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Thread: Relitive Brinnell hardness

  1. 10-23-2017, 06:23 PM #1
    AggieEE
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    Relitive Brinnell hardness

    Mod if in the wrong place please move. I cast up some Lee 310 gr. bullets for my .44 mag using 50/50 ww/pb with copper added. I left some as cast and heated others to 425F, about, and water quenched. After 3 weeks aging, about 6 weeks on the air cooled I put a steel BB between the nose of an air cooled and the nose of a heat treated and mashed them together some. As near as I can measure the air cooled dimple is 0.083" and the quenched is 0.062. Now, since the same force was applied to both the PSI in each would relate as the square of dia or radius, conversion factors cancel out. If volume, the the cube of dia. So based on area the hardened bullet is about 1.8 times the BHN of the non hardened or 2.7 times based on volume. Which one? I'll look up the BHN of the copper alloy once I know what I'm dealing with. In my ME courses we never dealt with hardness directly. Thanks guys.
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  2. 10-23-2017, 07:27 PM #2
    Grmps
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    You could check the hardness with pencils
    http://castboolits.gunloads.com/show...s-with-pencils
    or get a hardness tester
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  3. 10-23-2017, 08:13 PM #3
    popper
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    As AC 50/50 is about 10 BHN, double that would be 20. Triple would be 30 and I don't think you are there unless a LOT of Cu was added. I WD Isocore(COWW) with 2% Cu and got high 30's. There is a dent dia. conversion chart here someplace, but I don't think it will work for you as one side of the BB is immovable.
    Whatever!
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  4. 10-23-2017, 08:33 PM #4
    runfiverun
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    about a 50-60% gain in BHN after water dropping is what I see, 11-12 bhn makes 18-19.
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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