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At present, the chemical elements known to have 100 kinds of chemical elements, can be encountered in the industry are commonly used in iron and steel materials in about 20 species. For the practice of people in the long struggle with the corrosion phenomena and the formation of the special steel stainless steel series, the most common elements have a dozen, besides the basic elements of the steel and iron, on structure and property of stainless steel is the greatest impact elements: carbon, chromium, nickel, manganese, silicon, molybdenum, titanium niobium, titanium, manganese, cobalt, copper, nitrogen, etc.. These elements in addition to carbon, silicon, nitrogen, are chemical elements in the periodic table of the elements in the transition.
In fact, the industrial application of the stainless steel is there even a dozen several elements, when several elements coexist in the stainless steel which a unity, their impact is much more complex than when present alone, because in this case should not only consider the various elements of their role, but also pay attention to their influence each other the stainless steel, so the organization decided to sum to the effects of various elements.
1). Effects of microstructure and properties of various elements on the stainless steel and the role of
The decision function of chromium in stainless steel: the decision of the elements of stainless steel belongs to only one, that is each kind of stainless steel chromium, all contain a certain amount of chromium. So far, no no chromium stainless steel. Chromium makes the main elements determine the performance of stainless steel, the basic reason is that after adding chromium to steel as the alloy elements, promote its internal contradiction movement is conducive to resist corrosion damage of the development. This change can be explained from the following aspects:
The electrode potential of Cr to Fe based solid solution to improve
The absorption of chromium iron makes iron passivated electronic
Passivation is due to anodic reaction is blocked and cause of metal and alloy corrosion resistant performance is improved phenomenon. Consisting of a metal and alloy passivation film on a lot of theories, mainly deals with the electronic arrangement theory, adsorption.