Effect of Cold Working on Corrosion of Stainless Steel in High Temperature Water

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  • Maekawa Tatsuo
    Engineering and Research Laboratory, Mitsubishi Atomic Power Industries, Incorporated
  • Nagata Sadayoshi
    Engineering and Research Laboratory, Mitsubishi Atomic Power Industries, Incorporated
  • Kagawa Masaru
    Engineering and Research Laboratory, Mitsubishi Atomic Power Industries, Incorporated
  • Nakajima Nobuwo
    Engineering and Research Laboratory, Mitsubishi Atomic Power Industries, Incorporated

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  • ステンレス鋼の高温水腐食におよぼす冷間加工の影響
  • ステンレス コウ ノ コウオンスイ フショク ニ オヨボス レイカン カコウ ノ エイキョウ

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Abstract

The effect of cold-working on corrosion of AISI type 304(or 304L) stainless steels were investigated in high-purity water at 300°C under pressure of 87 kg/cm2. An X-ray diffractometer used to investigate the ferrite formation caused by cold-working. The corrosion results were compared with the corrosion in boiling 65% nitric acid and in boiling copper sulfate-sulfuric acid solution. The results are summarized as follows: (1) The degree of cold working does not seem to have a direct relation to the corrosion resistance of type 304 (or 304L) stainless steel in high temperature water and in boiling 65% nitric acid. (2) The ferrite produced by cold-working accelerates the corrosion in high temperature water. However, the ferrite does not seem to affect the corrosion resistance in boiling 65% nitric acid and in boiling copper sulfate-sulfuric acid solution. (3) The tensile strength measurement indicate the existence of the intergranular attack in high carbon specimens after the test in boiling copper sulfate-sulfuric acid solution. However, no evidence of intergranular attack is found in high temperature water.

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