| abstract |
An object of the present invention is to provide a duplex stainless steel material and a duplex stainless steel tube that exhibit excellent corrosion resistance. A duplex stainless steel material is a duplex stainless steel material composed of a ferrite phase and an austenite phase. The metal component composition of the steel material is V: 0.01 to 0.50 mass%, Ti: 0.00. Containing at least one group X element selected from 0001 to 0.0500 mass%, Nb: 0.0005 to 0.0500 mass%, Ta: 0.01 to 0.50 mass%, The composite inclusion 20 or the composite inclusion 20 and the inclusion 10 is provided, and the inclusion 10 includes at least one of oxide, sulfide, and oxysulfide, and the composite inclusion 20 includes the inclusion. The outer shell 15 of Cr and a carbide or nitride containing at least one kind of the X group element is provided around the nucleus, and the ratio of the number of the composite inclusions 20 is the inclusion. 10 pieces It has a structure at least 30% of. [Selection figure] None |