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在1600℃、常压Ar气氛下，向钢液中分别加入NH4及（NH4)2C2O4，将400g钢水含铜量从0．5％分别降至0．31％及0.38％仅用脱铜剂07～0．8g．然而，如果不降低体系的压力，在相同条件下用铵盐脱铜很难将钢含量降至0．30％以下．
In 1600 ℃, atmospheric pressure Ar atmosphere, respectively, to the molten steel were added NH4 and (NH4) 2C2O4, 400g of molten steel from 0.5% copper content decreased to 0.31% and 0.38% only copper removal agent 07 ~ 0.8g. However, it is difficult to reduce the steel content to less than 0.30% by copper removal with ammonium salt under the same conditions without reducing the system pressure.