Grade P91 is a new ferritic alloy heat resistant steel developed based on grade P9 steel through the process of pure purification, fine crystallization metallurgy, microalloying and controlled rolling. The steel has good comprehensive mechanical properties, good welding properties and good process properties, suitable for high-temperature compression parts of the material.

WIHO metals is a leading seamless steel tube supplier and manufacturer, we supply ASTM A335 Grade P91 and ASME SA P91 alloy steel pipe and their equivalent material for boiler systems in various sizes and specifications.

ASTM A335 P91 and ASTM A213 T91

Grade T91 specified in ASTM A213 which do Ferrite and Austenitic boiler superheater and heat exchanger seamless steel tube while grade P91 specified in ASTM A335 do Ferritic and alloy seamless steel tube intended for high-temperature service. Grade T91 and P91 steel pipe have a similar chemical composition and mechanical properties. As for their difference, we can say that they have been substituted for another one when the same purpose.

ASTM A335 P91 Tubing Equivalent Material

ASTM A335 P91 Chemical Composition

ASTM A335 P91 Mechanical Properties

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