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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.