Publication detail
Corrosion Resistance of Cast Duplex Steels
MÜLLER, P. PERNICA, V. KAŇA, V.
English title
Corrosion Resistance of Cast Duplex Steels
Type
journal article in Web of Science
Language
en
Original abstract
The aim of this work is to investigate the resistance of cast duplex (austenitic-ferritic) steels to pitting corrosion with respect to the value of PREN (Pitting Resistance Equivalent Number). Pitting corrosion is one of the most common types of corrosion of stainless steels. In most cases, it is caused by the penetration of aggressive anions through the protective passive layer of the steel, and after its disruption, it leads to subsurface propagation of corrosion. The motivation for the research was a severe pitting corrosion attack on the blades of the gypsumcalcium water mixer in a thermal power plant operation. In order to examine the corrosion resistance, 4 samples of 1.4517 steel with different concentrations of alloying elements (within the interval indicated by the steel grade) and thus with a different PREN value were cast. The corrosion resistance of the samples was evaluated by the ASTM G48 – 11 corrosion test in a 6% aqueous FeCl3 solution at room and elevated solution temperatures. To verify the possible effect of different alloying element concentrations on the mechanical properties, the research was supplemented by tensile and Charpy impact tests. Based on the results, it was found that a significant factor in the resistance of duplex steels to pitting corrosion is the temperature of the solution. For the components in operation, it is therefore necessary to take this effect into account and thoroughly control and manage the temperature of the environment in which the components operate.
English abstract
The aim of this work is to investigate the resistance of cast duplex (austenitic-ferritic) steels to pitting corrosion with respect to the value of PREN (Pitting Resistance Equivalent Number). Pitting corrosion is one of the most common types of corrosion of stainless steels. In most cases, it is caused by the penetration of aggressive anions through the protective passive layer of the steel, and after its disruption, it leads to subsurface propagation of corrosion. The motivation for the research was a severe pitting corrosion attack on the blades of the gypsumcalcium water mixer in a thermal power plant operation. In order to examine the corrosion resistance, 4 samples of 1.4517 steel with different concentrations of alloying elements (within the interval indicated by the steel grade) and thus with a different PREN value were cast. The corrosion resistance of the samples was evaluated by the ASTM G48 – 11 corrosion test in a 6% aqueous FeCl3 solution at room and elevated solution temperatures. To verify the possible effect of different alloying element concentrations on the mechanical properties, the research was supplemented by tensile and Charpy impact tests. Based on the results, it was found that a significant factor in the resistance of duplex steels to pitting corrosion is the temperature of the solution. For the components in operation, it is therefore necessary to take this effect into account and thoroughly control and manage the temperature of the environment in which the components operate.
Keywords in English
Cast duplex steel; Pitting resistance equivalent number; Ferric chloride; Critical pitting temperature; Mechanical properties
Released
03.08.2022
Publisher
POLSKA AKAD NAUK, POLISH ACAD SCIENCES
Location
WARSZAWA
ISSN
2299-2944
Volume
2022
Number
3
Pages from–to
5–10
Pages count
6
BIBTEX
@article{BUT182312,
author="Peter {Müller} and Vítězslav {Pernica} and Václav {Kaňa},
title="Corrosion Resistance of Cast Duplex Steels",
year="2022",
volume="2022",
number="3",
month="August",
pages="5--10",
publisher="POLSKA AKAD NAUK, POLISH ACAD SCIENCES",
address="WARSZAWA",
issn="2299-2944"
}