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See Chinese contents: NB/T 47019.6-2011 NB/T 47019.6-2011: Purchase technical specification for boiler and heater exchanger tubes/pipes. Part 6: Ferrite/austenite duplex steel
This part specifies the designation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate requirements for the ferrite/austenite duplex seamless steel tube used for heater exchanger.
