Duplex stainless steel having improved mechanical strength on and corrosion resistance properties.

摘要

A STAINLESS DOUBLE has a chemical composition consisting essentially on a weight basis, of: C: 0.03% or less, SI: 1.0% or less, MN: 1.5% or less, P: 0.040% or less, S: 0.008% or less, SOL.AL:0,040% OR LESS OR: 5.0-9.0%, CR: 23.0 to 27.0%, MO: 2,04,0%, N: 0.24 to 0.32%, W: more than 1.5% and not more than 1.5%, optionally at least one element selected from CONSISTENT GROUP CU: 0.2-2.0% YV: 0 , from 05 to 1.5% Y / OR GROUP cONSISTENT CA: 0.02% or less, MG: 0.02% or less, B: 0.02% or less, and one or more rare earth metals: 0.2% or less in total, and a balance of Fe and incidental impurities. THE CHEMICAL COMPOSITION IS WORTH AT LEAST 40 TO PREW defined by the following formula (A): PREW = CR + 3.3 (MO + 0.5 W + 16N) where the percentage of each element is by weight. STEEL SAMPLE