[sharps4590]

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

 

[unclenick]

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

 

[sharps4590]

nick, do you by chance have a chart on what alloy is what BHN or can you direct me to one? I don't believe I have any such animal.

 

[johnjay]

Alloy hardness in BHN

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.

 

[unclenick]

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:

[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]

 

[twodot]

I find the "Alloy Calculator" here to be helpful
http://www.castbulletassoc.org/downloads.shtml
..

 

[johnjay]

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:

[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

 

[unclenick]

Yeah, no way to get there. I just left it there to illustrate the step sizes. It makes you realize an exact measurement is pretty tough to arrive at.