When it comes to choosing the right grade of stainless steel for industrial use, understanding the differences between various grades is very important. Stainless Steel 317/317L Round Bars & Wires are commonly used in many industries because of their strength, corrosion resistance, and durability. However, there are some key differences between SS 317 round bars and SS 317L round bars that make them suitable for different applications.
Overview of Stainless Steel 317 and 317L
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SS 317 round bars are made from a high-alloy austenitic stainless steel. They contain more molybdenum compared to 316, which gives them better resistance to chemical attacks and pitting in chloride environments.
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SS 317L round bars are the low-carbon version of SS 317. The “L” stands for low carbon, which reduces carbide precipitation during welding and improves resistance to intergranular corrosion.
Both these grades are also available in wires, which are widely used in weaving mesh, spring making, and welding applications.
Key Differences Between SS 317 and SS 317L
1. Carbon Content
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SS 317 round bars have a higher carbon content compared to SS 317L.
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SS 317L round bars have a maximum carbon content of 0.03%, which makes them better for welding and applications where corrosion resistance at weld joints is critical.
2. Corrosion Resistance
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Both grades have excellent resistance to general corrosion, but SS 317L round bars offer better resistance to intergranular corrosion after welding because of the lower carbon content.
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SS 317 round bars still provide high resistance to chemical attacks, but they are not as resistant as 317L in welded conditions.
3. Mechanical Strength
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SS 317 round bars generally have slightly higher tensile and yield strength due to the higher carbon content.
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SS 317L round bars may have slightly lower strength, but they provide better ductility and toughness, especially in welded structures.
4. Welding Properties
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SS 317L round bars are preferred in welding applications because the lower carbon content minimizes the risk of carbide precipitation.
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SS 317 round bars can also be welded, but there is a higher chance of corrosion at the weld joints unless post-weld treatment is done.
5. Applications
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SS 317 round bars are often used in chemical processing equipment, pulp and paper industries, and textile plants where higher strength is required.
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SS 317L round bars are more suitable for welded structures, marine environments, and industries dealing with corrosive chemicals.
Applications of Stainless Steel 317/317L Round Bars & Wires
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Heat exchangers and condensers
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Chemical processing equipment
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Food and beverage industry machinery
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Marine applications
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Springs, mesh, and fasteners made from wires
Conclusion
Both are excellent choices for industrial use. The main difference lies in the carbon content, which affects corrosion resistance and welding performance. If high strength is required, SS 317 round bars are a good option. If welding and corrosion resistance at the joints are the priority, SS 317L round bars are the better choice.
