Is the publication of "Stelco Today" still continuing?What is its
address? Who holds the copyright to material in this publication?

Hi godot1896,

I appears that Stelco Today is no longer being published.  A few
libraries in Canada have archival copies of the trade magazine
(notably CISTI, which has materials from the 1980s), but no one has a
continuing subscription, according to WorldCat.

Stelco was published by the Steel Company of Canada, or Stelco.  The
corporate address is PO Box 2030, Hamilton, Ontario, L8N3T1, Canada. 
The web address is http://www.stelco.com.

- librariankt