Creep deformation and rupture behaviour of boron-added P91 Steel

Creep deformation and rupture behaviour of P91 and boron-added P91BN steels were investigated over the stress range of 100–350 MPa at 823, 873 and 923 K. The time spent in each creep regime was significantly higher in P91BN steel as compared to P91 steel. The reduction in the minimum creep rate in P91BN steel about one to two orders of magnitude was observed than that in the P91 steel. An addition of boron (0.006 wt-%) with controlled nitrogen...