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.