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发展预应力混凝土结构关键之一是提供高强度预应力钢筋。我国Ⅳ级钢筋(55/85级) 是预应力用热轧钢筋,由于碳当量高(0.6%～0.7%),难于保证焊接质量,生产难度较大,产量低。因此大都以冷拉Ⅰ级钢筋,冷拉Ⅱ级钢筋作预应力钢筋,它不仅强度低,尚需焊接、冷拉等工序,这是急待解决的课题。利用热处理强化提高钢材性能是既经济
One of the keys to the development of prestressed concrete structures is to provide high-strength prestressed reinforcement. China’s Grade IV steel bar (55/85 grade) is a hot-rolled steel bar used for prestressing. Due to the high carbon equivalent (0.6% to 0.7%), it is difficult to ensure welding quality, and production is difficult and production is low. Therefore, most of them are cold drawn grade I steel bars and cold drawn grade II steel bars used as prestressed steel bars. It not only has low strength, but also needs welding, cold drawing and other processes. This is an urgent task to be solved. The use of heat treatment to enhance the performance of steel is both economical