On the afternoon of May 15, in the afternoon, Taicang's spot reference price was quoted at around 2,320 - 2,320 yuan/ton for outbound cash exchange, with the basis reference value of +90~+100 yuan/ton;5 medium basis difference +70~+75 yuan/ton;5 basis difference +45~+55 yuan/ton, 6 basis difference negotiation +30~+35 yuan/ton;7 offer basis difference 07 contract +40 yuan/ton or negotiation 09 contract +30~+35 yuan/ton.