Re: [CR] 531DB..gas-pipe..and some Reynolds 531 metric tubing

(Example: Framebuilders:Rene Herse)

Date: Fri, 28 Dec 2007 22:41:56 -0600
From: "John Thompson" <john@os2.dhs.org>
To: Classic Rendezvous <classicrendezvous@bikelist.org>
Subject: Re: [CR] 531DB..gas-pipe..and some Reynolds 531 metric tubing
References: <001801c849bd$0ecb9a10$4001a8c0@compaq>
In-Reply-To: <001801c849bd$0ecb9a10$4001a8c0@compaq>


David Snyder wrote:
> Whether Reynolds 531 and other competitive steel tubing is advertised
> as "solid-drawn" I don't know. I don't know exactly what that term
> means, but I suspect that most high-end tubing starts as strip and
> gets welded and manipulated through repeated drawing into something
> ultimately regarded as seamless.

Seamless tubing is produced by piercing a solid piece of steel with a mandrel, and repeated drawing through dies until the final shape and dimensions are achieved.

Some seamed tubing, e.g. Reynolds 501, True Temper, etc, start as strips rolled and welded into tubes and drawn through mandrels to obliterate the weld seam, but AFAIK, 753/531, and most other high-end tubing was produced as truly seamless.

--
John Thompson (john@os2.dhs.org)
Appleton WI USA