Copper alloy, semi-finished product and electrical connection element comprising copper alloy

The invention relates to a copper alloy having the following components in% by weight: Sn: 3.0%-6.5%, Ni: 0.30%-0.70%, P: 0.15%-0.40%, S: 0.10%-0.40%, Zn: optionally up to 0.20%, Fe: optionally up to 0.50%, Mn: optionally up to 0.50%, Pb: optionally up to 0.25%, the remainder being copper and unavoidable impurities, where the ratio of the fraction of Ni to the fraction of P is at least 1.1 and up to 2.8, and where the balance is copper and unavoidable impurities. The alloy comprises nickel phosphide. 本发明涉及一种具有按重量计％的以下组分的铜合金：Sn：3.0％-6.5％，Ni：0.30％-0.70％，P：0.15％-0.40％，S：0.10％-0.40％，Zn：任选地，高达0.20％，Fe：任选地，高达0.50％，Mn：任选地，高达0.50％，Pb：任选地，高达0.25％，余量的铜和不可避免的杂质，其中Ni的分数与P的分数的比率是至少1.1，并且至多2.8，并且其中，合金包含磷化镍。