What is a "B" mark on Steel? 4

[mann]

I am looking at the plans for a steel frame and masonry building from 1964. Several of the beams use a notation as follows: 10 B 11.5. Is that a Wide flange section?

 

[eureka]

10B11.5 is a light weight rolled section similar in appearance to a WF section. They appear in the AISC Steel Handbook of Sixth Edition and earlier.

The properties are as follows:

Depth 9.87"
Flange Width 3.950"
Flange Ave Thk 0.204"
Web Thk 0.180"

Area 3.39
d/Af 12.3
Ixx 51.9
Sxx 10.5
rx 3.92
Iyy 2.01
Syy 1.02
ry 0.77

 

[Qshake]

From the reference: Iron and Steel Beams 1873 to 1952 published by AISC, there were many designations given to beams before standard rollings were adopted. In other words, each steel mill would roll a slightly different shape. Some of the designations follow.

B - Bethlehem Steel Company
C - The Carnegie Steel Company, Ltd 1893 - 1896
C - Carnegie Steel Company 1900-1934
CA - Cambria Steel Company
CAM - Cambria Steel Company
CIL - Carnegie-Illinois Steel Corporation
CP - Carnegie Phipps & CO. Limited
IL - Illinois Steel Company
IN - Inland Steel Company
.
.
.
US - United States Steel Company

The above reference is invaluable for working with older structures as it not only contains properties but also stresses of those mill products.