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Causes of Loose casting (below)
Causes of Loose casting (below)
Hello everyone, I am the youngest girl in the factory. Today, let's talk about it: the inoculant for  our king fried products from Nanjing Difeng. At present, there are about 200 kinds of inoculants,  and there are more than 30 kinds of commonly used inoculants.  It is necessary to choose suitable inoculants for castings of different materials.  The wrong choice will cause some casting defects. The types of inoculants are as follows: 1. Classification according to ingredients: silicon-based inoculants,  carbon-based inoculants, rare earth inoculants, etc.; 2....
Causes of Loose casting (Part 1)
Causes of Loose casting (Part 1)
Today, a foundry in the Hangzhou area encountered  the problem of loose castings.  The casting in question is a motor base product,  the material is required to be 250 grades,  the weight is 47 cents, the height is 47 cm,  and the wall thickness is 30 mm at the thick wall  and 7 mm at the thin wall. According to the manufacturer's response,  the casting has always been loose in the thick wall recently,  and there is leakage under pressure. In the production of gray cast iron,  white defects of thin-walled parts and loose defects  of...
Nanjingdifeng covered agent, you can choose at different particle size!
Nanjingdifeng covered agent, you can choose at different particle size!
Hello everyone, I am the youngest girl in the factory. Recently, many netizens have privately messaged me,  wanting to see the covering agent in our family.  Today, I will come to the factory to show you. This is our all-covering agent product.  Due to its pure composition, reasonable and moderate specific gravity,  and strict particle size range,  our covering agent can greatly stabilize  the spheroidization process when used,  and can significantly improve the recovery rate of magnesium. In addition, the covering agent is also conducive...
What are the other problems of vermicular graphite cast iron besides creep treatment?
What are the other problems of vermicular graphite cast iron besides creep treatment?
Q: In addition to the problem of creeping treatment,  what are the other problems of vermicular graphite iron castings? Hello everyone, I am the youngest girl in the factory.   In the production of vermicular graphite iron castings,  common casting defects include general defects of gray iron castings,  failure to creep, low creep rate, creep recession,  excessive white mouth, inoculation recession,  graphite floating, surface flakes Graphite layer,  slag inclusion, etc. one, can't creep If the triangle test piece in front of the furnace is found to...
Four suggestions to help you choose good quality spheroidizing agent
Four suggestions to help you choose good quality spheroidizing agent
Q: How to choose good quality spheroidizer? A good nodularizer is mainly reflected in the following points: One, has a good affinity with sulfur and oxygen in molten steel,  and the reaction is small when placed in molten steel,  but the deoxidation effect and desulfurization effect are good! Two, a good nodulizer can effectively improve  the graphite shape of cast iron.  In the cast iron industry, this role is particularly important.  Putting a good nodularizer in molten iron  can make the graphite shape gradually change from flake.  It is...
Do you want to know how to improve the spheroidization rate of nodular cast iron?
Do you want to know how to improve the spheroidization rate of nodular cast iron?
Today I would like to tell you:  a practical solution for improving the spheroidization rate of ductile iron When the spheroidization rate is required to reach more than 90%,  the following measures can be adopted: one、 Select high-quality charge to reduce  anti-spheroidizing elements in the charge. Two、 Select a spheroidizer with low RE content to reduce  the effect of RE on the deterioration of the spherical graphite morphology. Three、The S content of the original molten iron should be less than 0.020%,  which can reduce the consumption of nodularizing...
High temperature operation! Foundry, these must be paid attention to!
High temperature operation! Foundry, these must be paid attention to!
The continuous high temperature in July  was also a work challenge for the workshop masters.  So in high temperature production,  we still have to pay attention to safety. 1. Heatstroke prevention and cooling:  We reasonably arrange working hours,  do not start production at high temperature  in front of the furnace in the morning,  stop production in the afternoon when the temperature is high,  arrange workers to rest in the dormitory,  and start production after the temperature drops in the evening. 2. Personal...
Our inoculant, the whole process of production!
Our inoculant, the whole process of production!
Hello everyone, I am the youngest girl in the factory. The inoculants of Nanjing Dysprosium Peak are:  0.2-0.7mm, 0.5-1mm, 1-3mm, 3-8mm with different particle sizes. At present, the workshop is producing silicon strontium inoculant.  The worker is adding raw materials with a good ratio to the medium frequency.  After melting to a certain temperature,  the molten iron will be poured into the round mold  specially containing the inoculant in the medium frequency furnace,  and cooled to form a After the solid, the inoculant is transported to  the...
Do you know what different inoculants do in casting?
Do you know what different inoculants do in casting?
Question: Do you know what role different inoculants play in casting? 3. Barium-containing ferrosilicon:  has a strong ability to promote graphitization,  can improve the shape and distribution of graphite in thin-walled castings,  and slow down inoculation and recession. 4. Zirconium-containing ferrosilicon:  Zirconium has a deoxidizing effect,  which is conducive to improving the fluidity of molten iron,  reducing the whitening tendency of cast iron,  and promoting uniform and fine A-type graphite. 5. Silicon-barium alloy: Using silicon-barium...
What are the inoculants?
What are the inoculants?
Q: Do you know what inoculants are? there are about 200 kinds of inoculants,  and more than 30 varieties of commonly used inoculants.  The categories of inoculants are as follows: 1. Classification according to ingredients:  silicon-based inoculants, carbon-based inoculants,  rare earth inoculants, etc.; 2. Classification according to the function of the inoculant:  stabilized inoculant, compound inoculant; 3. Classification according to the scope of use:  inoculant for gray cast iron, inoculant for ductile iron,  inoculant for vermicular graphite...
Do you know why spheroidization occurs
Do you know why spheroidization occurs
Hello everyone, I am the youngest girl in the factory. In the actual production process,  there are many factors that cause poor spheroidization,  which are summarized as follows: 1. Poor quality of nodulizer 2. Improper operation of spheiroidzing treatment before furnace 3. The original molten iron has high sulfur content  or the molten iron is oxidized 4. Improper placement of molten iron ladle  or slow tapping of molten iron 5. The spheroidizing agent is added too early  or the molten iron is not poured out of the pit of the dam 6. The temperature of...
How to solve the "interference elements" that affect production
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?
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
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
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?
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
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!
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
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
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
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...
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