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国际经济萧条导致飞机生产数量明显缩减。飞机产量下滑，使其原材料供应市场也受到了冲击，美国钛市场也不景气，产量减少，进口量下降。 据美国地质勘查局提供的数据，1999年海绵钛的平均价格已由1998年的9.7美元/kg下跌到了9.4美元/kg。总消费量大约为2.64亿美元，其中60%用
The international economic recession led to a significant reduction in the number of aircraft production. The decline in aircraft production has also affected the supply of raw materials. The titanium market in the United States has also been sluggish. Production has decreased and imports have fallen. According to data provided by the US Geological Survey, the average price of titanium sponge in 1999 fell from 9.7 US dollars/kg in 1998 to 9.4 US dollars/kg. The total consumption is about 264 million U.S. dollars, 60% of which