Dashang set the iron grade of iron ore futures delivery standard at 62%. On the basis of comprehensive consideration of the actual situation of the spot market and the characteristics of financial derivatives, it is determined that the deliverable grade of fine ore and concentrate is more than 60%, of which 60% is less than or equal to the grade of < 62%, and every time the grade is reduced by 0. 1%, the premium is 1.5 yuan/ton; 62%