Use of Chromium-Manganese Corrosion-Resistant Steel in District Heating Network Applications

• Published in: Metal science and heat treatment Vol. 65; no. 3-4; pp. 159 - 166
• Main Authors: Sorokina, S. A., Vorob’ev, R. A., Gorshunov, M. G., Chernigin, M. A.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-07-2023; Springer; Springer Nature B.V
• Subjects: Apartment buildings; Characterization and Evaluation of Materials; Chemical composition; Chemistry and Materials Science; Chromium manganese steels; Classical Mechanics; Corrosion; Corrosion resistance; Corrosion resistant steels; Diamond pyramid hardness; District heating; Engineering Thermodynamics; Heat and Mass Transfer; Macrostructure; Martensitic transformations; Materials Science; Metallic Materials; Network software; Nickel chromium steels; Nickel steel; Nickel steels; Pipes; Steel; Water supply; corrosion-resistant steel; corrosion damage; strain martensite; austenite; scratch testing
• ISSN: 0026-0673; 1573-8973
• DOI: 10.1007/s11041-023-00908-z

A fragment of a pipe from a chromium-manganese steel of type 12Kh15G9ND (AISI 201) is studied after 1.5 years of operation in an apartment building. The chemical composition of the steel is determined. The Vickers hardness of straight and curvilinear parts of the pipe is measured. The temperatures
M
s
and
M
d
of martensitic transformations are computed. The macrostructure and the microstructure of the steel are studied. Places of through corrosion damage and causes of their formation in hot water supply (HWS) pipes are analyzed. A method of scratch testing is suggested for assessing the surface condition. The adhesive properties of the coating are estimated. It is inferred that steel 12Kh15G9ND is suitable for service in HWS systems and that total replacement of the chromium-nickel steel in pipelines by a chromium-manganese corrosion-resistant one requires further study.