A method for producing duplex stainless steel seamless pipe comprising the steps of: applying, onto the billet's surface, a lubricant composition for hot metal working which contains: an inorganic component as a first component; sodium hydroxide as a second component; water-soluble resins and/or water-soluble surfactants as a third component; and water, wherein said lubricant composition for hot metal working, to a total mass of said first component, said second component, and said third component as 100 mass %, contains: 96.5 mass % or more and 99.98 mass % or less of said first component; 0.01 mass % or more and 0.5 mass % or less of said second component; and 0.01 mass % or more and 1.5 mass % or less of said third component, wherein said inorganic component is one or in combination of two or more selected from the group consisting of: Al 2 O 3, SiO 2, CaO, B 2 O 3, K 2 O, and Na 2 O, heating a billet in a heating furnace; wherein, during the step of heating, said billet is heated in the heating furnace for 1.5 hours or more and 4.0 hours or less at 1250°C or more and 1320°C or less while regulating the average concentration of sulfur dioxide gas in the atmosphere within the furnace to 0.01 volume % or less, and thereafter, performing hot metal working of said billet; wherein the duplex stainless steel for said seamless pipe comprising said billet containing: in mass %, C: 0.03% or less, Si: 0.1 to 2%, Mn: 0.1 to 2%, P: 0.05% or less, S: 0.008% or less, Al: 0.1% or less, Ni: 5 to 11%, Cr: 17 to 30%, Mo: 1 to 6%, N: 0.1 to 0.4%, Ca: 0 to 0.02%, Mg: 0 to 0.02%, REM: 0 to 0.2%, B: 0 to 0.05%, Cu: 0 to 2%, V: 0 to 1.5%, Ti: 0 to 0.5%, and Nb: 0 to 0.5%; and a residue Fe as well as inevitable impurity; wherein said billet further contains, in mass %, over 1.5% and 5% or less of W. applying, onto the billet's surface, a lubricant composition for hot metal working which contains: an inorganic component as a first component; sodium hydroxide as a second component; water-soluble resins and/or water-soluble surfactants as a third component; and water, wherein said lubricant composition for hot metal working, to a total mass of said first component, said second component, and said third component as 100 mass %, contains: 96.5 mass % or more and 99.98 mass % or less of said first component; 0.01 mass % or more and 0.5 mass % or less of said second component; and 0.01 mass % or more and 1.5 mass % or less of said third component, wherein said inorganic component is one or in combination of two or more selected from the group consisting of: Al 2 O 3, SiO 2, CaO, B 2 O 3, K 2 O, and Na 2 O, heating a billet in a heating furnace; wherein, during the step of heating, said billet is heated in the heating furnace for 1.5 hours or more and 4.0 hours or less at 1250°C or more and 1320°C or less while regulating the average concentration of sulfur dioxide gas in the atmosphere within the furnace to 0.01 volume % or less, and thereafter, performing hot metal working of said billet; wherein the duplex stainless steel for said seamless pipe comprising said billet containing: in mass %, C: 0.03% or less, Si: 0.1 to 2%, Mn: 0.1 to 2%, P: 0.05% or less, S: 0.008% or less, Al: 0.1% or less, Ni: 5 to 11%, Cr: 17 to 30%, Mo: 1 to 6%, N: 0.1 to 0.4%, Ca: 0 to 0.02%, Mg: 0 to 0.02%, REM: 0 to 0.2%, B: 0 to 0.05%, Cu: 0 to 2%, V: 0 to 1.5%, Ti: 0 to 0.5%, and Nb: 0 to 0.5%; and a residue Fe as well as inevitable impurity; wherein said billet further contains, in mass %, over 1.5% and 5% or less of W. Al 2 O 3, SiO 2, CaO, B 2 O 3, K 2 O, and Na 2 O, heating a billet in a heating furnace; wherein, during the step of heating, said billet is heated in the heating furnace for 1.5 hours or more and 4.0 hours or less at 1250°C or more and 1320°C or less while regulating the average concentration of sulfur dioxide gas in the atmosphere within the furnace to 0.01 volume % or less, and thereafter, performing hot metal working of said billet; wherein the duplex stainless steel for said seamless pipe comprising said billet containing: in mass %, C: 0.03% or less, Si: 0.1 to 2%, Mn: 0.1 to 2%, P: 0.05% or less, S: 0.008% or less, Al: 0.1% or less, Ni: 5 to 11%, Cr: 17 to 30%, Mo: 1 to 6%, N: 0.1 to 0.4%, Ca: 0 to 0.02%, Mg: 0 to 0.02%, REM: 0 to 0.2%, B: 0 to 0.05%, Cu: 0 to 2%, V: 0 to 1.5%, Ti: 0 to 0.5%, and Nb: 0 to 0.5%; and a residue Fe as well as inevitable impurity; wherein said billet further contains, in mass %, over 1.5% and 5% or less of W.