Patent ID: 9663850
Date: 2017-05-30
CPC Classifications: C21D,C22C

Claim:
1. Duplex stainless steels with ferrite-austenite phases, comprising 16.5-19.5 wt. % of chromium (Cr), 2.5-3.5 wt. % of molybdenum (Mo), 2.1-5.5 wt. % of tungsten (W), 5.5-7.0 wt. % of manganese (Mn), 0.35-0.45 wt. % of nitrogen (N), 0.01 to 0.7 wt. % of nickel (Ni), with a remainder of iron (Fe) and unavoidable impurities including 0.03 wt. % or less of carbon (C) and 0.5 wt. % or less of silicon (Si).