Shanghai nickel futures slid as much as 6.8% to 205,880 yuan a tonne, further weighing on stainless steel prices.
Other steel products on the Shanghai bourse also extended falls, with construction material rebar, for October delivery, ending down 0.7% to 4,829 yuan per tonne.
Spot prices of iron ore with 62% iron content for delivery to China , compiled SteelHome consultancy, fell for a fourth consecutive session and stood at $139 a tonne on Monday, the lowest since end-February.
Coking coal prices inched 0.2% lower to 2,911 yuan a tonne, and coke futures fell 2.2% to 3,634 yuan per tonne.