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Googlefu is letting me down, done a ton of research but can't find much. What material do framebuilders use for chainstay yokes? Something like 304 or 316 is easy to get but only has roughly half the tensile strength of Reynolds 853. The yoke is already a compromise in strength/stiffness so what do people use? Ta
Your first problem is comparing apples with oranges, 853 is an air hardening low alloy steel, 304 and 316 are stainless steels.
853 has more in common with the ultra high strength cold rolled steels use for car chassis.
https://www.tatasteeleurope.com/en/products/engineering/cold-rolled/ahss-uhss#properties_2
As long as you have weldability (or brazeability) I don't imagine the tensile strength of it will be that critical. It's a tiny part of the frame so worst case it weighs 3g more from being thicker walled.
Yeah I appreciate that they are quite different materials but I can weld them together and they will be fine, the drop outs etc are from 630 stainless from paragon anyway. I guess I should try and find a small piece of that because it's nice to weld and it's precipitation hardening. It's just not readily available to me.
Don't want 4130 as it's not so good at playing nicely with other alloys.
Strength is fairly important because it's the most flexy part of the cs.
Anyone have any scraps of 17-4 bar ?😀
tw metals will sell you T45, which would do the trick.
For a non-stainless brazed frame I'm just using 4mm mild steel with a lateral 2mm rib slotted through to add stiffness.
I'm very sceptical of all these builders insisting on using 4130 plate. The stiffness is the same whatever grade you use, and I'm not convinced anyone is going to yield or quickly fatigue something 5mm ish thick. I have plate dropouts zapped out of 6mm S355 - I bend over tabs to 45 deg to braze to and it takes a LOT of effort to bend.
Isn't T45 fairly high in Manganese? I though that made it right on the edge of what you should TIG?