Billet: the transaction of tangshan straight billet was weak on 18th, the warehouse spot quoted 4880-4890 yuan/ton including tax, and some transactions were made.  Downstream finished material prices steady downward, narrow - band transaction in general, steel weak.  Tangshan Qian 'an and Qinhuangdao Lulong area general square billet factory settlement price 4790 lower than last Friday 20, traders including tax transaction price 4880 or so.  It is expected that the billet ex-factory price will run steadily in the afternoon. ...