| met. |
clean iron (【技】含碳量小于 0.02% 的铁碳合金。性软，延性极好。但极少的碳能使其产生明显的固溶强化作用。微量的硫、磷亦能对其性能产生重要影响。采用区域熔炼生产的纯铁纯度可达99. 99% 。); pure iron (① When carbon is alloyed with iron, the hardness and strength of the metal increases; for example, a steel containing 0.4 per cent of carbon may be twice as strong as pure iron, and with about 1.0 per cent carbon, nearly three times as strong, though as the carbon content rises, the ductility is reduced. 碳与铁形成合金时，金属的硬度和强度就会提高，例如，含碳量0.4%的钢，其强度是纯铁的两倍，含碳量1.0%的钢，其强度约是纯铁的三倍。但是随着含碳量的增加，钢的延展性会降低。 ②If pure iron is gradually heated from room temperature to bright yellow heat, but not melted, the arrangement of the iron atoms changes from body-centred to face-centred cubic at 906°C. 如果将纯铁逐步从室温加热到亮黄色温度，但又未熔化，那么铁原子的排列就会在 906°C 时由体心立方晶格转变为面心立方晶格。) |
