Author Topic: Lead ????  (Read 750 times)

Offline Daryl Pelfrey

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Lead ????
« on: January 21, 2019, 01:55:56 AM »
 I can get lead blocks about 5 lb each. They are about2.5 in x 4x 6. Just guessing. They are cfrom the hospital where I work. How do i ck the hardness or find out what lead they are pure soft or whatever?

Offline snapper

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Re: Lead ????
« Reply #1 on: January 21, 2019, 02:50:43 AM »
what were they used for?

Would they be anything other than pure lead?

I picked up some lead pipes that were used for shielding some type of wiring.

I could tell by handling and looking at it that it look like pure lead.  It comes from an unknown source for me, as I bought it at the junk yard.  I bought 250 lbs, should of bought it all. 

You can use your thumb nail, but if you have never tried pure lead before then that is meaningless.

Fleener
My taste are simple:  I am easily satisfied with the best.  Winston Churchill

Offline Daryl Pelfrey

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Re: Lead ????
« Reply #2 on: January 21, 2019, 07:27:46 AM »
I can scrape a line in it with my thumb nail.  I dont think it has been used for anything yet. It has been at the hospital for many years. Could I make some balls with if and do some type of  hardness test?

Offline Daryl

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Re: Lead ????
« Reply #3 on: January 21, 2019, 08:12:09 AM »
Daryl - what mould sizes do you have?  Cast a ball and check the weight of the ball
 with what it should be in pure lead. We can help with that determination.
If there is any tin or antimony in it, they will be lighter than they should.
Being able to scratch a line is indicative of it likely being soft enough. Cast
a ball, weigh it & measure it and we will know for sure.
Daryl

"a gun without hammers is like a spaniel without ears" King George V

Offline Nhgrants

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Re: Lead ????
« Reply #4 on: January 21, 2019, 02:58:52 PM »
There is hardness test that can be done with drafting pencils.  I was doubtful but once I tried it,
I felt it was reliable as an indication of hardness.  I got a set of drafting pencils and tried them on
Flashing, 1:20, and wheel weight. Some folks have made a comparison between the pencil hardness
And brinell hardness. 
Softer pencils will cut soft lead while harder lead needs a harder pencil to cut it. There is a lot on the
Net about this test and which pencils to use.

Offline J Henry

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Re: Lead ????
« Reply #5 on: January 21, 2019, 03:10:17 PM »
  Get one of the ingots,pour some balls,and go shoot them, If they do all you want  go get some more ingots, pour some more balls and go shoot them. All the scratch,taste, sniff testing is of no use if what you are testing does not work for you. Pour some shoot some and see.

Offline JBJ

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Re: Lead ????
« Reply #6 on: January 21, 2019, 06:33:41 PM »
Hope that this helps.
J.B.



adventures of isabel by ogden nash

Offline OldMtnMan

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Re: Lead ????
« Reply #7 on: January 21, 2019, 08:42:31 PM »
What's an air cooled wheel weight?
Pete

Offline stubshaft

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Re: Lead ????
« Reply #8 on: January 21, 2019, 08:45:05 PM »
What's an air cooled wheel weight?

Wheelweight alloy that has been allowed to air cool after casting rather than dropping it into water bath to quench.
I'd rather die standing, than live on my knees...

Offline OldMtnMan

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Re: Lead ????
« Reply #9 on: January 21, 2019, 08:53:51 PM »
LOL..I was thinking of what it meant on the wheel.

Thanks.
Pete

Offline Daryl

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Re: Lead ????
« Reply #10 on: January 21, 2019, 11:23:18 PM »
For those interested.
The brinel hardness of quenched lead, bullets or balls will depend on the temperature the lead is as it hits the water. Temperature used in casting has
a great deal to do with this.
WW alloys, the old stuff around 10 to 13 brinel, due to the 2 or 3% arsnic in it, will heat treat as the chart notes to considerably harder alloy.  Balls or bullets cast from lead shot will do the
same, due to the arsnic in their composition. IIRC 1% is about all that is needed.
Pure lead and tin alloys, nor straight PB(lead) and antimony mixes will water harden.
We also put cast bullets of (the old) WW in the oven (when wife is not at home) and cook them for 1 hour at a temperature that is just below slumping, then remove and dump them into a bucket of
water, with a folded towel at the bottom. The balls or bullets will still be soft, so at this time, immediately lubricate them.  Over the course of 11 to 12 hours they will harden as they sit at room temperature, to upwards of 30 to 34 brinel.  If they are sized and lubed after they are hard, the surfaces "worked" will soften- thus, sizing and lubing immediately after quenching is necessary.
Cast bullets or balls hardened this way, can be made harder than any other method of mixture of lead, tin or antimony.  Dead soft copper has a brinel of 34/35.
I have been 'doing this' hardening and shooting hardened cast bullets since about 1978.
Daryl

"a gun without hammers is like a spaniel without ears" King George V

Offline Jerry

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Re: Lead ????
« Reply #11 on: January 22, 2019, 07:59:27 AM »
Lee Hardness Tester.

rfd

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Re: Lead ????
« Reply #12 on: January 22, 2019, 03:25:06 PM »
my lead testing is cast, weigh, shoot, see.  with properly lube patched balls, the bore is protected.  the rest is up to consistently cast balls with no voids and their consistent accuracy.  where hunting is concerned, it's a matter of expansion versus penetration, and this is where ball hardness and weight might matter.  choose aptly for the type of game hunted.

Offline hudson

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Re: Lead ????
« Reply #13 on: January 22, 2019, 05:16:45 PM »
I generally use lead pipe less the soldered joints. Was given some lead from the telephone company. This stuff passed the thumb nail test, in use it loaded hard. I placed it against a Hornady ball in the vice, it imbedded in the Hornady ball without deforming.

Offline Scota4570

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Re: Lead ????
« Reply #14 on: January 22, 2019, 09:46:48 PM »
I can get lead blocks about 5 lb each. They are about2.5 in x 4x 6. Just guessing. They are cfrom the hospital where I work. How do i ck the hardness or find out what lead they are pure soft or whatever?

Sounds like radiation shielding.  That is premium stuff, get all you can. 

Offline smylee grouch

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Re: Lead ????
« Reply #15 on: January 23, 2019, 03:45:05 AM »
I agree with Scota, several years ago I got about 800# of the stuff from a hospital remodeling sight. I had to clean it up, there was a layer of oily paper on it but it produced some of the best round balls I have ever cast.

Offline Black Jaque Janaviac

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Re: Lead ????
« Reply #16 on: January 23, 2019, 04:22:10 AM »
Scota has the idea.  I compare lead that I am considering buying to a known source.  You can take a lead ball that you know is soft enough and squish it against a ball unknown hardness.  The softer lead will give way to the harder lead.  You need to compare pieces of equal structure as I believe a .530 ball might squish a .310 ball even if the bigger one is softer.

Once you get the hang of it you can squish just one ball in a channel lock pliers and you'll get an idea how much you can squish pure lead.  If I cast from sewer lead I can sqish a .530 ball to look like chewn bubble gum.  If I cast from wheel weights I can sink the teeth of the pliers, but it will remain round.

Offline D. Taylor Sapergia

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Re: Lead ????
« Reply #17 on: January 23, 2019, 08:54:23 AM »
Hospitals sometimes have lead 'boxes' in which they store and ship radio isotopes.  They are pure lead.
D. Taylor Sapergia
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Art is not an object.  It is the excitement inspired by the object.

Offline Phil Neal

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Re: Lead ????
« Reply #18 on: January 30, 2019, 07:13:40 AM »
Just drop it on a hard surface, soft lead will have a dull thud.  If it has a alloy it will ring with a metallic sound, plus the fingernail test is a good way to go.