Porosity (sand holes) inside steel can result from various factors during the manufacturing and processing stages. How to avoid the sand holes in the steel and how to ensure our quality for you?Let’s us talk

 

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Causes:

Casting Process:

• Gas Entrapment: Improper degassing of the molten steel can lead to gas bubbles being trapped inside the cast.

 

• Poor Pouring Technique: Incorrect pouring temperature or speed can cause turbulence, leading to gas entrapment.

 

• Mold Design: Inadequate mold design can lead to insufficient feeding and gas entrapment.

 

Material Impurities:

• Non-Metallic Inclusions: Presence of non-metallic inclusions like slag can create weak points, leading to porosity.

 

Solidification Process:

• Shrinkage: Improper control of the cooling rate can lead to shrinkage cavities, which appear as porosity.

 

Solutions:

Improved Casting Techniques:

• • Vacuum Degassing: Use vacuum degassing to remove dissolved gases from the molten steel.
• • Controlled Pouring: Optimize pouring temperature and speed to reduce turbulence and gas entrapment.
• • Enhanced Mold Design: Design molds with proper venting and feeding systems to minimize gas entrapment and shrinkage cavities.

Material Quality Control:

 

• High-Purity Materials: Use raw materials with low levels of impurities.

 

• Thorough Inspection: Perform thorough chemical analysis and non-destructive testing (e.g., ultrasonic testing) to detect and eliminate internal defects.

Solidification Control:

• Controlled Cooling: Implement controlled cooling processes to avoid rapid solidification and shrinkage cavities.