The present invention relates to high-nitrogen duplex stainless steels with an excellent eco-index and pitting corrosion resistance, in particular, to providing duplex stainless steels with ferrite-austenite phases, comprising:16.5-19.5 wt.% of chromium (Cr), 2.3-3.5 wt.% of molybdenum (Mo), 1.0-5.5 wt.% of tungsten (W), 5.5-7.0 wt.% of manganese (Mn), 0.35-0.45 wt.% of nitrogen (N), with a remainder of iron (Fe). The high nitrogen duplex stainless steels with excellent eco-index and pitting corrosion resistance according to the present invention use manganese (Mn) and nitrogen (N) to exclude or mostly substitute Ni, which increases price instability of the steel grades and environment burden, to result in enhancing economic efficiency, price stability and eco-friendliness.
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