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1.引言钢筋用途广,用量大,是一种重要的建筑材料。世界各产钢国,每年都要生产大量的钢筋,以满足国民经济的需求。我国钢筋产量也在逐年上升,特别是近几年,由于建筑业的迅速发展,产量上升更快。1982年即超过160万吨,估计1985年产量会达到200万吨以上。即使如此,仍不能满足市场需求,供需缺口仍然很大。一方面市场对钢筋用量要求越来越大,另一方面,对钢筋的性能如强度、塑性、焊接性能、弯曲性能等要
1. Introduction Rebar is widely used, large amount, is an important building materials. Every steel producing country in the world produces a large amount of steel bars each year to meet the needs of the national economy. China’s steel production is also rising year by year, especially in recent years, due to the rapid development of the construction industry, the output rose faster. In 1982, it exceeded 1.6 million tons and it is estimated that the output in 1985 will reach over 2 million tons. Even so, still can not meet the market demand, supply and demand gap is still large. On the one hand the market demand for more and more steel, on the other hand, the performance of steel such as strength, plasticity, welding performance, bending performance, etc.