On Sunday, 23 November 2014 06:29:52 UTC+5:30, wrote:
On Saturday, November 22, 2014 11:42:46 AM UTC-5, Ed Huntress wrote:


"Chrome-moly" usually means AISI 4340 steel or equivalent. 240 kpsi is
about the maximum, and elongation falls off sharply above 200 kpsi. At
225, it's down around 5/%.

Is that enough for your bar? I don't know. Maybe the real-world
application is no problem. At 5%, as a general matter in structural
applications, you begin to expect sudden failures. But maybe it's OK
for such a bar.

--
Ed Huntress

I would think that 4130 would be a better choice than 4340.

Dan

Dan,

4130 doesn't meet my strength requirements. Remember, I need the bar to resist permanent deformation. That can be achieved only by high yield strength.. The standard is 200000 psi Tensile strength with ~ 180000 psi yield strength. Even then bars bend with abuse.