[MW:20891] Difference between P-91 and Stainless Steel (Austenitic Stainless Steel)

 What are the fundamental difference between P-91 and Austenitic Stainless Steel in terms of the following

i. Weld Corrosion

ii. Heat Input requirement 

iii. Weldability

iv. Coefficient of Heat Expansion 

v. Reponse in terms of High temperature Service

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