SMM, April 20: the current contract of electrolytic copper in North China today rose by 230 yuan / ton to 300 yuan / ton, and the transaction price was 42630 yuan / ton to 42930 yuan / ton. Shanghai copper low open high to 42600 yuan / ton above. Smelter shipments less, quotation in the rising water 300 yuan / ton, traders shipment is not much, quotation 300 yuan / ton ~ liter 350 yuan / ton, North China electrolytic copper goods tight price is high; according to SMM understanding, generally Shanghai and North China price difference in 150 yuan / ton can be transferred, the current transfer space reflects, it is reported that individual traders come to Shanghai to buy goods to Tianjin, if the price difference continues to expand, the transfer ratio will gradually increase.