mysterious dense alloy

by alan-c
Tags: alloy, dense, metal, steel
alan-c is offline
Sep4-13, 04:01 PM
P: 4
I would like to identify a mysteriously dense metal I have in my possession. I bought a big box of engineering bits, along with a lathe, and found what I thought were High Speed Steel tool blanks which felt very heavy. I worked out the relative density and it is an amazing 16.97. The material is non-magnetic and grinds like silver steel (unhardened tool steel); I haven't tried machining with it. The closest element is Tantalum at 16.7 but it's not that because tantalum is soft.
The only marking on each piece is EDF 32851 and each piece is about 9 x 9 x 155mm.
Any ideas?
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phyzguy is offline
Sep4-13, 04:19 PM
P: 2,068
Could it be tungsten carbide (density 15.6)? It is often used for drill bits.
alan-c is offline
Sep4-13, 04:46 PM
P: 4
That was quick- and I never thought of TC. It's not though because it can be filed, although it is quite hard. It appears to be cast then ground to clean up, but not precision ground; this might help as a clue.

eigenperson is offline
Sep4-13, 06:39 PM
P: 131

mysterious dense alloy

It basically has to be a tungsten alloy -- any other metal that dense is either too expensive and/or poisonous. So unless someone made a set of platinum drill bits, in which case you are pretty lucky, it's probably one of these, or something like them.
alan-c is offline
Sep5-13, 07:50 AM
P: 4
Fantastic! I spent hours searching without finding that. This seems very likely. In the link you provided, their rd17 material is made for boring bars where it's stiffness and high mass reduce chatter -vibration which leaves poor surface finish- when machining deep holes on a lathe. It would explain why this material turned up in a box of assorted engineering bits.
One day I'll get around to trying it out; when I do I'll report back.
rollingstein is offline
Sep18-13, 03:35 AM
P: 305
Can't be depleted uranium can it? ;)
alan-c is offline
Sep18-13, 09:56 AM
P: 4
I'm not encased in a green glow so I'll stick with the tungsten alloy story.

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