Difference between 10WF21 and 10WF21-S?

[joedirt9]

looking at some drawings and there are a bunch of old steel on here. There is 10WF21 and 10WF21-S listed and I was wondering what the difference was. Any ideas?

 

[bridgebuster]

Could the "S" stand for silicon steel, which would have a higher yield strength than ordinary carbon steel? I'm currently working on a project - built 60+ years ago - that uses this designation.

 

[joedirt9]

This was built about 60 years ago so the "S" could mean any number of things. I just don't know what those are. Silicon steel sounds like a good starting point. Will do a little research.

 

[DST148]

I have a Catalog - "Iron & Steel Beams, 1873 to 1952", compiled by AISC and published in 1953. The letters preceding the date designate the company that issued the catalog, as follows:

B ------- Bethlehem Steel Company 1907
C ------- The Carnegie Steel Company, Limited 1893 to 1896
S -------- Bethlehem Steel Company, Beginning 1909
U S -------- United States Steel Company
........... and so on.....
For 10WF21, there is S43 - 1933 and S47 - 1934

You may also search

http://www.aisc.org

for data on shapes which are no longer rolled.