Describe the stainless steel used in urea plant, its weight percentage is C: 0.03% or less, under the condition of 0.5%.Mn: 2% or less, p.0.04% or less, s.003% or less, Cr: 26% or more, but less than 28%.It's not six percentMo: 0.2-1.7%,W: More than 2%But not more than 3%N: More than 0.3%But not more than 0.4%the rest being Fe and impurities, in which the content of Cu as impurity is not greater than 0.3%. Duplex stainless steel may also contain Ca, Ce, and B, with the content levels of Al and O as impurity not being greater than 0.05% and 0.01%, respectively. Furthermore, it is preferable that the increase in the Vickers hardness of the steel is not greater than 80, before and after the steel treated with solution annealing is subjected to a heat treatment of 800 ° C for 30 minutes and subsequent cooling in water. This duplex stainless steel has high resistance to corrosion.
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