Iron has something to do with futures. Shanghai has steel futures. You can download Wenhua financial futures software to see the comparison between the weekly rise and fall of steel and the spot. Generally speaking, hedging is expected to be more than two months. For example, if the futures price is 5,000 tons, and the steel cost in your hand is only 3,500, you can sell it in the futures market at 5,000 to build a position and maintain the value through sales. If the futures price is lower than the normal level, you can buy on it.