What are the factors that affect the effect of graphite spheroidization? (4)
Many users want to know the circuit production of
nodular cast iron influence graphite spheroidization effect by what factors?
Eight, the influence of spheroidizing agent size
The size of spheroidizing agent should be 5-25mm
for 150-750kg/bag of molten iron,
and larger size spheroidizing agent should be
applied if the size is greater than 750/ bag.
The nodulizing agent pool or the bottom of the nodulizing agent is
often concentrated with small particle size nodulizing agent,
in this case, it should be used together with...
Various factors affecting the spheroidization effect of graphite
Today we continue to talk about several factors that affect the effect of
graphite spheroidization in the production of ductile iron
Four, the influence of the temperature of molten iron:
the temperature of molten iron increases by 20-25 degrees,
you need to add 0.10% spheroidizing agent.
Five, the influence of pouring time: pouring time mainly affects
the gestate decline and the spheroidization decline of MG evaporation,
and the evaporation decline of MG with large diameter is fast.
High NI hot iron treatment after 8 minutes of hot iron must be...
There are four factors that affect the graphite spheroidization of electric furnace.
In this video, we are going to talk about the effect of
spheroidization package on the graphite spheroidization of
ductile iron produced by electric circuits
three. Influence of spherification package:
a. The height to diameter ratio of the spheroidized package
should be controlled between 1.5 and 2.
b. The size of the spheroidized bag should be controlled between
70% and 75% of the height of the spheroidized bag.
c. The spheroidization chamber should be made into a round or
elliptical shape to ensure that the amount of iron...
Chemical composition and inoculation treatment will affect the spheroidization effect of graphite produced by electric furnace.
I am the youngest girl in the factory.
Many users want to know the circuit production of
nodular cast iron graphite spheroidization effect,
in the end what factors affect. The next few videos,
I will give you a summary, remember to leave a comment.
First, the influence of chemical composition:
the influence of graphite spheroidization of
chemical elements in molten iron has the following:
Mg, S, Ce, O, Ti, Al, Sb, but the number of balls
is best controlled in 100~300 per square millimeter,
too high number of balls will make graphite...
Do you know how many typical metallography nodular cast iron has?
Today, I will take you to continue to understand
the metallographic adverse reactions of ductile iron
three, grass graphite: mainly because the low melting point alloy
in the final solidification site segregation.
Therefore, by increasing the number of graphite,
making graphite spheres evenly distributed,
shortening the distance between spheroidal ink,
so as to reduce the segregation tendency.
four, graphite ball is not round: mainly because of gestation recession,
high temperature, long holding time,
the original molten iron white...
Do you know what the surface reaction layer, the metallography of linear graphite looks like?
I am the youngest girl in the factory.
Today, I will take you to continue to understand
the metallographic adverse reactions of ductile iron
six, surface reaction layer: mainly because of molding sand,
coated sand containing N, S, O amount is too high.
The content of Mg and rare earth in molten iron is low,
the pouring temperature is high, the heat dissipation is slow here,
the casting structure and the casting fillet are too small.
Therefore, it is necessary to use the nodule agent with
high Mg content and RE content.
Use alkaline...
The properties of wormlike graphite, lumpy graphite, let me tell you.
There are seven kinds of typical poor metallurgical phenomena in ductile iron,
they are worm-like graphite, lump-like graphite,
grass like graphite, graphite ball is not rounded,
graphite floating, surface reaction layer, linear arrangement of graphite.
In today's episode, I'll focus on the first two phenomena.
one, worm-like graphite: mainly because the spheroidization process is not good,
residual Mg, residual RE amount is insufficient.
The holding temperature is too high or the holding time is too long.
The original molten iron has a high content...
Smelting is very important in the casting process.
Hello everyone, I am the youngest girl in the factory.
In the casting process, the purpose of smelting has three points:
(one) In order to obtain an alloy with a uniform chemical composition
and meet the requirements:
the structure and properties of the alloy material,
in addition to the influence of the process conditions,
must first be guaranteed by the chemical composition.
If a certain component or impurity exceeds the standard,
it will be treated as chemical component waste,
resulting in great losses.
(two) Alloy melts with high purity...
How to improve the performance of gray cast iron several ways.
There are five main ways to improve the performance of gray cast iron，
Here we focus on the first way - the role of increasing the Si/C ratio:
one. The amount of pre-analyzed austenite increases,
which has the effect of strengthening the matrix;
two. The amount of graphite is correspondingly reduced,
which reduces the reduction and cutting effect of graphite;
three. The content of silicon in solid solution in ferrite increases,
which strengthens ferrite;
four. Due to the increase of silicon,
the white mouth tendency of molten iron is reduced;
five. The...
Three stages, take you through the graphitization process
Hello everyone, I am the youngest girl in the factory.
Let me popularize with you:
the influence of graphite and matrix in ductile iron
on the performance of ductile iron.
We all know that cast iron contains graphite,
and the graphite in gray cast iron and white cast iron is distributed in flakes,
which has a cutting effect on the matrix structure of cast iron
and reduces the mechanical properties of cast iron.
The graphite in the ductile iron is spherically distributed,
and the cutting and splitting effect on the matrix structure is much...
Effect of graphite and matrix on properties of nodular cast iron
Hello everyone, I am the youngest girl in the factory.
The formation process of graphite in cast iron is called graphitization process.
This process can be divided into three stages:
The first stage is the liquid phase hypoeutectic crystallization stage.
Including, directly crystallizing primary graphite from
the liquid phase of hypereutectic composition,
crystallizing austenite plus graphite from the liquid phase of eutectic composition,
formed by the decomposition of primary cementite and
eutectic cementite during high temperature annealing of...
On the role and function of boron, copper, rare earth, nitrogen, sulfur and phosphorus in steel
Today, let's continue to popularize the role
and function of various chemical components in steel.
13. Cu: The prominent role in steel is to improve
the atmospheric corrosion resistance of ordinary low-alloy steel, especially
when used in combination with phosphorus,
adding copper can also improve the strength and yield ratio of steel,
and it has no adverse effect on welding performance. .
14. B: Adding a small amount of boron to the steel
can improve the compactness and hot rolling properties of
the steel and increase the...
The necessity of zirconium, silicon, manganese and aluminum in steel
Today, let's continue to popularize the role
and function of various chemical components in steel.
9. Zr: Adding a small amount of zirconium has the effect of degassing,
purifying and refining grains,
which is beneficial to the low temperature performance of steel
and improves the stamping performance.
It is often used in the manufacture of
ultra-high-strength steel and in nickel-based superalloys.
10. Si: It can dissolve in ferrite and austenite to
improve the hardness and strength of steel,
and can reduce the density,
thermal...
What do you know about the role of tungsten-vanadium titanium niobium cobalt?
Today, let's continue to popularize the role
and function of various chemical components in steel.
4. W: The main function of tungsten in steel
is to increase tempering stability, red hardness,
thermal strength and wear resistance due to the formation of carbides.
Therefore, it is mainly used for high-speed steel,
tool steel such as hot forging die steel,
and wear-resistant steel.
5. V: Vanadium can refine grains in ordinary low carbon alloy steel,
improve the strength and yield ratio after normalizing
and low temperature...
The 18 elements in low alloy steel
Hello everyone, I am the youngest girl in the factory.
Today we will systematically talk about
the role of the 18 elements contained in steel.
1. Cr: In structural steel and medium,
chromium can significantly improve strength,
hardness and wear resistance,
but at the same time reduce plasticity and toughness.
Chromium can also improve the oxidation resistance
and corrosion resistance of steel,
so it is an important alloying element of stainless steel
and heat-resistant steel.
2. Ni: It can improve the strength of steel
while...
How much do you know about rapid solidification?
Rapid solidification refers to the solidification process in
which a high solidification front advancement rate is obtained
by using quenching technology or supercooling technology.
Compared with the general solidification process,
rapid solidification technology has great appeal in both process
and material, mainly in the following three aspects:
(1) Expand the solubility of the solute in the alloy,
resulting in the formation of supersaturated solid solution,
non-equilibrium crystal and amorphous, respectively.
(2) Homogenize and refine the...
Do you really understand the formation and effects of inclusions
In this video, let's talk about the "formation and impact of inclusions"
Inclusions mainly come from two aspects:
one is the impurities in the charge, its own impurities;
the other is the reaction product between the reaction product
of the smelting process and the surrounding medium.
Inclusions have the following effects on metal properties:
one. Inclusions destroy the continuity of the metal
and reduce the strength and plasticity;
two. Sharp-angled inclusions are easy to cause stress concentration
and significantly reduce impact toughness and fatigue...
Through the formation and control of stomata, teach you to recognize the classification of stomata
Hello everyone, I am the youngest girl in the factory.
Porosity is one of the most common defects in castings.
Today we will learn about: classification,
formation and control of stomata.
Stomata are generally classified into precipitation stomata,
intrusive stomata and reactive stomata.
One, in the process of cooling and solidification of liquid metal,
due to the decrease of gas solubility,
the pore formed by the precipitation gas too late to escape
is called precipitation pore.
Such pores are mainly hydrogen pores and nitrogen pores,
which...
Three categories teach you to understand the casting solidification mode
Today, we want to share with you in our Difeng small class is:
"casting solidification method".
According to the width of the solid-liquid two-phase region,
the solidification methods of castings
can generally be divided into three types:
When the solid-liquid two-phase region is very narrow,
it is called layer-by-layer solidification,
otherwise it is mushy solidification.
0ne. The alloys that are solidified layer by layer
have better feeding properties,
are not prone to thermal cracking,
and are easy to obtain dense...
Revealed: Customer satisfaction spheroidizing agent product production process
Today, let's take a look at how Nanjing Difeng's
spheroidizing agent controls the quality in production,
so that customers can receive satisfactory products.
First of all, we came to the raw material storage warehouse.
These are ferrosilicon, magnesium, rare earth, calcium, etc.,
and they all come from the origin of regular big factories.
It can be said that the quality of Nanjing Difeng
is guaranteed from the beginning of the raw materials.
Here is the production workshop.
The master is adding raw materials with
a good proportion to...
(3) To control the production quality of spheroidizing agent from chemical composition inspection
Q: How to control the production quality of nodulizer?
I just summarize a few points:
(one) The affinity of spheroidizing elements with elements
such as sulfur and oxygen in molten iron.
It has a strong affinity and forms compounds with it,
as a foreign core in the solidification process of molten iron,
such as rare earth, magnesium,
calcium and other spheroidizing elements.
(two) The ability of spheroidizing elements to change
the shape of graphite from flake to spherical.
(three) The density and boiling point of the nodulizer
are lower...
