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日本金属工业公司研制了耐氯化物应力腐蚀,耐孔蚀性优良的铁素体不锈钢NTKU-22。钢在增加了Cr和Mo的添加量,在提高耐蚀性的同时,大幅度降低了碳、氮含量,改善了加工性。如何抑制由氯化物引起的不锈钶应应力腐蚀及孔蚀的发生是最大的课题。该公司认为NTKU-20的耐蚀性是到目前为止最好的。今后将作为暴露于含氯化物腐蚀环境的海洋结构物,化工厂,发电厂等部件用材料进行市场开拓。
Nippon Metal Industries has developed NTKU-22, a ferritic stainless steel that is resistant to chloride stress and corrosion. Steel increases the addition of Cr and Mo, while improving corrosion resistance, while significantly reducing the carbon and nitrogen content, improved workability. How to restrain the stainless steel caused by chloride? Stress corrosion and pitting corrosion is the biggest issue. The company believes that the corrosion resistance of NTKU-20 is by far the best. In the future, it will be exploited as a material for exposure to marine structures, chemical plants, power plants and other components exposed to chloride-containing corrosive environments.