根据美国钢铁学会的统计,美国1989年将废钢回收到新钢的用量大约7200万吨,等于国内炼钢厂和铸钢厂成品的77.3%. 美国1989年废钢的总用量约8400万吨.除了5520万吨用在炼钢炉里外,约有1700万吨用在铸钢厂,1200万吨由美国出口用在外国. 美国每年回收的钢比所有其他的组合材料(其他 According to the statistics of the American Iron and Steel Institute, in 1989, the U.S. recycled about 72 million tons of scrap steel into new steel, equivalent to 77.3% of domestic steel mills and cast steel products. In the United States, the total amount of scrap used in 1989 was about 84 million tons. 55.2 million tons are used outside the steelmaking furnace, about 17 million tons are used in the steel plant, and 12 million tons are exported by the United States for use in foreign countries. The United States recycles more steel annually than all other combinations (others