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为了开发一种适用于汽车排气管的高耐热、高成形性的不锈钢,调查研究了Mo和Si对15％Cr铁素体不锈钢的成形性、高温强度和抗氧化能力的影响。添加Mo对提高抗氧化能力和高温强度有明显作用。添加Si对提高抗氧化能力有作用,但发现对提高高温强度实际上无作用。根据这些研究结果,开发出了一种耐热性和成形性极佳的新的加Mo铁素体不锈钢。这种新的钢JFE-MHI(15％Cr-0．3％Si-0．5％Nb-1．6％Mo)兼具了现有两种钢(高成形性型和高耐热型) 的所有优点。特别是,JFE-MHI薄钢板和电阻焊管显现出其成形性达到了与现有高成形性不锈钢JEF429EX(15％Cr-0． 9％Si-0．5％Nb)同等的水平,而其高温强度、高温疲劳性能和热疲劳性能均优于现有高耐热不锈钢JFE434LN2(SUS444: 19％Cr-0．3％Si-0．3％Nb-1．9％Mo)。
In order to develop a high heat-resistant, high-formability stainless steel suitable for automotive exhaust pipes, the effects of Mo and Si on the formability, high-temperature strength and oxidation resistance of 15% Cr ferritic stainless steel were investigated. Mo added to improve the antioxidant capacity and high temperature strength have a significant role. The addition of Si has an effect on improving antioxidant capacity, but found to have virtually no effect on increasing high temperature strength. Based on these findings, a new Mo-added ferritic stainless steel having excellent heat resistance and formability was developed. The new steel, JFE-MHI (15% Cr-0.3% Si-0.5% Nb-1.6% Mo) combines the two existing steels (high formability and high heat resistance) All the advantages. In particular, the JFE-MHI steel sheets and ERWs exhibit formability up to the same level as the existing high-formability stainless steel JEF429EX (15% Cr-0. 9% Si-0.5% Nb) Strength, high-temperature fatigue properties and thermal fatigue properties are superior to the existing high heat-resistant stainless steel JFE434LN2 (SUS444: 19% Cr-0.3% Si-0.3% Nb-1.9% Mo).