In the mid 80’s I went with Uni to a centrifugal casting factory in Sheffield.
One of the jobs they did was make a cylindrical casting of about 6” wall thickness. It then went off to RR(?) for final machining into an exhaust pipe for a Tornado jet.
They a fully machined one that ad been rejected because of a crack. You could pick up easily with one Handand had lots of holes along its length for attaching components.
Their Operations Manager used to buy them at scrap value for use as planters in his garden.
I wish I could have bought one.