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Residual life of repair welded joints in pipelines made of 13HMF after use for the design operating time

Jasiński A., Zieliński A., Purzyńska H.

Prace Instytutu Metalurgii Żelaza

2018

T. 70, nr 3

2--10

This paper presents the results of material tests of repair welded joints carried out for samples of materials taken from high pressure steam pipelines after over 200,000 operating hours in creep conditions, made of the 13HMF steel (14MoV6-3). The aim of the study was to assess the mechanical properties and changes in the structure of repair welded joints (new material + material after use), including the original material, heat affected zone and the weld, occurring as a result of the welding process and heat treatment after welding.

W niniejszym opracowaniu zaprezentowano wyniki badań materiałowych przykładowych naprawczych złączy spawanych wykonanych na próbkach materiałów pobranych z rurociągów pary wysokoprężnej po przepracowaniu 200 tysięcy godzin pracy w warunkach pełzania, wykonanych ze stali 13HMF (14MoV6-3). Celem badań była ocena właściwości mechanicznych oraz zmian struktury naprawczych złączy spawanych (materiał nowy + materiał po eksploatacji) obejmujących materiał rodzimy, strefę wpływu ciepła i spoinę, zachodzących na skutek procesu spawania i przeprowadzonej obróbki cieplnej po spawaniu.

The evaluation of suitability for operation of repair low-alloy steel welded joints

Dziuba-Kałuża M., Zieliński A., Jasiński A., Sroka M., Dobrzański J., Linek T.

Archives of Materials Science and Engineering

2016

Vol. 78, nr 2

78--86

Purpose: The purpose of the work was to evaluate the material condition of repair welded joints of steam pipelines with regard to their suitability for operation including determination of the time of their further safe operation. Design/methodology/approach: The following was carried out: microstructure investigations using scanning electron microscopy, investigations on mechanical properties at room and elevated temperatures, determination of the fracture appearance transition temperature based on impact tests. The abridged creep tests without measurement of elongation during test were carried out to determine the material’s residual life. Findings: The time of safe operation was determined for welded joints made in 14MoV63 steel after long-term service and 14MoV63 steel after long-term service and in the as-received condition. Practical implications: The applied methodology and the adopted procedures are used in evaluating the condition and forecasting further operation of new repair welded joints for the pressure part components of power equipment working under creep conditions. Originality/value: The obtained results of investigations will be the elements of materials characteristics worked out by the Institute for Ferrous Metallurgy for the steels and welded joints made in them to work under creep conditions.