In article PEycf.2190$Id6.1528
@newsread1.news.pas.earthlink.net,
says...
Since you are talking metric sizes, you are probably on the continent.
In the US those would be 6" to 9" a bit over 10' long, a VERY standard
size in the construction industry. As some else mentioned, check with
the steel suppliers but with special attention to those that service the
construction trades. You should be able to get someone to cut to length,
hit is with a coat of red primer, and deliver it to the job site for
quite nominal costs. (Perhaps double the going price of prime steel per
pound, cutting and delivery included.)

'T' beams are going to be an tough one. I'd just have the supplier cut
the flange off as part of the deal.

I think that's the only way to get a Tee bar. The
structural tees in the AISC Steel Construction Manual are
described as "Cut from W shapes."

Ned Simmons