You would need to know the exact chemical properties of the steel. I could see them being made from something like chrome-moly or a 4140 but even then there are differences in the processes (annealed, pickled and oiled etc…) and chemical makeup. A little bit of carbon added and the processes used, make a huge difference in these steels.
Pretty sure they are made from carbon steel as most are chrome plated, so not 316, 304 etc…, which are stainless steels.[/quote]
Bars are made from the cheapest shit they can get away with. I’d say they’re mainly 1018, 1020 and maybe 1045 mild steel. The higher alloys like 4140, 4142, 4340 (heat treatable) would be for the higher end bars, if someone wanted to shell out the $$ for it. If I was making bars for myself, I’d use 4140 steel. Watch out going higher in the chrome molly alloys, they are more prone to fatigue-breakage than mild steels.
For strictly hollow bars, they’re probably all mild steel, especially if they have to machine them for the stops or put grip knurls on them. I would look at some of the manufacturer’s of weight sets and see if they advertise what their stuff is made from. If it wasn’t published, email them and ask, they’ll probably tell you.
Any steel property can be found in any dynamics, physics or engineering materials handbook. If you have access to Machinery’s Handbook, it’ll be in there as well.
Yeah, I was referring to quality bars. The cheap ones are probably made from a mild steel like you said.
There is a wide range of Chrome-moly ranging from very cheap to very expensive. Steel bike frames are made almost exclusively from it, from your $100 Huffy up to $1500+ KHS. Few things see cold working more than a mountain bike frame, except maybe an oly bar.
As far as finding the dynamics, he will have to understand what they mean as well. Matweb is another excellent resource.
I was thinking that chrome-moly tubing may work out for a hollow bar and be a lot less expensive than a solid bar. I’m familiar with matweb from work, a truly great reference for material selection. I have other fav sites from Uddeholm, Carpenter and still have a few textbooks I crack open now and then.