Stainless steel production increased in most countries during 2014
310S heat-resistant steel bar as an important material for aerospace, chemical industry, widely used in high temperature environment. High temperature oxidation is a form of corrosion damage of high temperature of the most common and most important, so the new material with resistance to high temperature oxidation has far-reaching significance of [1] for China’s aviation industry, chemical industry and national defense research and development. 310S austenitic stainless steel (0Cr25N I20) is a high Cr Ni austenitic stainless steel. Effect of nickel in stainless steel with chromium complex is in after the play out.
1. nickel is an excellent corrosion resistant material, is also an important alloying elements in alloy steel. Nickel in steel is austenitic formation elements, but low carbon nickel steel to obtain pure austenite, nickel content to achieve 24%; and only 27% to containing nickel steel corrosion resistance in some medium significantly change. So not a nickel alone stainless steel. But the nickel and chromium also exist in stainless steel, nickel containing stainless steel has a lot of valuable properties.
Based on the above conclusion, nickel alloy elements in as the role of stainless steel, is that it allows high chrome organization changes, so that the stainless steel corrosion resistant performance and process performance obtained certain improvement.
2, manganese and nitrogen can replace chromium nickel stainless steel and nickel
The advantages of Cr Ni austenitic steel although many, but in recent decades due to nickel base alloy and nickel containing 20% following heat resisting steel large development and application, and the chemical industry increasingly development needs more and more on the stainless steel and nickel deposits, less the amount and concentration distribution in the minority area, therefore in the there appeared in the world of contradictions in the supply and the demand aspect of nickel. So in the field of stainless steel and many other alloys (such as large casting and forging steel, tool steel, heat resistant steel and so on), especially lacking nickel resources of the country, to carry out a wide range of nickel and nickel substitute festival to other elements of production practice and scientific research, research in this area and use the more is the manganese and nitrogen to replace stainless steel and heat resistant steel nickel.
3. manganese and nickel austenitic role similar to. But rather, the role of manganese is not the formation of austenite, but in its lower critical steel quenching speed, increase the stability of austenite during cooling, restrain austenite decomposition under high temperature, so that the formation of austenite to maintain the normal temperature. In improving steel corrosion resistance, little effect such as manganese, manganese content in steel containing from 0 to 10.4% change, nor cause steel corrosion resistance in the air and acid obvious change. This is because the little effect to improve the electrode potential of Mn Fe based solid solution, the formation of oxide film of protection is very low, so the industry though with alloying austenitic manganese steel (such as 40Mn18Cr4,50Mn18Cr4WN, ZGMn13 steel etc.), but they cannot be used as stainless steel. Manganese austenitic stability in the role of the steel is about 1/2 that of nickel, 2% of nitrogen in steel is stable Austenitic, and function degree bigger than nickel. For example, in order to make containing 18% chromium steel obtain austenite at room temperature with chromium manganese nitrogen, manganese and nitrogen instead of nickel low nickel stainless steel and nickel stainless steel yuan, at present has been used in the industry, some of which have been successfully replaced the classic 18-8 chrome nickel stainless steel.
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