Eastern China (Shanghai):
3,930-3,950 yuan ($561-564) per tonne, down 10-20 yuan per tonne
Northern China (Tangshan) - weekly assessment:
3,790-3,830 yuan per tonne, up 20-30 yuan per tonne
Trading across China was thin on Friday, with buyers in wait-and-see mode amid a slump in the futures market caused by the tit-for-tat measures by the US and China, after the US closed China's consulate in Houston, Texas, prompting China to close the US consulate in Chengdu, Sichuan, in retaliation.