The choice between SUS 316 and 316L hinges primarily on carbon content and its effect on high-temperature performance. SUS 316 contains up to 0.08% carbon, while 316L is capped at 0.03%. This difference becomes decisive in elevated-temperature applications.
At 600–870°C, SUS 316 exhibits higher creep strength than 316L. Research confirms that the short- and long-term high-temperature strength of Type 316 is slightly superior to Type 316L, attributed to the solid solution hardening effect of carbon and more uniform distributions of fine carbide and σ-phase in the austenite matrix. This makes SUS 316 suitable for high-temperature stress-bearing components such as thermal power plant steam pipelines and high-temperature chemical processing equipment.
However, SUS 316's higher carbon content introduces a trade-off: it is more susceptible to sensitization and intergranular corrosion after welding. 316L, with its low carbon content, offers superior intergranular corrosion resistance and does not require post-weld heat treatment. The recommendation is straightforward: choose SUS 316 when the component operates continuously at 600–870°C under load, particularly in steam or thermal processing service. Select 316L instead when the application involves extensive welding, operates in corrosive chloride-bearing environments, or requires optimal corrosion resistance without post-weld heat treatment. In essence, SUS 316 is the high-temperature workhorse; 316L is the corrosion-resistant welder's choice.
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