Study of the Structure and Properties of High-Chromium Cast Irons and Stainless Steels for Chemical Production Pumps

The structures and phase compositions of highly-alloyed corrosion-resistant cast irons ChKh22 and ChKh20M, and also stainless steels 10Kh24N19G2M (austenitic) and 20Kh28N8AM3D3S (austenitic-ferritic) are studied by optical and scanning electron microscopy, x-ray diffraction analysis, and hardness measurement. Variation of the phase composition during steel crystallization is analyzed. Corrosion behavior of the alloys in a 3% aqueous NaCl solution is studied by potentiometric and potentiodynamic analysis, and frequency response spectroscopy methods. Recommendations are developed for use of the alloys for preparing chemical pump components. Heat treatment regimes are proposed for improving alloy resistance to overall, pitting, and intergranular corrosion, corrosion cracking, and corrosion-erosion.

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Correspondence to R. S. Fakhurtdinov.

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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 43 – 49, February, 2020.

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Fakhurtdinov, R.S., Puchkov, Y.A., Degtyareva, A.G. et al. Study of the Structure and Properties of High-Chromium Cast Irons and Stainless Steels for Chemical Production Pumps. Met Sci Heat Treat (2020).

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Key words

  • stainless steels
  • corrosion-resistant cast irons
  • chemical product pumps