In the past when I have needed bits and pieces of cast tooling plate I've bought MIC6. I've made various tool and mounting fixtures with it. Recently I noticed one of my metal vendors has ATP5 for a fraction of what I've paid for MIC6 in the past. The specs look pretty similar.
Are there any significant differences I am missing?
Other than elongation (I am not sure what that means in this context) ATP5 seems like the better choice for most things. Weldable. Machinable. Castable. Stronger (slightly). Corrosion resistant. Cheaper.
MiC6 anodizes better.
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