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随着金属材料产量的增长,需热处理的材料比重也增大。1970年世界钢产量约6亿吨,需热处理的钢材为6200万吨。预计2000年世界钢产量将达17.5亿吨,其中需热处理的钢将达5.6亿吨。钢产量增加到2.9倍,而需热处理的钢材却增到加9倍。各种热处理工艺目前(1975年)在欧美国家的发展情况列于表1。表2所列为某一工业化国家今后各种热处理工艺的发展趋势估计。
As the metal material production increases, the proportion of the material to be heat treated also increases. In 1970, the world’s steel production was about 600 million tons, and the heat-treated steel was 62 million tons. It is estimated that the world steel output will reach 1.75 billion tons in 2000, of which 560 million tons will be required for heat treatment. Steel production increased to 2.9 times, while the heat treatment of steel has increased to 9 times. The various heat treatment processes (1975) in Europe and the United States are listed in Table 1. Table 2 shows the future development of various heat treatment processes in an industrialized country.