DUPLEX STAINLESS STEEL, AND DUPLEX STAINLESS STEEL STRUCTURE, MARINE STRUCTURE, PETROLEUM/GAS ENVIRONMENT STRUCTURE, PUMP IMPELLER, PUMP CASING, AND FLOW ADJUSTMENT VALVE BODY USING SAME

摘要

This duplex stainless steel is characterized in comprising, in mass%, N: 0.3% or less, C: 0.1% or less, P: 0.1% or less, Si: 3.0% or less, Mn: 8.0% or less, Ni: 3.0-12.0%, Cr: 20.0-40.0%, Mo: 7.0% or less, W: 6.5% or less, and Ta: 0.05-1.0%, with the remainder being Fe and unavoidable impurities. The formation of tantalum nitride can thereby be limited.