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Originally Posted by JamesCH95
@Tristan: why did you (your team) go from 1018 steel to the somewhat weaker 12L14 steel? EDIT: I guess it depends on the grade of each steel, one could be stronger than the other, depending on heat-treatment and cold working.
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I originally recalled that it was AISI 1018, but thinking about it some more, it might have been AISI 1045 (turned, ground & polished stock). It was a while ago, so I'm not sure what we actually used.
The AISI 12L14 was used because we had it available, and didn't have too much time to make the replacement shafts (it's a free-machining leaded steel). It was even more ductile, and twisted before failing.
A good alloy steel or titanium alloy would probably work for this application too. Those may well have sufficient strength, without having to deal with hardening—but at a somewhat higher raw material cost. (But hardening O1 or an alloy/tool steel will give even greater strength, if needed.)