（－）我国的钢铁企业大部分是五、六十年代建成的，一些较大规模的钢铁企业如鞍钢等历史更早，主体装备框架早在建国前就已经形成。虽然经过几十年的不断发展，这些老企业的规模都不同程度地得到了扩大，但是装备水平仍是参差不齐。接受计划经济体制的制约，这些企业在发展中 (-) Most of the iron and steel enterprises in China were built in the 1950s and 1960s. Some relatively large-scale steel companies such as Anshan Iron & Steel have earlier history. The main equipment framework was formed long before the founding of the People’s Republic of China. Although after decades of continuous development, the scale of these old enterprises has been expanded to varying degrees, but the level of equipment is still uneven. Under the constraints of the planned economic system, these enterprises are in the process of development.