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Support steel:It is a kind of section steel,as its seciton is similar to the English letter U, it is
often called U steel.Support steel is mainly used for making metal stents and roof support in
mine tunnels, and it is often made to be curved, legs and beams are connected, thus it
can bear greater pressure and load.
There are two kinds of support steel for 25U:flat-bottom(old type,theoretical
weight:24.76kg/m) and circular bottom(new type,theoretical weight:24.95kg/m)