1993 Nighthawk 750 frame and swingarm questions

I have searched the internet over (I'm usually pretty good at that), searched here, and a couple other bike forums and cannot for the life of me answer these questions.

1. What steel is the stock non race bike 1993 NH 750 frame made of? Best I can find is one person saying "mild steel." What does everyone use for hoops and gussets, etc? Seems like I'm the only one who doesn't know what to use. lol

2. Same question for the swing arm, same as frame? Different?

It's a UJM. Nothing even remotely exotic.
Mild steel tubing was the norm.

Thanks! Looks like Ill just be ordering that then.