Is there a difference in corrosion resistance between low-carbon and ultra-low-carbon austenitic stainless steels?

This post was last edited by Wang Genrong on 2017-9-1 at 14:38. The impact of carbon content on the properties of stainless steel: When manufacturing industrial steels such as stainless steel round bars and stainless steel flat bars, carbon is one of the key elements used. The carbon content and its distribution greatly determine the properties and microstructure of stainless steel, as can be seen from the following two points: 1. Carbon is an element that stabilizes austenite, and its effect is quite significant, being approximately 30 times that of nickel； 2. Due to the strong affinity between carbon and chromium, a series of complex carbides can be formed with chromium. Therefore, in terms of both strength and corrosion resistance, the role of carbon in stainless steel is contradictory; we can choose stainless steel products with different carbon contents based on various application requirements. For example, the most widely used and basic type of stainless steel in industry is 0Crl3–4Cr13; the standard chromium content for these five grades is specified at 12–14%, a value determined after taking into account the formation of chromium carbide as a result of the combination of carbon and chromium. For these five steel grades, their strength and corrosion resistance vary due to differences in carbon content: 0Cr13–2Crl3 steel has good corrosion resistance but lower strength compared to 3Crl3 and 4Cr13 steel; it is often used for manufacturing structural components. The latter two grades, having a higher carbon content, exhibit high strength and are thus used for producing springs, cutting tools, and other parts that require high strength and wear resistance ； For example, to overcome intergranular corrosion in 18-8 chromium-nickel stainless steel, the carbon content of the steel can be reduced to below 0.03%, or elements with a greater affinity for chromium and carbon (such as titanium or niobium) can be added to prevent the formation of chromium carbides ； For example, when high hardness and wear resistance are the primary requirements, we can increase the carbon content of the steel while also raising the chromium content appropriately, thereby meeting the needs for hardness and wear resistance while also ensuring a certain level of corrosion resistance. In general, the carbon content of stainless steels used in industry today is relatively low; most stainless steels have a carbon content between 0.1% and 0.4%, while acid-resistant steels usually have a carbon content of 0.1% to 0.2%. Stainless steels with a carbon content of more than 0.4% account for only a small portion of all steel grades, as in most application conditions, stainless steels are designed primarily for their corrosion resistance. Furthermore, Huaxiang Metal believes that a lower carbon content is also necessary due to certain process requirements, such as ease of welding and cold deformation.

Low-carbon stainless steel has a greater resistance to intergranular corrosion, and its austenitic structure is more easily maintained after heating.

Ultra-low carbon austenitic stainless steels exhibit better resistance to intergranular corrosion, and their resistance to sensitization during heat treatment in the container manufacturing process is much greater than that of ordinary austenitic stainless steels.

Can some of the connectors inside the calcium-based desulfurization tower be made of 316 stainless steel?