Bainitic steels and alloys for power plant

Chapter title: Bainitic steels and alloys for power plant
Author: Mathew Peet
In the book: Structural Alloys for Power Plants, Operational Challenges and High-temperature Materials
Editors: Amir Shirzadi and Susan Jackson
Publisher: Woodhead Publishing Series in Energy: Number 45, 2014
Chapter DOI: 10.1533/9780857097552.2.153
ISBN: 978-0-85709-238-0


This chapter concerns bainitic steels for power plant based on low-carbon, low-alloy steels. The various transformations in steel - particularly bainitic transformations - are explained beginning with elementary principles. Power plant steels are usually used in the severely tempered condition. The structure approaches equilibrium on tempering and in service with a corresponding reduction in the driving force for further transformation. The effect of tempering upon mechanical properties has been represented by combining the Ashby-Orowan and Hall-Petch equations. The effect of compostiion on the tempering process is outlined. Examination of desirable properties highlights the predominance of creep strength and microstructural stability. Strategies to develop these steels are summarised, including the introduction of reduced activation steels and super clean steels.

Key words

Bainite, severe tempering, ferritic steels, creep, toughness, remnant life, CrMoV steels, NiCrMoV steels, microstructural stability, precipitation strengthening, rotor steels.