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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Before I buy Leaded Steel
I kinda asked this question once before, and got a bunch of answers that
all seemed off the point. So I'm going to try again, and (hopefully) make my question specific enough this time. Everybody tells me "use 12L14, it's really easy to machine". I'm willing to accept that -- I'm using steel that I get surplus, and there's a wide range of machinabilities that I'm experiencing; I can certainly see how using the _right_ steel might make a significant difference. But: If I take some annealed or normalized 1065 steel (or other 10"something big" steel), get it to the shape I want, and properly heat treat it, it's going to be a _lot_ harder than when I started. So assuming that I can machine it in the first place, then get it to hold its shape (or correct its shape after the fact) and not crack in the heat treat process, I'm way ahead. On the other hand, if I take 12L14, get it to the shape I want, and do the _very best heat treat in the world_, then -- because of the low carbon content -- it's not going to be much harder. Right? What about 1144 or 41L40? Do you get much by heat treating these? How easy are they to machine compared to 12L14? Why isn't there a 12L50? I've heard tell that 1144 isn't as strong as other steels of similar carbon content -- true? What about the mechanical properties of 41L40 after heat treat? I'm basically looking for a steel that'll be suitable for model airplane crank shafts. The advice that I get from the hobby builders of model airplane engines is "use 12L14 and don't crash". I'm not going to discount this -- but it'd be nice to be able to do something on par with what I buy at the store. So, basically, something that's easy to machine, but that'll harden up to something between a grade 5 bolt and a grade 8 bolt. -- www.wescottdesign.com |
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