Structure and properties of the centrifugally cast high-alloyed (25Cr35NiNbTi) steel after long-time operation in steam reforming

• Autorzy: Mikułowski B. , Zapała R. , Głownia J. , Wilk P.

Warianty tytułu

PL

Struktura i własności odlewanego odśrodkowo wysokostopowego staliwa (25Cr35NiNbTi) po wieloletniej eksploatacji w reformingu parowym

• Języki publikacji: EN

Abstrakty

EN

The paper presents the influence of performance conditions of high-alloyed nickel-chromium cast steel intended for use in steam reforming plants on the morphology and number of phases present in centrifugally cast tubes. Structure identification was done by the methods of light and scanning microscopy. It was found that the main components of the tested cast steel microstructures are carbides of, among others, chromium, iron, and niobium. The structure has also been reported to contain the sigma phase. Additionally, at three test temperatures (20, 820 and 945°), the mechanical properties of the cast steel were determined after years of operation under industrial conditions. The tested material was characterised by low, compared with standard requirements, mechanical properties. A relationship between the content of phases (primary and secondary carbides), measured by the methods of quantitative metallography, and the yield strength of the tested material was determined. The yield strength determined at room temperature, and at 820° and 945° assumed higher values in samples characterised by a relatively large volume content of phases.

PL

W pracy przedstawiono wpływ warunków eksploatacji wysokostopowego staliwa niklowo-chromowego przeznaczonego do pracy w instalacjach reformingu parowego na morfologię oraz ilość faz występujących w materiale rur odlewanych odśrodkowo. Do identyfikacji struktury wykorzystano metody mikroskopii świetlnej i skaningowej. Ponadto w trzech temperaturach badań (20, 820 i 945°) określono własności mechaniczne staliwa po eksploatacji w warunkach przemysłowych. Wyznaczono związek pomiędzy ilością faz (węglików pierwotnych i wtórnych), określona przy wykorzystaniu metody metalografii ilościowej, a umowną granicą plastyczności badanego materiału.

Słowa kluczowe

EN

steam reforming; alloyed cast steel; primary and secondary carbides; volume content of phases; mechanical properties

PL

reforming parowy; staliwo stopowe; węgliki pierwotne i wtórne; właściwości mechaniczne

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2013
• Tom: Vol. 58, iss. 3
• Strony: 785--790
• Opis fizyczny: Bibliogr. 14 poz., rys., tab.

Twórcy

autor

Mikułowski B.

• AGH University of Science and Technology Department of Metallic Materials and Nanoengineering, Faculty of Non-Ferrous Metals, al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Zapała R.

• AGH University of Science and Technology Department of Cast Alloys and Composites Engineering, Faculty of Foundry Engineering, Reymonta St. 23, 30-059 Kraków, Poland

autor

Głownia J.

• AGH University of Science and Technology Department of Cast Alloys and Composites Engineering, Faculty of Foundry Engineering, Reymonta St. 23, 30-059 Kraków, Poland

autor

Wilk P.

• AGH University of Science and Technology Department of Metallic Materials and Nanoengineering, Faculty of Non-Ferrous Metals, al. A. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

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• [8] B. Mikułowski, Metallographic and mechanical studies of catalytic tubes at ambient temperature and the operating temperature (12ANC40 cast steel). Study made by ZA Chorzów on request of ZA Puławy, (1995). Unpublished.
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