Mike Spencer wrote:
"Jim Wilkins" wrote:

I think your 'extruded' angle is hot-rolled steel, the 'formed'
angle is cold-rolled. Is it smooth and zinc-plated? Typically
cold-rolled has a higher yield point since it has already been
deformed and moved up the stress-strain curve by the rolling
process, while hot rolled steel is in the softer annealed condition.

Moreover, hot rolled angle has a fillet on the inside of the angle
that gives extra strength there.

Angle made by forming sheet doesn't have that. I have no idea how
commercial quantities are made. I'd surmise: by rolling or drawing a
strip. But no fillet in any case.



One could make a larger bend radius, which would be like having a fillet.

--

Richard Lamb
http://www.home.earthlink.net/~cavelamb
http://www.home.earthlink.net/~sv_temptress