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Old 02-08-2017, 02:23 AM
jimmontg jimmontg is offline
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Well apparently when alloyed and HT they were springy Damon. The platinum by itself is kind of springy, but springs is what the blueprint called them and they did have a heat treat, though I have no idea how that worked. Platinum's melting point is just about the same as titanium around 3200 degrees which is why I also think it may have been for the SR-71. What the alloy mix itself was precisely I have no idea. They look like silver more than anything. Remember, pure iron is soft and not springy and carbon isn't springy either.

Does lead alloy with steel? Yes. Try 12L14 a leaded sulfurized steel I warned my last company that made weak welds, but the machinists liked it. When machined it looks polished with no sanding, I mean it looks polished straight off the lathe. I had to make my welds 3x as big with it vs on 1020 cold roll. Try 1155 steel for an axe, apparently they make rail car wheels from it is what a friend told me when he worked at a company that made train cars. I have made and welded driveshafts for machinery with it. It tends to crack as most medium carbon steels do unless preheated, plus 1155 has a higher amount of sulfur in it to for ease of machining, hence it is considered a free machining steel. I never tried to make a tomahawk or axe from it, but it would be interesting to try. I wonder if the tiny bit of extra sulfur would make it brittle. I should have grabbed a piece of it from the scrap barrel.

I have seen some really odd alloys. One was an aluminum bronze titanium alloy that wore out bandsaw blades and I had to heat orange hot to bend. Took almost an hour to cut through a 1"x3" bar and an abrasive blade would clog up unless you kept putting cutting wax on it. The machinists used carbide cutters to machine it. Hated that job. Hated those springs too for that matter.
Next time I come up I'll bring one of the springs, they were already kind of springy before HT Damon. I'm guessing they were an electrical relay spring or similar.

I am familiar with HT steels of course, but also some aluminum and hardenable brass heat treats. HT isn't just about steels of course. I used to bend 6061 T0 (0 temper) aluminum that would be HT to T6 afterwards as T6 tends to crack badly when bent. Also in keeping with the subject of anodizing, aluminum when anodized gets harder from the anodize process. Not a lot, but it will jump up a few points of temper, it will also get harder when exposed to the sun and weather ages. Thickness matters too, the thinner sheet metal would get more brittle after anodize. We all have aluminum oxide sanding belts, also AO melts at around 3600 degrees where aluminum itself melts at around 1200. Oxide begins to form immediately after being exposed to air.

Alloy metals is a field onto itself, hence a Metallurgy engineering degree is offered in colleges. I mean who would have thought that adding nitrogen to steel would make it harder with less carbon like Sandvik' 14C28N has just 0.11 nitrogen in it or Z-FINit.

I apologize for going off on a tangent I was looking at AEB-L and all the cryo it needs is dry ice and it doesn't even have to soak at that temp, -109F is dry ice temp and it just needs -95F. Just some minor tweaking with the alloy and it doesn't need liquid nitrogen to achieve RC58-60. Or look at O1, just some minor additions of 0.50% chrome and tungsten, plus 0.20% of Vanadium with 0.90% carbon and you have a tool steel that is superior to the 10xx carbon steels. I just find it all fascinating. Like you found that CPM S30V. I still haven't seen a pic of it finished. Did you put a pic of it up on your Flickr account yet Damon?
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anodizing, battery, blade, buy, case, etch, etching, flashlights, glass case, handles, heat, heat treat, knife, knives, made, make, making, material, metal, pocket, polish, silver, steel, titanium, video


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