COMMON GRAY IRON PARTS STRESS RELIEF ANNEALING SPECIFICATION COMPARISON TABLE

In order to eliminate the residual stress of the casting, stabilize its geometric size, reduce or eliminate the distortion produced after cutting, it is necessary to perform stress relief annealing on the casting.The determination of stress relief annealing temperature must consider the chemical composition of cast iron.

https://www.dffoundry.com/comm....on-gray-iron-parts-s

HOW TO IMPROVE THE SPHEROIDIZATION RATE OF DUCTILE IRON

The spheroidization level of domestic ordinary spheroidal graphite cast iron castings is required to reach level 4 or above, (that is, the spheroidization rate is 70%), the spheroidization rate achieved by the general foundry is about 85%. In recent years, with the development of nodular cast iron production, especially in industries with high requirements for wind power casting .

https://www.dffoundry.com/how-....to-improve-the-spher

HOW MANY TYPES OF CASTING ELECTRIC FURNACES ARE THERE?

Electric furnace is a heating furnace that converts the electric energy in the furnace into heat to heat the workpiece. Compared with fuel furnaces, the advantages of electric furnaces are: the atmosphere in the furnace is easy to control, and can even be vacuumed; the material is heated quickly, the heating temperature is high, and the temperature is easy to control .


https://www.dffoundry.com/how-....many-types-of-castin

HERE COMES A COMPREHENSIVE ANALYSIS OF GLOBAL CASTINGS

Castings are metal moldings obtained by various casting methods, that is, the smelted liquid metal is poured into a pre-prepared mold by pouring, injection, suction or other casting methods, and after cooling, it is polished and other subsequent processing methods. The resulting object has a certain shape, size and performance.

https://www.dffoundry.com/here....-comes-a-comprehensi

THE CASTINGS HAVE LARGE GRAINS, AND I WILL GIVE YOU SOME PRACTICAL SUGGESTIONS!
If the cross-section difference of the casting is too large, the thicker cross-section will cool slowly and cause the coarse grains there. Metals, such as gray cast iron, which are very sensitive to cross-sectional changes, are more likely to produce such defects. An effective way to prevent such defects is to avoid excessive disparity in the cross-sectional dimensions of castings, but this approach is sometimes beyond the reach of foundry workers.
https://www.dffoundry.com/the-....castings-have-large-