SMM, April 21: the current contract of electrolytic copper in North China today rose 250 yuan / ton to 310 yuan / ton, with a transaction price of 41880 yuan / ton to 42360 yuan / ton. Overnight crude oil prices fell sharply, US crude oil May contract negative value for the first time, triggered pessimistic expectations of demand, the overall trend of commodities is still weak, copper prices plummeted to 42000 yuan / ton below as low as 41600 yuan / ton line, copper prices fell to attract some downstream buying. Recently, the demand for cable orders from the State Grid has resumed and increased, and orders from copper rod processing plants in North China have performed well. As a result, the processing fees of copper rod factories have risen sharply, from 750 yuan / ton to 950 yuan / ton. At the same time, a number of smelters in the north have been centrally overhauled and electrolytic copper supply is tight, so rising water continues to push up strongly, to more than 300 yuan / ton.