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钢中加入少量铌,能提高钢的屈服强度和冲击韧性,降低其脆性转变温度,并改善其焊接性能。铌如与钼、钨、钒联合使用,则更能提高钢的热强性,改善钢的抗蠕变性能。因此,准确分析出含铌钢中的铌成分则是相当重要的。 自1991年以来,长特四厂在用光电直读与化学分析(国家标准)测定该厂冶炼的 10MoWVNb钢中的铌成分时,总是光电直读分析的Nb％结果比化学分析结果偏低大约0.007左右,尽管分析工作者是经验丰富的老同志也概莫能外。为此,给该厂冶炼含铌钢带来了不少困难和麻烦。使冶炼工作者难于控制炼钢炉中的铌成分。如果选用化学分析法,显然分析速度不行。为此,必须将光电直读分析的Nb％结果仲裁鉴定。光电直读与化学分析测定的铌结果到底哪个准?光电直读分析结果系统偏低的原因何在?必须尽快解决这一实际问题已成了长特四厂冶金分析工作者们的燃眉之急。
Adding a small amount of niobium to the steel increases the yield strength and impact toughness of the steel, decreases its brittle transition temperature, and improves its weldability. When niobium is used in combination with molybdenum, tungsten and vanadium, the thermal strength of the steel is improved, and the creep resistance of the steel is improved. Therefore, it is quite important to accurately analyze the niobium component in niobium-bearing steels. Since 1991, when using the direct reading and chemical analysis (national standard) for the determination of niobium in the 10MoWVNb steel refined by this plant, the Changte 4 Plant always has a lower Nb% result than the direct result of chemical analysis About 0.007 or so, even though the analyst is an experienced veteran. To this end, the plant smelting niobium-bearing steel has brought a lot of difficulties and troubles. Smelting workers difficult to control the niobium composition of steel furnace. If you use chemical analysis, it is clear that the analysis speed. For this reason, the Nb% results of photoelectric direct reading analysis must be arbitrated. Optical direct reading and chemical analysis of niobium results in the end which quasi? Optical direct reading analysis of the reasons for the system is low? As soon as possible to solve this practical problem has become a special steel plant in Changte 4 metallurgical analysis workers in desperate need.