Advantages and Disadvantages of Stainless Steel Casting Process

Advantages and disadvantages of stainless steel casting process

 

Everyone in the casting industry knows a fact. That is the mechanical properties of stainless steel casting are higher than that of cast iron, but its casting performance is worse than that of cast iron. Stainless steel casting belongs to investment or precision casting, with relatively high melting point. The molten steel is easily oxidized, due to poor fluidity and large shrinkage rate. From a practical perspective, stainless steel casting is suitable for casting of various types and alloys.

 

Advantages and disadvantages of the stainless steel casting process are as below:

 

First, due to the poor liquidity of the molten steel, the wall thickness of the steel castings should not be less than 8 mm, in order to prevent the cold shut and misrun. The structure of the pouring system strives to be simple, and the sectional dimension is larger than that of cast iron. Adopt dry casting or hot casting, and the casting temperature should be appropriately increased to 1520-1600 ℃. The fluidity can be improved since the casting temperature is high with large superheat, thus the liquid stays for a long time.

 

However, if the pouring temperature is too high, it will cause defects such as coarse grains, hot cracks, pores and sand burning. Therefore, the casting temperature of small, thin-walled and complex casting should be at the melting point +150 ℃; and of large, thick-walled casting +100 ℃.

 

We must take these measures to prevent the occurrence of shrinkage holes and cracks in stainless steel castings. 1. Making the wall thickness uniform, and avoid sharp and right angle structures, 2. Adding sawdust to sand mold, and coke to sand core. 3. Adopting hollow sand core and oil sand core to change the deformability and permeability of the sand mold and core.

bronze casting & brass casting pipe

The Smelting Process of Copper Alloy

Metallurgical Microscope for grey iron casting and ductile iron casting

The Density of Ductile Iron

The density of ductile cast iron is approximately 7.3 g/cm3, or 7.3 kg/liter, or 119.6 g/cm3. However, due to the material grade and shrinkage level, the density has a certain range of variation.

In other words, if the quality of pig iron used by the iron foundry is better and the shrinkage rate is smaller, then the density of ductile iron will be higher. Otherwise, the density of ductile iron will be lower. Therefore, it ranges from 7.1 to 7.3 g/cm3.

Iron foundries usually estimate the weight of rough castings by calculating the volume of ductile iron, so the density will be used. However, you cannot judge the quality of castings by density alone.

There are more factors that will affect it, such as spheroidization rate and cooling rate. Hence, it will be reasonable within this range.

2025 Made in China and ONE BELT, ONE ROAD Policy Impact on Iron Foundry

With the implementation of “Made in China 2025” and “One Belt One Road” construction, the rapid development of all walks of life will be promoted. At the same time, the scale of China’s metal casting enterprises is also increasing year by year.

 

With the rapid development of various application fields, industry concentration has gradually increased, and product quality has continued to improve. This shows that the foundry industry has entered a medium-to-high-speed development stage.

 

The China (Beijing) International Foundry Exhibition will continue to be held at the China International Exhibition Center (new hall). In this way, it promotes the innovation and development of the foundry industry and promotes in-depth cooperation and exchanges between enterprises.

 

As a foundry with a history of more than 20 years, Yide Casting will take this opportunity to meet the needs of different customers in countries along the “Belt and Road” with high quality, high technology and high quality. Use better cast iron products to show the world the capabilities of China’s manufacturing.

cast iron bracket

Ductile Cast Iron EN-GJS-400-15/GGG40

Ductile Cast Iron EN-GJS-400-15/GGG40

 

EN-GJS-400-15 ductile iron is a very common material in European standard DIN EN 1563.

It is equal to GGG40 in DIN 1693, QT400-15 in China, A536 60-40-18 in USA ASTM, GS400-12 in Italy, FCD400 in Japan, FGS400-12 in France, FNG42-12 in Belgium, SJK-400 in Norway and ISO 1083 400-15.

Now, let me introduce its mechanical properties, chemical composition, foundries and castings to you.

Properties of EN-GJS-400-15/GGG40 cast iron

Tensile strength ≥ 400 Mpa.
Yield strength ≥ 250 Mpa.
Elongation ≥ 15%.
No impact requirement.

Hardness of EN-GJS-400-15/GGG40 cast iron

The hardness of this ductile cast iron grade is between 130-180 Brinell hardness.

Density of EN-GJS-400-15/GGG40 cast iron

The density of this ductile iron grade is about 7.3 g/cubic centimeter, or 7.3 kg/liter.

Chemistry composition of EN-GJS-400-15/GGG40 cast iron

According to the standard DIN EN 1563 and DIN 1693, the foundries could adjust the chemical composition as long as the mechanical and physical properties of the castings could meet the requirements in Standards.

The following chart is an approximate chemical composition range for your reference.

DIN EN 1563ISOC %Si %Mn %P %S %
EN-GJS-400-15400-152.5-3.80.5-2.50.2-0.5≤0.08≤0.02

Foundry of EN-GJS-400-15/GGG40 cast iron

These ductile iron castings were produced by Yide Casting in China.

machinery part

Cast Iron Wheel Hub Shell

Engine Base Ductile Iron

Engine Base Ductile Iron

Auto Part Cast Iron Bracket

Auto Part Cast Iron Bracket

car part

Ductile Iron Auto Parts

cast iron car flange

Ductile Iron Casting Auto Flange

Truck casting

Cast Iron Fire Truck Parts Casting

iron casting bracket

EN-GJS-500-7 Ductile Cast Iron GGG50

EN-GJS-500-7 Ductile Cast Iron GGG50

EN-GJS-500-7 is the middle grade of ductile cast iron in European standard DIN EN 1563.

It is equal to GGG50 in DIN 1693, QT500-7 in China, A536 70-50-05 in USA ASTM, GS500-7 in Italy, FCD500 in Japan, FGS500-7 in France, G500/7 in India, FGE50-7 in Belgium, SJK-500 in Norway, and ISO 500-7.

Now, let me introduce its mechanical properties, chemical composition, foundries and castings to you.

Mechanical Properties of EN-GJS-500-7

Tensile strength ≥ 500 Mpa.
Yield strength ≥ 320 Mpa.
Elongation ≥ 7%.
Hardness range: Brinell Hardness 170-230.
No impact requirement.

The tensile strength and elongation are the key inspection standard for qualification. Iron casting buyers could judge unqualified castings according to these two parameters. Hardness can not be taken as quality evaluation data unless you have special requirements.

Chemical Composition of EN-GJS-500-7

The normal chemical composition for this grade is as the following:

C: 2.7-3.7.
Si: 0.8-2.9
Mn: 0.3-0.7
P: ≤0.1
S: ≤0.02

The chemical composition has a big difference in different standards. All compositions are just for reference. The international standards stipulate that the manufacturers could adjust their chemical composition according to their experience and production conditions, as long as their material could meet the mechanical properties.

Production Foundries of EN-GJS-500-7

EN-GJS-500-7, or called cast iron GGG50, is a very common and normal cast iron grade. Most the iron foundries in China could produce this material. So, it is not difficult to find a foundry who could produce it, but just difficult to find one who could produce it very well. In other words, consistent quality is always important.

Main Casting Products of EN-GJS-500-7

There are many ductile casting products using this grade, such as iron brackets for trucks, tractors, other agricultural and construction machinery. The followings are some casting products manufactured by Yide Casting foundry.

hand pallet truck bracketcasting iron bracket cast iron bracket cast iron bracket

 

Yide Casting Welcome the Visiting of Foreign Customers!

With the rapid development of the company and the continuous innovation of R&D technology, Yide Casting is also expanding the international market and attracting many foreign customers to visit and inspect.

With the further expansion of the business, our ductile cast iron products originally exported to the United States have been highly recognized by the local market. Yesterday, American customers visited our company and our company expressed a warm welcome!

Chairman Wang of our company negotiated business with customers. We had detailed exchanges on the company’s strength, development planning, product sales and typical cooperative customers.

 

Introducing the company’s history, workshops and products to customers.

Taking customers to visit and inspect our two fully automatic casting lines.

During the visit, the foreign trade supervisor communicated with customers on the processing technology and processing efficiency of cast iron products.

After the visit, customers have more recognition of the product quality. Yide Casting sincerely invite more domestic and foreign friends to visit our

company for further cooperation!