原子能的应用、火箭的发射、宇宙飞船的上天以及国民經济各个部門的飞速发展,鋼材品种也越來越显得重要了。目前世界上鋼材品种已达一万多种。由于軋鋼技术的发展,一些新的鋼材品种正在不断增加。以軋代鍛、以軋代鑄,在各种技术經济方面也取得了更大的效果。如何使鋼材重量减輕,寿命延长,性能更好,物美而价廉,已成为鋼材品种的发展趋势。鋼材品种发展的第一个特点是輕。送上天的东西輕了,需要动力 The application of atomic energy, the launch of rockets, the astronautics of the spacecraft, and the rapid development of various sectors of the national economy have made steel varieties increasingly important. At present, there are more than 10,000 types of steel products in the world. Due to the development of rolling steel technology, some new steel types are continuously increasing. With rolling forging and rolling casting, it has achieved greater results in various technical and economic aspects. How to reduce the weight of steel, prolong life, better performance, good quality and cheap, has become the development trend of steel varieties. The first characteristic of the development of steel products is light. The things that are sent to heaven are light and need power