The majority of steel is made from recycled material, however,
that does not completely define the composition of the steel, at least not
in the US. The steel has to meet the requirements of the properties
defined in the ASTM standards, and the recycled material is only one
component that is used to make a particular steel. "Billet-steel"
basically defines a process. Most steel is cast into "billets" or
"blooms" initially. I'm not sure of the exact dimensions but I think a
billet is the rang of a 4"x4" solid cross section; I think blooms are
bigger, maybe 6"x6". The rebar is then processed from the
billets. Because it comes from a billet does mean that it is brittle
or non-weldable. Here in the US both A615 and A706 rebar are made
from "billet-steel". A615 is not weldable, A706 is weldable.
Neither are brittle.
Neil Glaser, P.E.
> Here's one that should perhaps have Canadian engineers
questioning. > Maybe the list in general can educate me. In the concrete
standard CSA > A23.3-94 under Clause 1.3 "Reference Publications" we
have the > following. CAN/CSA-G30.18-M92: Billet-Steel for
Concrete > Reinforcing My understanding is that "billet-steel" is steel
made from > re-cycled steel products and that the composition is such
that the > steel is relatively brittle and also not weldable. If
that is the > case why do we accept this as is the steel to use for
Limit States > Design with respect to getting plastic deformations or
ductilities > that allow the assumptions attached to the attainment of
fy? Why > don't we use "weldable steels" that are more malleable
for reinforcing > bars? > Thor A Tandy P.Eng, MCSCE >
Victoria BC > Canada