CrMo – P91

RECENT DEVELOPMENTS IN WELDING CONSUMABLES FOR P(T)-91 CREEP RESISTING STEELS.

This paper was presented at International Conference on Integrity of High Temperature
Welds (Co-ordinated by The Institute of Materials and the Institution of Mechanical
Engineers), 3-4 November 1998, Nottingham, UK.

Synopsis
Weld metals for type 91 steels are now readily available and consumables/process
combinations can be utilised to give compositions and hence microstructures which are
optimised for long term creep performance. This paper reviews the compositional
requirements for type 91 consumables in the light of requirements for long term performance,
ambient temperature toughness and currently available specifications. In particular, it
describes the latest development and performance of a range of welding consumables
designed for the SMAW, GMAW, GTAW and SAW processes, and provides some insight
into the welding consumables for the next generation of steels for high temperature service.