The target to increase the steam parameters, temperature and pressure, in the new power generation plants for reduction of CO2 emission generated the development of enhanced high Chromium steels with improved creep behaviours and stability at service temperature.After several years of research activities in Europe currently the composition Rotor E, developed in the frame of COST programs (501, 522 and 536), become a commercial product.This forged steel is mainly produced by remelting of ingot by Electro Slag Remelting (ESR), but this paper demonstrate that also the conventional route, without ESR, can be also used to produce successfully large rotor components using tailored process control of the production steps.This paper describes the current production of Società delle Fucine for Rotor E steel grade by conventional process route, based on ladle furnace and vacuum degassing, and the mechanical and creep behaviours of the forged products.Società delle Fucine (SdF) produced also a FB2 prototype rotor using a conventional process route. In fact in the COST 522 the best candidate, coded FB2 — a 10%Cr steel with additions of Co and B, without W — was selected for scale-up from laboratory trial to full industrial component. In fact the addition of Boron was successfully adopted to increase the stability of the microstructure and as consequence to improve the creep behaviour of the new enhanced martensitic steels.Also the update of the long term characterization program of trial rotor made by FB2 steel grade will be also presented.
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- Experience in Manufacture and Behaviours of High Chromium Forged Rotor Steels
A. Di Gianfrancesco
- Springer International Publishing