Cutting a large shaft with a thermal lance - video

[Frank S]

I think they're just steel tubes. Maybe with some other stuff sprinkled in to make them more burn-y. The steel tube is mostly just a consumable delivery system for oxygen.

Some are just steel tubes but the ones that burn the hottest have rods or wires inside them of a metal that makes them burn at 10,000°
When I was doing heavy equipment repairs I had a Broco Prime cut torch with collets to clamp 1/4 & 3/8" rods A lot of times I would be called upon to lance the core out of a seized pin ranging form as small as an inch to as large as 10 or 12 inches in diameter I would lance a hole all the way through the length of the pin large enough to hollow out the core then quitch cool it with CO2 or liquid nitrogen a lot of times the pin could be slid out with a gentle push or light tapping with a 20 lb sledge for the largest of them
I don't know of anything they won't cut through
Ultrathermic Rods - Broco-Rankin