In the local Turkish steel plate spot market, traders' prices for stock material St37 grade 15-40 mm x 1,500 mm steel plate in Turkey's Gebze and Eregli regions have decreased by $30/mt over the past two weeks to $520-530/mt ex-warehouse and $510-520/mt ex-warehouse, respectively, both for advance payments and excluding 18 percent VAT, for September deliveries.