If I had to guess, there probably is not one single type of steel that is used as the standard material. It would make sense to me that each steel coaster has it's own composition based on the requirements of the site and what kinds of forces the ride is going to produce. Again, this is just a theory here, but I would assume that the make up of steel for a hyper coaster built along a shoreline would differ from that of a kiddie coaster built in the desert.
*** Edited 11/10/2006 7:29:34 AM UTC by Fun***
Being the nerd that I am, I often wonder what yield and/or ultimate stress the steel that they use has.
That'd be carbon steel at 50 ksi yield strength for all you geeks who care :)
Actually, for the different applications, you're more likely to be looking at different paints than different steels. It's a lot cheaper to get a paint that's more resistant to sea salt or extreme heat than it is to try and get a custom-mix steel compound. Especially at hte prices that steel goes for these days.
I know Nickle and Carbon are two additives.
You can think of toughness as what happens when you hit it with a sledge hammer. Glass isn't tough so it shatters, steel should be tough and not shatter.
Welding process would more than likely be a low hydrogen method. Stick welding with a 6010 root pass electrode and 7018 electrode for the rest would be the best case. They might use a sub arc to protect the weld. Preheating and controlled interpass temperatures would likely be used.
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