Futures black began to harvest, which means that the steel-related industries in the futures market began to deliver goods. Futures black is the common name of steel-related industries in the futures market, including rebar, hot coil, wire rod, iron ore and coking coal. The harvest period refers to the date when the goods must be delivered, and the futures black begins the harvest period, which means that the steel-related industries begin to deliver the goods in the futures market.