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Thread: Lead alloy with Si content

  1. #1
    Boolit Buddy
    Join Date
    Nov 2012
    Location
    Norway
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    493

    Lead alloy with Si content

    Hey all.

    I got some ingots from a friend of mine. He said that it took long for them to cool when he made them. It was originally a weight with some paint or something similar on the outside, he told me.

    With this in mind I got them tested at the scrap yard and the XRF gun showed a content of 6sn16sb and some of them 5.5%Si.

    Have any of you used ingots with Si for casting? Do you thing this is some contamination from the layer outside of the original lead? And the last and most important question, does it matter? Because of its high antimony content it would be great to alloy up soft alloy.

    Thanks

    Sent fra min YAL-L21 via Tapatalk

  2. #2
    Boolit Buddy
    Join Date
    Feb 2021
    Posts
    217
    Should be alright. Test a piece with your hardness tester. That will give you an idea how much to blend with pure lead,
    then pour a few to see if the mold fills out.

  3. #3
    Boolit Buddy
    Join Date
    Oct 2010
    Location
    South Prairie, WA 98385
    Posts
    306
    Greetings,

    Had a similar problem with Silicon values in the Ingot test.

    Second time through, I used a coarse file and removed the surface metal of the ingot.

    Now, the Silicon value is gone.

    My metal was Range Scrap and possibly had sand in the metal.

    Silicon being lighter than Lead, I suspect it migrates to the outer surfaces.

    Cheers,

    Dave

  4. #4
    Boolit Buddy
    Join Date
    Nov 2012
    Location
    Norway
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    493
    Thank you all! I will try and cast with them and se how it goes.

    Sent fra min YAL-L21 via Tapatalk

  5. #5
    Boolit Grand Master Good Cheer's Avatar
    Join Date
    Jul 2010
    Location
    the Ark
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    5,273
    Hey there.
    Can't prove it but I suspected at the time that this chemical plant piping was perhaps high in silicon.
    It cooled slowly and developed some interesting grain structure. You can see it in the expanded hollow point.
    It filled out the mold and shot great.




  6. #6
    Boolit Master


    Soundguy's Avatar
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    Oct 2016
    Location
    N Central Florida
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    2,833
    that is interesting grain structure. reminds me of bismuth.. however.. that would have showed up on the xrf

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check