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通过对不锈钢的高氮化,可期望提高诸如耐蚀性、强度、奥氏体相的稳定化和代替镍之类等在质量和成本方面的效果。但是,若是大气熔炼工艺,大气压下最大的氮溶解度是有限的,即使把氮添加到溶解度,溶解度也会随着凝固而减少,从而发生气孔缺陷,这样不可能制造出健全钢锭。因此,作为在不锈钢中把氮添加到大气压下的溶解度以上的水平的方法,在加压氮气气氛下的
Through high nitriding of stainless steel, it is expected to improve the quality and cost-effectiveness such as corrosion resistance, strength, stabilization of the austenite phase and the like, in place of nickel and the like. However, in the case of the atmospheric melting process, the maximum solubility of nitrogen at atmospheric pressure is limited. Even if nitrogen is added to the solubility, the solubility decreases with the solidification, so that blowhole defects occur, making it impossible to produce a robust steel ingot. Therefore, as a method of adding nitrogen to stainless steel to a level higher than the solubility at atmospheric pressure, under a pressurized nitrogen atmosphere