How to Manufacture Quality Cast Steel
As we all know, the price of the steel cast is higher than the iron casting. But why?
If cast iron vs stainless steel, 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. However, the manufacturing of cast steel is more difficult than cast iron, thus its cost is higher.
Stainless steel casting belongs to investment casting or precision casting, with a relatively high melting point, and the molten steel is easily oxidized, due to poor fluidity of molten steel and large shrinkage rate. From a practical perspective, stainless steel casting is suitable for casting of various types and alloys.
I will show you how to produce quality cast steel as follows.
1. Poor liquidity of the molten steel.
Firstly, 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.
2. Simple structure requirement.
The structure of pouring system strives to be simple, and the sectional dimension is larger than that of cast iron.
3. The requirement of Suitable Casting Temperature.
We should adopt dry casting or hot casting, and the casting temperature should be at 1520-1600 ℃.
The fluidity can be improved since the casting temperature is high with a 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 the sand core.
3. Adopting hollow sand core and oil sand core to change the deformability and permeability of the sand mold and core.
Yide Casting is a leading casting foundry in China, with 27 years’ casting experience, provides casting & machining service for our casting customer. Here, we have a steel casting foundry partner, which we have cooperated for many years. Yide casting machines casting products, such as reel steel cast, cast steel plate, 6 inch steel caster wheels, burner stainless steel etc. If you are looking forward to a professional casting manufacturer, please don’t hesitate to contact us, and welcome to visit our JM casting factory in China.