Effect of Silicon Addition on Corrosion Resistance and Mechanical Properties of Fe-Ni Alloys (Study on Corrosion-Resistant Alloy, 1st Report)

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  • Uto Yoshimitsu
    The Laboratory of Mitsubishi Shipbuilding & Engineering Co., Ltd.
  • Kitajima Hyoma
    The Laboratory of Mitsubishi Shipbuilding & Engineering Co., Ltd.
  • Kai Toshio
    The Laboratory of Mitsubishi Shipbuilding & Engineering Co., Ltd.

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  • Fe-Ni系合金の機械的性質と耐食性におよぼすSiの影響
  • Fe-Niケイ ゴウキン ノ キカイテキ セイシツ ト タイショクセイ ニ オヨボス Si ノ エイキョウ

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Abstract

Lead, high silicon cast irons and high nickel super alloys (Hastelloy D) have conventionally been used as materials corrosion-resistant against sulfuric acid. Since such materials, however, possess poor casting and mechanical properties as well as economical deficiencies, it has become necessary to produce a new Fe-Ni-Si alloy highly resistant to corrosion and abrasion. Various tests have been conducted adding silicon, copper, molybdenum, alminium, chromium or their compounds to Fe-Ni alloy base. In the present paper the effects of silicon addition to Fe-Ni alloy is put in relief. Measurements of hardness, transverse breaking, micro structure and corrosion resistance in sulfuric acid or hydrochloric acid of the alloys were carried out. From the measurement, the following results have been obtained. (1) The mechanical properties of Fe-Ni-Si alloy were principally dependent upon silicon contents. In order to get alloys of which the mechanical properties are superior than or at least equivalent to Hastelloy D, it is necessary to keep the silicon contents below 10%. (2) The alloys with the composition of Fe 0∼70%, Si 5∼10% and residual Ni have been found usable in 0∼85% sulfulic acid at the temperatures up 80°C and in 0∼10% hydrochloric acid up to 40°C.

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