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The effect of long term service at elevated temperatures on microstructure degradation of austenitic reformer tubes

Łabanowski J., Jurkowski M., Landowski M.

Advances in Materials Science

2018

Vol. 18, nr 2(56)

27--36

The paper analyses the relationship between an increase of the inner diameter of tubes made of Manaurite XM cast steel and transformations occurring in their microstructure due to long-lasting operation in methane reformer. Examinations included metallographic analysis with light microscope (LM), scanning electron microscope (SEM) and microanalysis of the chemical composition of precipitates (EDX). It was indicated that there is a relationship between the microstructure degradation ratio, morphology of the precipitates and an increase of the inner diameter of the tubes.

Effect of Long Term Service at Elevated Temperatures on Mechanical Properties of Manaurite XM Reformer Tubes

Łabanowski J., Jurkowski M., Landowski M.

Advances in Materials Science

2016

Vol. 16, nr 4(50)

38--44

Microstructure transformations occur in the Manaurite XM cast steel tubes during long-term operation in the reformer furnace were revealed and described. The relationship between mechanical properties, an increase of internal diameter of the tube and microstructure degradation is discussed. Static tensile test was performed on two types of samples with different shapes. It has been shown differences in the results of tests and an explanation of this phenomenon.

Assessment of structural changes at IN-519 cast steel reformer tubes

Łabanowski J.

Advances in Materials Science

2005

Vol. 5, nr 1-3

14-20

Catalytic tubes are the most important parts in reformer furnaces at ammonia chemical plants. A steam reforming process converts hydrocarbons into mixtures of hydrogen, carbon monoxide and carbon dioxide. This reaction proceeds at a temperature range 800-900 °C and under pressure 3 - 4 MPa. This severe working condition causes a structural damage in the tubes. It is necessary to develop reliable methods for inspection of tube degradation and for realistic prediction of its residual life. The paper presents effects of long-term service at elevated temperatures on microstructural changes of the alloy IN-519 (24%Cr, 24%Ni, Nb).