Posted by Mark - IN. on June 26, 2017 at 18:38:05 from (24.15.155.76):
In Reply to: Nitrogen posted by Dan Richardson on June 26, 2017 at 04:41:49:
Back in the '70's when I used to run an 1,800 ton aluminum extrusion press, we used to inject nitrogen into some of the dies as the aluminum billets were being forced through them to remove or block oxygen, an impurity that would sometimes cause the aluminum to bubble at extreme temperatures. I forget how hot we used to heat the billets to extrude them, but I remember that they were so hot that they were white in color. Mighty hot. Funny thing is that it would sometimes get to about 130 or so degrees around the press but the nitrogen tanks would have thick buildups of frost and we'd make snowballs and throw them around in 130 degree temperatures. Someone would be doing their thing...POW...a snowball in the back of their head to help cool them of, of course.
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