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Description / Abstract:
This specification covers Grades 50 [345] and 65 [450] alloy steel "W"
shapes (rolled wide flange
shapes) intended for use in building framing. This steel is a low
carbon, copper-containing, alloy
steel with a bainitic microstructure that is developed through the
control of chemical composition
and the use of thermo-mechanical rolling followed by air cooling. The
copper is present to enhance
precipitation strengthening.
When the steel is to be welded, a welding procedure suitable for the
grade of steel and intended
use or service is to be utilized. See Appendix X3 of Specification A
6/A 6M for information on
weldability.
The shapes are not intended to be galvanized or to be post-weld heat
treated at temperatures
exceeding 750 °F [400 °C].
The values stated in either inch-pound units or SI units are to be
regarded separately as standard.
Within the text, the SI values are shown in brackets. The values
stated in each system are not
exact equivalents; therefore, each system is to be used independently
of the other, without
combining values in any way.
The text of this specification contains notes or footnotes, or both,
that provide explanatory
material; such notes and footnotes, excluding those in tables and
figures, do not contain any
mandatory requirements.