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lakeside53
05-16-2010, 01:12 AM
I just cut the bottom off an old 7.25 inch diameter oxygen cylinder from a welder set. Seems like decent steel. Anyone know what type of steel it is?

knudsen
05-16-2010, 01:29 AM
You might get an idea by grinding and observing the spark color and behavior. I was looking for a better guide, but I guess I didn't bookmark it. This one is decent though: http://www.man.lodz.pl/LISTY/ODLEW-PL/2010/04/att-0000/02._20Metallurgy_20Made_20Simple-_20Metal_20Identification_20Ready_20.pdf

Optics Curmudgeon
05-16-2010, 01:47 AM
Back when I was in the industrial gas business (late 1970's) steel refillable gas cylinders were made of 4130 and went through a tempering process after forming.

Joe

boslab
05-16-2010, 04:19 AM
C .020 Mn 1.0 Si .2 P .03 S.03 Al [sol] .010 is favoured by Bausteel as thier grade B440hp, but to be honest i think the phos is way too high and would prefer 0.2 as a max so the brittle transformation dosent blow people up, the figures are maximum, I dont know what of the shelf grade to call it as it fits so many, take your pick, just dont reuse fo high pressure if refabbed, and please dont get a darwinian award taking the valve off, just because you think its empty....RIP
have fun
mark

Bguns
05-16-2010, 04:54 AM
Depends on age of tank....

If really old, it will be of simpler steel than modern shatterproof cylinders..

lakeside53
05-16-2010, 09:58 AM
Ths cylnder is from the late 60's. It's a rental tank that I got stuck with - the original company doesn't exist anymore, I don't have a bill of sale, I can't get it refilled, so it will be "repurposed".

The wife wants it as a "come back to the house for dinner" bell... but... I'm not sure I want to be that accessible.;)

I've never had much luck with the spark test methods, but that's just my lack of experience.

lazlo
05-16-2010, 10:12 AM
I just cut the bottom off an old 7.25 inch diameter oxygen cylinder from a welder set. Seems like decent steel. Anyone know what type of steel it is?

It's whatever passes the DoT tests :) Seriously, you can buy oxygen cylinders in a variety of aluminum alloys, fiberglass, and steel.

But the steel cylinders do seem like good quality chromoly -- the blacksmiths around here use them for forges and cut the bottoms off to make redneck wind chimes :)