Major trading firms: Starting from the settlement on August 22, 2017 (Tuesday), the minimum trading margin standard for coke and coking coal futures contracts was adjusted to 12% of the contract value.

Starting from the trading time on August 22, 2017 (that is, the night trading period on the evening of the 21st), non-futures company members and customers must not exceed 6,000 lots on the 1801 and 1805 contracts for iron ore varieties in a single trading day. There is no limit on the number of open positions for hedging transactions.