U.S.$2,750,000,000 SENIOR EXPORT AND WORKING CAPITAL FACILITY AGREEMENT among GERDAU AMERISTEEL US INC. and GNA PARTNERS, GP, as Borrowers, GERDAU S.A., GERDAU AMERISTEEL CORPORATION, GERDAU AÇOMINAS S.A., GERDAU ACOMINAS OVERSEAS LIMITED, GERDAU AÇOS...