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In welding P91 materials, at what state that it requires solution annealing?

In welding P91 materials, at what state that it requires solution annealing?

In welding P91 materials, at what state that it requires solution annealing?

(OP)
How solution annealing affect the microstructure of the P91 materials?

RE: In welding P91 materials, at what state that it requires solution annealing?

Solution annealing is really not applicable to creep strength enhanced ferritic steels, like Grade 91. Instead, you perform a normalization heat treatment to provide a 100% martensitic structure for subsequent tempering. The effect of normalization heat treatment is to ensure austenite formation at elevated temperature that can transform on cooling to martensite.

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