Posted by BarnyardEngineering on October 24, 2019 at 10:05:06 from (98.17.202.245):
In Reply to: Terrified to ask posted by Grandpa love on October 23, 2019 at 13:37:28:
Whatever steel they use on drawbars, it's a "tough" steel, not a "hard" steel. Hard steels snap randomly under a shock load. Tough steels have resiliency; they will flex and return to shape.
The way I understand it, and it's been a while since college, alloys with nickel content are tougher alloys.
In this case it is not that critical. Just don't use make it from known hard steel, like a cutting edge, and don't "heat treat" it by getting it to critical temperature and quenching.
The nice thing about a mild steel is that it will bend-bend-bend long before it breaks, so you will have ample warning if the drawbar is inadequate.
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