Nickel is a very important material, yet the resources are deficient. 08Cr19Ni10 (S30408) steel is expensive with containing 8% (mass fraction) nickel and has a low strength, while low nickel austenitic stainless steel has poor corrosion resistance property.In order to save nickel resources, the strength of austenitic stainless steel was improved by partly replacing Ni with Mn and N on the basis of ensuring that the corrosion is as well as S30408, 08Cr19Mn6Ni3Cu2N (QN1803) high strength nitrogen alloyed low nickel austenitic stainless steel was designed by Thermo-Calc software in place of S30408 steel. Microstructures, mechanical and corrosion resistant properties of QN1803 steel were investigated by means of OM, SEM, electrochemistry workstation and other methods. The results reveal the grain size of QN1803 steel is smaller than that of S30408, and difference of average grain size is increased from 1.8 μm to 16.27 μm with temperature rising from 1040 ℃ to 1120 ℃. Yield strength of QN1803 steel is increased to more than 400 MPa, and is 1.3 times than that of S30408 steel for nitrogen playing a role of grains refining and solution reinforcing. The impact energy of QN1803 steel is significantly lower than that of S30408 steel for nitrogen atoms reducing low temperature toughness of nitrogen alloyed austenitic stainless steel below -60 ℃. After 600~900 ℃ temperature ageing, chromium-rich carbide_{particles first occur in grain boundaries, nose temperature of precipitation phase is 800 ℃; the inter-granular corrosion of QN1803 steel need more ageing time than S30408 steel, because nitrogen atoms can impede nucleation and growth of carbides, inter-granular corrosion of QN1803 steel is occured with double ageing time of S30408 steel at ageing temperature 700 ℃. Compared with S30408 steel, the passivation film depth of QN1803 steel has higher content of nitrogen and chromium; QN1803 steel has similar pitting corrosion rate (4.72 g/(m²·h)) and more stable austenitic microstructure and higher corrosion potential (327 mV); the pitting resistance of QN1803 steel is 1.15 times than that of S30408 steel with 60% cold reduction, and products have lower risk of stress cracking than S30408 steel. Due to addition of 1.65%Cu element improving corrosion resistance capability in dilute sulfuric acid solution, the surface of QN1803 steel can be enriched with a layer of copper-rich film protecting substrate, as a result, its corrosion resistance reaches 6.6 times than that of S30408 steel in 5% dilute sulfuric acid solution.}