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The main characteristics of stainless steel
Carbon's effect: carbon is a kind of interstitial element, which increases the strength of austenitic stainless steel significantly through solid solubility.Carbon can also improve the corrosion resistance of austenitic stainless steel in high-concentration chloride (e.g. 42% Mgcl2).But, in the austenitic stainless steel, carbon is often seen as the harmful elements, the mainly reason is the corrosion of stainless steel used in some conditions, such as welding or heating by 450 ~ 850 ℃), carbon steel with chromium in forming high chromium Cr23C6 type carbon compounds which can lead to local chromium depletion, make steel corrosion resistance especially resistant to intergranular corrosion performance degradation.So.Since the 60 s of the development of new cr-ni austenitic stainless steel is mostly carbon content less than 0.03% or 0.02% of the ultra-low carbon type, some experimental pearl also pointed out that the carbon will also increase the chromium austenitic stainless steel corrosion tendency.Due to the harmful effect of carbon, not only in the austenitic stainless steel smelting and shall be controlled according to the requirement as far as possible low carbon content, and later in the hot, cold and heat treatment process is to prevent the stainless steel surface carburization, and free of chromium carbide precipitation.
When the amount of chromium in the steel is no less than 12.5%, the electrode potential of the steel can be mutated, and the negative potential will rise to the positive electrode potential.Prevent electrochemical corrosion.