| Abstract Scope |
Cr-Mo based high-alloyed steel tubes are used widely as structural materials in the chemical, petrochemical, marine, construction, and nuclear industrial fields due to their attractive combination of superior mechanical properties and high corrosion resistance. However, manufacturing processes, particularly welding involving rapid heating and cooling, can create an inhomogeneous microstructure and harmful 2nd phase particles that degrade their properties. To mitigate this, annealing with several gases can be applied. However, the surface and corrosion characteristics can vary significantly depending on the gas composition used during annealing.
In this study, the authors aim to clarify the influences of reducing atmospheres during annealing on the surface properties of the high-alloyed steel tubes. Moreover, we will discuss their corrosion behaviors with respect to the phase transitions on their outer surface. This work will provide insights into the mechanisms behind the relationship between the surface modifications during the annealing process and the corrosion behaviors. |