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国外高强钢可分成两大类,即低碳贝氏体钢和时效马氏体钢。目前,在压力容器及钢结构制造中,广泛采用屈服强度50～70kg/mm~2级的低碳贝氏体钢,以HY80、T-1钢为代表。60年代,由于探测外层空间的需要,超高强时效马氏体钢发展十分迅速,屈服强度150公斤/毫米~2级以上的钢种全部为时效马氏体钢。目前,150公斤/毫米~2级的钢
Foreign high-strength steel can be divided into two categories, namely, low-carbon bainitic steel and martensitic steel aging. Currently, low pressure bainitic steel with a yield strength of 50-70 kg / mm ~ 2 is widely used in the manufacture of pressure vessels and steel structures, represented by HY80 and T-1 steels. In the 1960s, due to the need of detecting outer space, the ultra-high strength and aging martensitic steel developed very rapidly. All the steel grades with the yield strength of 150 kg / mm ~ 2 were all aging martensitic steel. Currently, 150 kg / mm ~ 2 steel