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Home> News> How to Prevent Cracking During Gravity Casting ?
July 13, 2022

How to Prevent Cracking During Gravity Casting ?

The Gravity Casting Parts easy to thermal cracking and cold cracking. SCZY analysis for you.

1. Thermal cracking

It is generally formed at the end of solidification when the metal is at a high temperature near the solid phase line. Its shape is characterized by short cracks, wide gaps, zigzag shape, oxidation colour in the seam. The casting parts is unreasonable, the alloy shrinkage is large, the shape (core) of the sand concession is poor and the gravity casting process is unreasonable, etc. can trigger thermal cracking. Sulphur and phosphorus in steel and iron reduce the toughness of steel and iron, making the tendency to thermal cracking increase.

Reasonable adjustment of alloy composition, strict control of steel and iron in the sulphur, phosphorus content, reasonable design of the casting parts, the use of the principle of simultaneous solidification and improve the type (core) sand concession, are effective measures to prevent thermal cracking.

2. Cold cracking

Cold cracking is the sum of the thermal and shrinkage stresses generated when the casting is cooled to a low temperature in an elastic state, if greater than the strength of the alloy at that temperature, cold cracking is produced. Cold cracking is formed at a lower temperature, its cracks are small, continuous linear, clean, sometimes a slight oxidation colour. Wall thickness differences, the shape of complex castings, especially large and thin castings are easy to occur cold cracking.
Gravity Casting
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