Send me a email at snipped-for-privacy@yahoo.com if you have any interest. Have several diameters and am willing to sell in small amounts and mixed sizes at what I think are reasonable prices. I am near Philadelphia for figuring out shipping.
312 stainless is good for welding most any stainless to mild steel or any stainless to stainless. It can be used for welding 4130 steel tubing, but Lincoln does not recommend it as it is usually much more expensive.Dan