Fixing alloy question

[catkiller45]

Just got some pure lead.
What bhn do you think I
would have if I mixed 5 lb

of lead and 1 lb of wheel weights.

[Rickf1985]

Here is the cast boolit alloy calculator. Go to the last edit (2/28/20) and download the attachment and install it on your computer.


https://castboolits.gunloads.com/showthread.php?105952-Lead-alloy-calculators/page14

Using that calculator I found your number, 9.1 in about 6 seconds.

296391

[fredj338]

Here is the cast boolit alloy calculator. Go to the last edit (2/28/20) and download the attachment and install it on your computer.


https://castboolits.gunloads.com/showthread.php?105952-Lead-alloy-calculators/page14

Using that calculator I found your number, 9.1 in about 6 seconds.

296391

I dont think it will be that high. CLip ww are about 11-12 & you are cutting it 5-1 with pure, about 6. I think 1-1 would be closer to 9bhn.

[bangerjim]

I would guesstimate 6.5 or so. No higher. The calc has some known problems with high concentrations of pure Pb. But it is valuable tool for any and all casters! Everybody should download it and use it. I do.

[Stewbaby]

The calculator uses the formula posted by Rotometals, so as you can see it has the ‘issue’ mentioned above of starting any ‘mix’ at 8.6 (lead with about 1% Sb already)…above the 6 of pure lead.

https://uploads.tapatalk-cdn.com/20220225/f763cc0fe2b51797da545d3e04ab4402.jpg

[SoonerEd]

Weighted average formula. Assuming Pb @ 6 and WW @ 12.5:

5/6*6BHN + 1/6*12.5BHN = 8.1 BHN

The very pure lead I have is in the 5.0-5.5 range BHN. The WW I have appear to be older with higher Sb than newer ones. So, my WW lead is usually in the 12.5-13.0 range. Yours may differ slightly.

I use this when I know the hardness but not the composition of the alloys. After two weeks the blended lead tests close to this formula.