Home Business South Korean steelmaker POSCO warns of rising costs after first-quarter profit drop Business South Korean steelmaker POSCO warns of rising costs after first-quarter profit drop By Genpie - April 24, 2019 278 0 Facebook Twitter Google+ Pinterest WhatsApp South Korean steelmaker POSCO on Wednesday said its first-quarter operating profit slid 19 percent from a year earlier amid higher costs for raw materials, matching analyst forecasts.