Linotype, alloy mix

5057 Views 7 Replies 4 Participants Last post by unclenick, Feb 4, 2011

sharps4590

Discussion Starter · Jan 4, 2011

I'm going to be really lazy here. I have an alloy in one of several books but instead of looking it up I'm going to ask.

I have acquired 88 lbs. of linotype from my oldest son. I seem to remember one mixed it 50/50 with straight lead but don't recall the BHN # or if that is the correct percentages. Any help appreciated.

Thanks!

Vic

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johnjay

· #4 · Feb 2, 2011

Alloy hardness in BHN

unclenick said:
That turns it into the same mix as Teracorp magnum alloy, IIRC. BHN around 16.

I have data to simplify the measrement of bullet alloys. This was developed by the NRA and quoted by Harrison. The comparison was calculated from impressions in pure lead (BHN 5) and an unknown alloy,made with a steel ball. The method is simple and accurate. Too bad such info has become lost or been forgotten.

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johnjay

· #7 · Feb 3, 2011

unclenick said:
Sharps4590,

I missed your post. The LASC site has some of the data you want if you scroll down far enough, here. There is also a short list in the Lyman reloading manual.

Johnjay,

The whole Brinell hardness scale is based on the diameter of the impressions of a steel ball that results from putting a known load on it. You can substitute the Lee hardness tester's indentations, dividing the diameter of its indentation in pure lead by the diameter of the indentation you get in your sample. Get the sample BHN by looking up the ration on the right, below:

Code:

[FONT=Courier New]BHN Ratio 4.2 1.0000 Pure lead 5 0.9225 6 0.8470 7 0.7385 9 0.6979 10 0.6633 11 0.6335 12 0.6072 13 0.5840 14 0.5632 15 0.5445 16 0.5277 17 0.5122 18 0.4980 19 0.4850 20 0.4729 21 0.4617 22 0.4512 23 0.4413 24 0.4323 25 0.4236 26 0.4155 27 0.4079 28 0.4005 29 0.3937 30 0.3871 31 0.3809 32 0.3750 33 0.3694 34 0.3639 35 0.3588[/FONT]

Neat, I might argue about the third decimal place tho

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