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Weldability
AISI 316L is a low-carbon variant of AISI 316; the significantly reduced carbon content lowers the risk of carbide precipitation and thus improves weldability. Its excellent weldability makes it ideal where high corrosion resistance at welds is required. Typically no pre-treatment or post-weld heat treatment is necessary, and it can generally be welded with standard welding processes.
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Machinability
The machinability of AISI 316L is rated as moderate. It generally resembles AISI 316 but is slightly improved due to the lower carbon content. Using carbide tooling and cutting fluids significantly enhances the machining process.
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Forgeability
The material's forgeability is overall good. Preheating is performed slowly to about 1150–1200°C, then forging is carried out between 900–1180°C. After forging, rapid cooling—by water or air—is applied to minimize stresses and optimize corrosion resistance. Scale or heat tint produced during forging can impair corrosion resistance; removal by chloride-free chemical or mechanical methods is strongly recommended.
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Magnetizability
As with other austenitic stainless steels, AISI 316L is non-magnetic in the annealed condition. Cold working or exposure to very low temperatures can induce slight magnetism, but this usually does not affect typical applications.
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Corrosion resistance
AISI 316L provides excellent corrosion resistance in natural environments and against moderate concentrations of salt or chloride. Good weldability allows maintaining high corrosion resistance across welded areas. Its resistance to intergranular corrosion is largely due to the low carbon content. While it is not permanently seawater-resistant, its overall resistance makes it suitable for many industries, particularly the food sector.
