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Tried a different pour temp on some 356 aluminum castings yesterday
We were running a bit hot, around 1450 degrees, and the parts kept getting porosity. Dropped it to 1380 on a hunch and the finish came out way smoother. Anyone else find a sweet spot for certain alloys that goes against the book spec?
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the_hayden4mo ago
Honestly, I always thought hotter was better to keep it flowing. Wasn't the book always saying that? Tbh, I fought with porosity on some 319 for weeks. Finally tried a lower temp like you and it just worked. Changed my whole view on it. Sometimes the book is just a starting point, you know?
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phoenix_lewis4mo ago
Remember the book is talking about pouring temp, not mold temp. Lower mold temp slows down how fast the metal freezes, which can actually help it flow better into thin spots.
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murphy.tessa4mo ago
Our old shop foreman swore by 1500 for 356, and I followed that for years. Seeing your results with 1380 makes a strong case for less heat in the mold. I guess the real data comes from the parts you pull out of the sand.
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