Changes in Steam Pipeline Properties after Long-term Exposure

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44555601%3A13420%2F20%3A43896045" target="_blank" >RIV/44555601:13420/20:43896045 - isvavai.cz</a>

Result on the web

<a href="https://www.journalmt.com/artkey/mft-202004-0009_changes-in-steam-pipeline-properties-after-long-term-exposure.php" target="_blank" >https://www.journalmt.com/artkey/mft-202004-0009_changes-in-steam-pipeline-properties-after-long-term-exposure.php</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.21062/mft.2020.104" target="_blank" >10.21062/mft.2020.104</a>

Result language

angličtina

Original language name

Changes in Steam Pipeline Properties after Long-term Exposure

Original language description

Steam pipeline steels are stressed for a long time at higher temperatures and elevated pressure. Their operating con-ditions are not constant due to various operating factors, for example, there are changes in temperature and pressure conditions during unavailability time. Long-term thermal exposure of these steels for steam pipelines, such as 15 128 (K11591) steel, leads to degradation processes associated with structural changes and changes in mechanical proper-ties. Structural changes are related to the reduction of free energy of the steel system [2]-[9]. During structural changes, the original ferritic-pearlite structure with lamellar pearlite and the presence of carbides inside ferritic grains changes. As a result of the reduction of the free energy, the lamellar cementite gains globulitic character and the carbide particles move to the ferritic grain boundaries, thereby occurs to the weakening the grain boundaries. In the consequence of the structural changes, there are the changes of mechanical properties. Extremely sensitive, in terms of mechanical proper-ties, to structural changes, is the resistance of steel to failure characterized by impact resistance. The transit curve de-termined by this method shifts to the right towards higher temperatures relative to the initial (primary) state of the steel, thereby the steel can, in extreme cases, to get brittle already at room temperature. This can have catastrophic con-sequences when pressurizing the pipeline after an unavailability time. The contribution presents the results of structural and fractographic analyzes and impacts strength values of steam pipeline of steel 15 128 after long-term exposure - 186.728 hours.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Manufacturing Technology

ISSN

1213-2489

e-ISSN

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Volume of the periodical

20

Issue of the periodical within the volume

4

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

4

Pages from-to

534-537

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85098716348