耐酸鋼の探究
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概要
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To obtain some alloy steels which can resist to the action of nonoxidizing acids such as HCl and H_2SO_4, several special elements were added to the 0.2% C steel. Cu, Ni, Mo and W were selected as the adding elements, because these elements increase the resistance of steel to the above mentioned acids and comparatively cheap. These elements were added to the 0.2% C steel individually or combined 2, 3 or 4 together. The weight decreases in 10% HCl, H_2SO_4, conc. HCl (at room temperature respectively) and 30% H_2SO_4 (at 80℃) were determined concerning about 170 specimens. The results obtained are summarized as follows. In the case of 10% acid solutions ; 1. When the elements are added individually, Cu, Mo and W give. a remarkable rise of acid-resistance in their small addition and nearly no effect more than 1% addition, while the rise of acid-resistance by Ni is very gradual and the effect of 10% Ni is equal to that of 0.25% Cu, 2. In the combination of 2 adding elements many excellent alloys were found in Fe-Cu-Ni system but no promising alloys in Fe-Cu-Mo, Fe-Cu-W, Fe-Ni-Mo, Fe-Ni-W and Fe-Mo-W system, only the steels containing appreciate amount of Cu or Ni and small quantity of Mo or Ware resistant to HCl, 3. In the combination of 3 adding elements the alloys of Fe-Cu-Ni system become more resistant to HCl by the addition of small amount of Mo or W but not to H_2SO_4. 4. Finally the auther recommend the following alloy steels as most resistant materials, low C steel containing 3-5% Cu, 10-15% Ni, 0.5% Mo and W respectively for dil. or medium conc. HCl and that containing 5% Cu, 15% Ni and 2-3% Mo for dil. or medium conc. H_2SO_4. In the case of conc. HCl and hot 30% H_2SO_4 a very low C steel was used as the ground material, the alloy steel containing 30% Ni, 5% Cu, Mo and W respectively is most resistand to conc. HCl and that containing 30% Ni, 5% Cu and 3% Mo to hot 30% H_2SO_4. Moreover these acid resisting alloy steels were compared with monel metal, nichrome and 18-8 Cr-Ni steel by immersing them in acids of various conc. for 30 days and proved their superiority to the latters.
- 社団法人日本鉄鋼協会の論文
- 1932-02-25
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