Duplex stainless steel seamless pipes - Duplex stainless steel seamless pipes

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GB/T21833.1-2020	Austenitic-ferritic duplex stainless steel seamless pipes
GB/T21833.2-2020	Austenitic-ferritic duplex stainless steel seamless pipes

ASTM A789(ASMESa789)	Seamless and welded ferritic/austenitic stainless steel pipes for general purposes
ASTM A790(ASME Sa790)	Seamless and welded ferritic/austenitic stainless steel nominal pipes