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Relationships between Microstructural Parameters and Properties of 15NiCuMoNb5 Grade Steel Used for Special Industry Applications

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Abstract:

This article is focused on optimization of fundamental utility properties and technological process of advanced low alloy steel 15NiCuMoNb5 used for power engineering mainly for production of large capacity steam boilers. Consequently problem critical locality in weld after post weld heat treatment is studied. Optimization of welding technology is proposed. Fracture behaviour of welded joint made from boiler plates 80 mm in thickness of 15NiCuMoNb5 type steel after N + T PWHT regime after welding procedure were studied. Stable crack growth measurement and evaluation of fracture toughness of base material as well as weld metal in temperature region from 0 up 350°C were carried out. Unstable cleavage fracture and fracture toughness KJc of both parts of welded joint at test temperatures cover the transition region were evaluated. The reference temperature T0 approach was used for evaluation of temperature dependence of fracture toughness in transition range.

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Periodical:

Materials Science Forum (Volumes 567-568)

Pages:

381-384

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.567-568.381

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Online since:

December 2007

Authors:

Ladislav Kander, Karel Matocha, Jaromír Sobotka

Keywords:

15NiCuMoNb5 Grade Steel, Fracture Toughness, R-Curves, Reference Temperature To, Steam Boiler, Weld Joint

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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References

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[2] Kander L., Sobotka,J., Matocha,K.: Fracture behaviour assessment of weldf joint of thick plates from low-alloy creep resistant steel of 15NiCuMoNb5 type. Zvaranie-Svarovani, 52, 11- 12/2003, s. 233.

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[5] ASTM E 1921 Standard Test Method for Determination of Reference Temperature T0 for Ferritic Steel in the Transition Range.

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