Chrome-nickel austenitic steels, the advantages of a lot, but increasingly in recent decades due to the nickel base alloy containing 20% nickel, development and application of the hot strength of steel, and chemical industry is the growing requirements for stainless steelthe greater the amount of nickel deposits is less and because they are concentrated in a few areas worldwide nickel supply and demand contradictions. In stainless steel and other alloy areas (such as large steel castings and forgings, tool steel, heat-strength steel, etc.), especially the lack of national resources of nickel, to carry out the section of nickel and other elements on behalf of nickel science research and production practice, more research and application in this regard is based on manganese and nitrogen to replace the nickel in stainless steel and heat-resistant steel.
The role of manganese austenite and nickel. But to put the precise role of manganese is the formation of austenite, but rather it reduces the critical quenching speed steel, increase the stability of the austenite in the cooling, inhibit the decomposition of austenite, formed under high temperature austenite is maintained at room temperature. Improve the corrosion resistance of steel in terms of the role of manganese such as manganese content in the steel changes from 0 to 10.4%, do not make steel in air and acid corrosion resistance changed obviously. This is because the little manganese electrode potential of improving the iron-based solid solution, the protective effect of the oxide film formed is very low, industrial Although manganese alloyed austenitic steels (such as 40Mn18Cr4 50Mn18Cr4WN of ZGMn13 steel etc.), but they can not use as stainless steel. Half, the extent of 2% of the nitrogen in steel is stable austenite, and the role of manganese in the steel the role of stable austenite is about nickel is bigger than the nickel. For example, purports to contain 18% chromium steel at room temperature for austenitic manganese and nitrogen on behalf of low-nickel stainless steel, nickel, and the element nickel chromium manganese nitrogen induced steel, has applications in industry, and some has successfully replaced the classic 18-8 chrome-nickel stainless steel.
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