The difference between 317L stainless steel and 317 stainless steel can be summarized as follows:
Chemical Composition:
317L Stainless Steel: It is a low carbon version of 317 stainless steel, containing an extra-low amount of carbon. The carbon content in 317L is typically less than 0.03%, which helps to minimize the formation of carbide precipitation during welding, reducing the risk of sensitization and intergranular corrosion.
317 Stainless Steel: It contains a higher carbon content compared to 317L, typically ranging from 0.04% to 0.10%. The higher carbon content may make it more prone to sensitization and intergranular corrosion in certain conditions.
Corrosion Resistance:
317L Stainless Steel: It offers superior corrosion resistance compared to 317 stainless steel, especially in acidic and corrosive environments. The addition of molybdenum enhances its resistance to pitting and crevice corrosion, making it suitable for applications involving exposure to chloride-containing solutions.
317 Stainless Steel: While it also provides good corrosion resistance, it may be slightly less resistant to corrosion compared to 317L stainless steel, particularly in chloride-rich environments.
Weldability:
317L Stainless Steel: Due to its low carbon content, 317L stainless steel demonstrates improved weldability compared to 317 stainless steel. The reduced carbon content helps to prevent carbide precipitation and subsequent sensitization during welding, contributing to better resistance against intergranular corrosion.
317 Stainless Steel: The higher carbon content in 317 stainless steel can make it more susceptible to sensitization and intergranular corrosion during welding, requiring careful control of welding parameters and post-weld heat treatment.