MarBN steels are the most promising approach to increasing the temperature capability of creep resistant martensitic steels to above 620°C and has showed significant improvements in creep strength (20-40%) compared to the current state-of-the-art steels, Grade 92 and CB2.
The aim of INMAP was to upscale and demonstrate the manufacturability of industrial components and develop / validate the casting technology and NDT inspection procedures required to produce a demonstration component. Goodwin subsequently manufactured an 8,640KG net weight steam turbine chest that was fully assessed by UT+RT and characterised through extensive mechanical tests including creep and low cycle fatigue (LCF).
The INMAP project Achievements:
- Manufacture of a MarBN (IBN-1) steam chest of industrial size, thereby qualifying the casting process for a practical industrial component with complicated geometry.
- Development of innovative technology to improve the defect detectability for industrial components manufactured in IBN-1 steels.
- Development of welding repair solutions for large cast components in IBN-1 steel.
- Confirmation of the IBN-1 material advantage previously demonstrated in in the IMPACT project.