FINALLY found documentation of the date of the founding of Crucible Steel Co. of American, and the works that were combined to form the company

13 companies formed Crucible Steel Co. of America
July 21, 1900, with headquarters in Pittsburgh.
http://www.crucibleservice.com/history.aspx Crucible Steel Co. of America was a consolidation of the following companies
https://books.google.com/books?id=xdk5AQAAMAAJ&pg=PA254&lpg Aliquippa Steel Co.
Anderson, Du Puy & Co.
Benj. Atha & Illingworth Co.
Beaver Falls Steel Works
Canton Steel Works
Cayuga Tool Steel Works
Consumers’ Heating Co.
Crescent Steel Works
Cumberland Steel & Tin Plate Co.
Howe, Brown & Co.
La Belle Steel Works
Park Steel Works
Sanderson Bros. Steel
Singer, Nimick & Co.
Spaulding & Jennings Co.
Norwalk Steel Co. was incorporated by Crucible in 1910
In 1911, Midland Steel Co. was purchased and became Pittsburgh Crucible Steel Co.
In addition to Sanderson Bros. Steel Works in Syracuse, New York, Crucible operated the following steel works in 1902.
https://books.google.com/books?id=2yYqAAAAYAAJ&pg=PA331&lpg PennsylvaniaAluquippa Steel Works
Beaver Falls Steel Works
Black Diamond Steel Works
Crescent Steel Works
Howe, Brown & Co. Works
La Belle Steel Works
Pittsburgh Steel Works
Singer, Nimick & Co. Works
New JerseyAtha Steel Co.
West Bergen Steel Works
I still don't think any of them made the "rough forged barrel tubes", but
did provide the AISI 1020 action forgings. Sad thinking about what has become of the steel industry in the U.S.