On Sun, 06 Apr 2008 23:51:58 GMT, Dan@ (Dan ) wrote:

Does this mean there is no such thing as seamless pipe?

No, there IS such a thing as seamless pipe, but it ain't cheap - and
structural tubing is more likely to be DOM

Seamless (SMLS) Steel Pipe is made from a solid round steel €˜billet
which is heated and pushed or pulled over a form until the steel is
shaped into a hollow tube. The seamless pipe is then finished to
dimensional and wall thickness specifications in sizes from 1/8 inch
to 26 inch OD.

a seamless PIPE is manufactured, for example, from a billet of steel
about 10 inches in diameter and 6 to 8 feet long. After heating to
over 1000 degrees C., a hole is pierced through the center to form a
very thick-walled tube. Hot rolling and cold drawing then
progressively reduces the wall thickness and diameter of this tube
until it is sized for the particular end purpose. Seamless is a costly
method of manufacture; restricted both in size of outside diameter and
in length.


Generally used as boiler tubing.



On Sun, 06 Apr 2008 17:22:46 -0400, clare at snyder dot ontario dot
canada wrote:

On Sun, 06 Apr 2008 02:40:08 GMT, Dan@ (Dan ) wrote:

What is DOM?
Drawn ove mandrel.
It is electrically welded tubing that "thinks" it is seamless.
Perfectly round bore with no weld bead - also known as structural
tubing - in contrast to Sched 80 PIPE which has a discernable welded
seam and is only "nominally" sized.

--
Posted via a free Usenet account from http://www.teranews.com



--
Posted via a free Usenet account from http://www.teranews.com