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在奥氏体不锈钢的领域中,具有高N含量的Cr-Mn钢牌号变得越来越重要。工业生产设施可以采用两种方法来达到高氮含量。第一种方法涉及利用加压的电渣重熔工艺的优点,这种工艺在高的N分压下操作;而第二种方法是添加能增加氮在熔体中溶解度的元素,从而可在大气压力下实现高的N含量。本文着眼于N溶解度和奥氏体稳定性。这些,对于成功地实施和生产高合金Cr-Mn奥氏体钢来说,已经被认为是重要的而且在有些情况下是制约因素。借助使用Cr和Ni当量的等式可以预测出一种稳定的奥氏体显微组织的先决条件。采用不同的配方进行了试验,而且对它们的结果与合金的显微组织进行了比较。N在熔体中的溶解度对于在大气条件下浇注的钢种特别重要。已经发现以工业规模在大气压力时可以实现生产高达0．9mass％N的钢种。测试了大气条件下计算熔体中N溶解度的几种理论方法,并与常规浇注的Cr-Mn钢种的化学分析作了比较。
In the field of austenitic stainless steels, grades of Cr-Mn with high N content become more and more important. There are two ways that industrial production facilities can achieve high nitrogen levels. The first method involves the advantage of utilizing a pressurized ESR process that operates at high N partial pressures; and the second one is the addition of an element that increases the solubility of nitrogen in the melt, High atmospheric pressure to achieve the N content. This article looks at N solubility and austenitic stability. These have been considered important and in some cases a constraint for the successful implementation and production of high alloy Cr-Mn austenitic steels. The prerequisites for a stable austenitic microstructure can be predicted by using the equations for Cr and Ni equivalents. Experiments were conducted with different formulations and the results were compared with the alloy microstructure. The solubility of N in the melt is especially important for steels that are cast in atmospheric conditions. It has been found that the production of steels up to 0.9 mass% N can be achieved on an industrial scale at atmospheric pressure. Several theoretical methods for calculating the solubility of N in melt under atmospheric conditions were tested and compared with the chemical analysis of conventional cast Cr-Mn steels.