",
the first thing to do is to firmly establish a correct safety concept:
Intrinsic safety...
Let's look at the production process of silicon and strontium inoculants
Hello everyone, I am the youngest girl in the factory.
Recently, orders have increased.
This is the produced silicon zirconium inoculant and silicon strontium inoculant,
which will be loaded and sent to customers soon.
Now the masters are producing orders for silicon strontium inoculant.
Come, let's take a look at the production process of
silicon strontium inoculant with me.
In the process of casting,
the silicon strontium inoculant plays a role in strong inking,
and its inking ability is significantly better than 75...
How to choose inoculant, such as when to choose silicon zirconium inoculant?
Q: How to choose an inoculant,
such as when to choose a silicon-zirconium inoculant?
The molten iron inoculation treatment is to add an inoculant to
the molten iron to change the metallurgical state of the molten iron
before the molten iron enters the casting cavity,
thereby improving the microstructure and properties of the cast iron.
Changes in the chemical composition of the molten iron
after the injection can be explained.
With the improvement of inoculation methods,
inoculation treatment has become an important means...
What about the safety of the factory?
Safe production starts from Nanjing Difeng
In the past two weeks, we have been doing safety inspections.
Usually factory production,
safety production ranks first,
to build a safe workplace for everyone.
For safe production,
we have made four requirements at Nanjing Difeng:
1. Do a good job in safety training,
improve the safety awareness of employees,
always have safety in mind,
always follow safety in operation,
and prevent the occurrence of safety accidents from the source.
2. Keep the production equipment in good operating...
Casting knowledge: the use of silicon strontium inoculant
Question: When is the silicon strontium inoculant mainly used?
Silicon strontium inoculant is suitable for thin-walled or
chilled high-sulfur and low-sulfur gray iron parts,
and can also be used in ductile iron to increase the number of ductiles,
especially high-nickel corrosion-resistant ductile iron
(containing Ni 14%, Cu 6%, Cr 2%, Si 1.5%).
It is also suitable for gray iron castings that require dense castings
without porosity and water pressure resistance.
Silicon-strontium inoculant,
also known as silicon-strontium...
The production loss can be avoided if the spheroidizing agent is used correctly
Hello everyone, I am the youngest girl in the factory.
Recently, many netizens have privately messaged me,
wanting to see our spheroidizer.
Today, I came to the factory to show you our spheroidizer.
We have been in the alloy service industry since 2006,
which is 20 years old.
This is a nodularizing agent for cast iron that we have just produced.
It is an alloy made of ferrosilicon, calcium, magnesium,
rare earth, etc. through melting,
and has strong deoxidation and desulfurization effects;
Our nodulizer has stable composition control,
low...
Would you like to know what common spheroidizing agents are
Q: What are the common nodularizers?
Nodulizers mainly include magnesium-silicon alloys,
rare-earth magnesium-silicon alloys, calcium-based alloys,
nickel-magnesium alloys, pure magnesium alloys,
and rare-earth alloys.
Among them, rare earth magnesium ferrosilicon alloys are widely used.
Calcium magnesium nodularizers are mainly produced and applied in Japan.
Such alloys have a small tendency to white mouth,
but require high processing temperature
and large amount of slag after processing.
In addition to ferrosilicon rare...
In the summer, there is no word "easy" next to the casting machine
Summer is here, Nanjing is already over 30 degrees Celsius.
Today, I will take you to the factory to experience the summer
workshop work of the casting people in an immersive experience~
The temperature here averages around 42 degrees Celsius in summer,
and it's already hot outside, but it's noticeably hotter here.
Next to the casting machine is the place with the highest temperature.
The molten iron inside has a high temperature of
more than a thousand degrees.
The workers repeat the process that has lasted for several hours
at high...
What can sulphur and oxygen play in cast iron?
Question: What is the role of S and O in cast iron?
S and O are added to the cast iron melt in order to
make the melt more sensitive to inoculation.
In ductile iron production,
the melt is Mg-treated with pure Mg or MgFeSi in subcontracting.
The purpose of this treatment is to suppress
the surface active elements S and O,
thereby changing the growth morphology of graphite from flake to spherical.
If the content of S and O in the melt is very high,
in order to obtain ductile iron,
it is necessary to add more Mg before spheroidizing...
Nanjing DiFeng strictly controls every part of the production of pregnancy and breeding blocks
Hello everyone, I am the youngest girl in the factory.
Recently, orders have increased,
especially orders from foreign customers.
The production schedule of the factory is very full.
Now the masters are producing orders from foreign businessmen,
which is a batch of inoculation blocks.
Here is the molten iron that has been fired,
and the masters use specially customized steel molds for pouring.
We have to wait for the mold to cool down.
After cooling, start to manually knock
the sanding tool to knock out the inoculum
Now the masters are doing...
What is a creep cast iron
Q: What is vermicular graphite cast iron
The tensile strength of vermicular graphite cast iron is
70% higher than that of gray cast iron,
slightly lower than that of ductile iron,
and it is an excellent material for structural parts.
In compacted graphite cast iron,
the number of graphite pellets increases,
the creep rate decreases, the strength and elongation increase,
and the thermal conductivity and shrinkage rate will deteriorate.
At present, the matrix of vermicular graphite iron
is still limited to ferrite and pearlite.
The...
