Different type of lino.

[madsenshooter]

Here's some info I found digging around. Seems there was in the 1940s a type of lino used for repeat, long run jobs that had the following formula:

"Hard metal contains 14% tin, 24% antimony and 61% lead, and other ingredients in small percentages, which calls for a crucible temperature 100 degrees above regular Linotype metal's, 4 - 11 1/2 - 84 1/2 at 535 degrees."

Anyone wish to take guess as to what the BHN of this stuff might have been? It was labeled V-240 hard metal, and the Lino-Type company in the 40s and 50s offered to equip machines for the harder mix. I haven't been able to find any other references, though I have an old engineering metals handbook that I've not checked yet.

[R.M.]

35 BHN is my guess, air cooled.

[1911GrayWolf]

I have access to foundry type. Smelted a bunch into an ingot and had it scanned with an XRF gun, it showed close to those same numbers, 12%Tin/%20Antimony/%68Lead. It has a BHN of 31.

[imashooter2]

Looks like about 32...

http://home.comcast.net/~imashooter2/pictures/fig8-sm.JPG

[bumpo628]

Nice table.
I think the reading would be closer to 34 since 14 & 22 puts it right at the top-right corner of the table.

[madsenshooter]

Probably quickly approaching the next hardness curve, which we have to imagine. I have the same chart, imashooter2. Copied it out of an old American Rifleman when I was going to college in the 90s. I don't know why I didn't think to look at it, just had another bday, sometimes (often) things don't dawn on me the way they used to. Foundry type has a bit of Cu in it, could be this V-240 did too.

[JIMinPHX]

That's a great table. Thanks for posting it.