据统计,铌在钢中的应用占铌总用量的80％以上。炼钢所用的铌产品,95％以上是以铌铁形式加入的。铌在钢中的主要作用有: (1) 提高钢的强度和屈服极限。在大多数低合金铌钢中,含铌量为0.015～0.05％;含铌量每增加0.01％,钢的抗拉强度就提高1～4千克力/毫米~2,屈服强度提高4～7千克力/ According to statistics, the application of niobium in steel accounts for more than 80% of the total amount of niobium. More than 95% of the niobium used in steelmaking is added as ferroniobium. The main role of niobium in steel are: (1) increase the strength and yield limit of steel. In most low-alloy niobium steels, the niobium content is 0.015-0.05%; for every 0.01% niobium content, the tensile strength of the steel is increased by 1-4 kgf / mm2 and the yield strength is increased by 4-7 kg force/