Cu in alloy from antimony alloy?

[Canuck Bob]

I have the opportunity to pick up some antimony 1 lb. bars. The alloy is antimony with 5-7% lead and 3% copper. Before checking further what is the ramifications of using the copper? I'm talking 10lbs. in about 400 lbs. of alloy.

Serious typo: These are tin alloy 1# bars with 5-7% antimony and 3% copper. Corrected above.

 

[RBHarter]

A bullet that handles pressure better and is better suited to high speed impact .

Based on my very limited unscientific use of such by accident at first .

 

[Rick]

High pressure high velocity but seems to me that 3% Cu is right about a whole ton. Popper on the forum here has dealt with Cu alloy a bunch, he will probably chime in here.

 

[Canuck Bob]

Edit; to clarify, good catch Rick, that is 10#s of these TIN (see first post edit) bars in 400 lbs. Or .3#s of Cu in +400 lbs (guessing 450 actually, added 80#s of mixed wheel weights).

I've accumulated scraps so I can alloy a staged 400# run then sell off the ingot tooling, cut down propane tank and turkey fryer etc..

 

[Brad]

Tin bars with 3% Cu is just fine. Adding 1% Sn will add only .03% Cu. You would need 5% Sn to even start to notice the Cu much.

I would grab all of that alloy I could. I would treat it as essentially pure tin and move on.

 

[Canuck Bob]

Thanks, I've been reading about alloys and sorry for the tin confusion. I'm confirming the availability now and if available will buy some if price isn't stupid. I mean stupid for me, a guy can offer whatever he feels is fair!

15#s bought at about $120 CAD delivered. Will do zinc test when bars arrive.

 

[Brad]

Anything under $10/# is good.

 

[Canuck Bob]

Worked out to be a firm $100 for 15#s delivered or a little under $7/#. This ends my acquiring and moves me to making ingots this fall. A thread for a different time.

 

[fiver]

that's really a good price.
if tin is following lead prices then it really jumped up recently.
I thought for a while there that something was artificially holding lead prices up, but it went insane this last week and jumped up about 14 cents a pound and isn't showing any signs of coming back down anytime.

 

[Ian]

Are the Hunt Bro's back at it again?

 

[fiver]

no this is something else.
there is generally a bump this time of year and another one in spring.

it's like there have been the normal orders but someone has been buying enough lead to bump the price up over a period of weeks [the price kept coming back down a bit] and then bam there have been 2-3 big jumps.